Backdoor.Win32.PcClient_6e38c4518c

by malwarelabrobot on May 6th, 2014 in Malware Descriptions.

HEUR:Trojan.Win32.Generic (Kaspersky), Trojan.GenericKD.1650838 (AdAware), Backdoor.Win32.PcClient.FD, Trojan.Win32.Swrort.3.FD, BankerGeneric.YR (Lavasoft MAS)
Behaviour: Banker, Trojan, Backdoor


The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.

Summary
Dynamic Analysis
Static Analysis
Network Activity
Map
Strings from Dumps
Removals

MD5: 6e38c4518c1e1bdbec50520cfbf6ac68
SHA1: cdf17fb1166bc10e46c078a0f29d919e0f1fd7a2
SHA256: 1d53cba1935de008752d2a4bc1bdb6364ab66fca2cd5a216256d7124725e4a58
SSDeep: 24576:2UJndyw/c5zsCZOK06t3WStqe/YLNB3f tV6MbEEO2N K7jHxUuzXSAaEVjjHqe9:tVdywMzJOs3HqhRBWtVb7L7SAvJqe
Size: 1826816 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: MicrosoftVisualC, NETexecutable, UPolyXv05_v6
Company: no certificate found
Created at: 2014-04-22 12:34:46
Analyzed on: WindowsXP SP3 32-bit


Summary:

Backdoor. Malware that enables a remote control of victim's machine.

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

%original file name%.exe:3004
Application DataBnKksxKuKN.exe:4044
netsh.exe:3852

The Backdoor injects its code into the following process(es):

Application DataBsXOeyvQGP.exe:2436
RunDll32.exe:3860
Trojan.exe:3616

File activity

The process Application DataBsXOeyvQGP.exe:2436 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\utt9.tmp.new (63 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004 (18 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab6.tmp (54 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar5.tmp (2712 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004 (408 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015 (408 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\utt1.tmp.new (2 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\i_temp.temp (218 bytes)
%Documents and Settings%\%current user%\Application Data\uTorrent\toolbar_offer.benc (3 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\1GGYBZUQ\impression[1].png (109 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab4.tmp (49 bytes)
%Documents and Settings%\%current user%\Cookies\JO3X9I5E.txt (88 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\SZIS9VJF\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\utt8.tmp (300 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OVYHJBCC\impression[1].png (109 bytes)
%Documents and Settings%\%current user%\Application Data\uTorrent\settings.dat.new (71 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar3.tmp (2712 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\SZIS9VJF\offers[1].json (738 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OVYHJBCC\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\uttA.tmp.new (62 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\idlimage.temp (292 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\SZIS9VJF\dll_optimizerpro_20140210[1].jpg (2526 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\offconfig.temp (3 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-796845957-1563985344-1801674531-1003\1f91d2d17ea675d4c2c3192e241743f9_f3a4e041-90c9-46df-a35a-850a694fae5b (105 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015 (54 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\1GGYBZUQ\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Application Data\uTorrent\toolbar.benc.new (63 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab2.tmp (49 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar7.tmp (2712 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\ADKAppsOfferManager.dll (102 bytes)

The Backdoor deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\Cab4.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar5.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\SZIS9VJF\offers[1].json (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\utt1.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar7.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar3.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\utt1.tmp.26080.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\idlimage.temp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab2.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\uttA.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\uttA.tmp.26145.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab6.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\i_temp.temp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\1GGYBZUQ\impression[1].png (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\offconfig.temp (0 bytes)

The process %original file name%.exe:3004 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Application DataBnKksxKuKN.exe (29 bytes)
%Documents and Settings%\%current user%\Local Settings\Application DataBsXOeyvQGP.exe (9606 bytes)

The process Application DataBnKksxKuKN.exe:4044 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\Trojan.exe (29 bytes)

The process RunDll32.exe:3860 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):

%System%\wbem\Logs\wbemprox.log (42 bytes)

Registry activity

The process Application DataBsXOeyvQGP.exe:2436 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "AD 91 BE A1 D4 CB 02 75 95 54 2C C9 8B 86 A3 6C"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"AutoDetect" = "1"
[HKCU\Software\Classes\FalconBetaAccount]
"remote_access_client_id" = "2961632269"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"History" = "%Documents and Settings%\%current user%\Local Settings\History"

[HKCU\Software\BitTorrent\uTorrent]
"OfferProvider" = ""

[HKCU\Software\BitTorrent]
"computerid" = "6F 00 4A 77 D4 01 41 3D 10 96 D1 00 88 18 5A D2"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "46 00 00 00 41 00 00 00 01 00 00 00 00 00 00 00"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

[HKCU\Software\BitTorrent\uTorrent]
"OfferViaCAU" = "0"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKCU\Software\BitTorrent\uTorrent]
"OfferName" = ""

"OfferAccepted" = "0"

The Backdoor modifies IE settings for security zones to map all web-nodes that bypassing the proxy to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"ProxyBypass" = "1"

The Backdoor modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

"UNCAsIntranet" = "1"

The Backdoor modifies IE settings for security zones to map all urls to the Intranet Zone:

"IntranetName" = "1"

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Backdoor deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"
"ProxyServer"
"ProxyOverride"

The process %original file name%.exe:3004 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "EA 15 BE 17 18 E8 1F C1 EF A1 D0 D5 94 4D 74 23"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Local Settings]
"Application DataBnKksxKuKN.exe" = "Application DataBnKksxKuKN"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f3-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"AutoDetect" = "1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Documents"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Local AppData" = "%Documents and Settings%\%current user%\Local Settings\Application Data"
"Desktop" = "%Documents and Settings%\%current user%\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{773a730e-74fb-11e2-b597-000c293bdf2f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f2-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f5-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Desktop" = "%Documents and Settings%\All Users\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"
"Personal" = "%Documents and Settings%\%current user%\My Documents"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Local Settings]
"Application DataBsXOeyvQGP.exe" = "µTorrent"

The Backdoor modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"UNCAsIntranet" = "1"

The Backdoor modifies IE settings for security zones to map all web-nodes that bypassing the proxy to the Intranet Zone:

"ProxyBypass" = "1"

The Backdoor modifies IE settings for security zones to map all urls to the Intranet Zone:

"IntranetName" = "1"

The process Application DataBnKksxKuKN.exe:4044 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "56 A6 E5 5A 93 B9 C9 C0 80 6A 34 10 3F 1F 6A 8F"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f3-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"AutoDetect" = "1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Documents"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Desktop" = "%Documents and Settings%\%current user%\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{773a730e-74fb-11e2-b597-000c293bdf2f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f2-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f5-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp]
"Trojan.exe" = "Trojan"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Desktop" = "%Documents and Settings%\All Users\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"
"Personal" = "%Documents and Settings%\%current user%\My Documents"

The Backdoor modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"UNCAsIntranet" = "1"

The Backdoor modifies IE settings for security zones to map all web-nodes that bypassing the proxy to the Intranet Zone:

"ProxyBypass" = "1"

The Backdoor modifies IE settings for security zones to map all urls to the Intranet Zone:

"IntranetName" = "1"

The process netsh.exe:3852 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy\traceIdentifier]
"Guid" = "5f31090b-d990-4e91-b16d-46121d0255aa"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\qagent]
"Active" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil\traceIdentifier]
"Guid" = "8aefce96-4618-42ff-a057-3536aa78233e"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\NAP\Netsh]
"ControlFlags" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\qagent]
"ControlFlags" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\NAP\Netsh]
"Active" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\NAP\Netsh\Napmontr]
"BitNames" = " NAP_TRACE_BASE NAP_TRACE_NETSH"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy]
"Active" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg\traceIdentifier]
"BitNames" = " Error Unusual Info Debug"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg]
"Active" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy\traceIdentifier]
"BitNames" = " Error Unusual Info Debug"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg]
"ControlFlags" = "1"
"LogSessionName" = "stdout"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\NAP\Netsh\Napmontr]
"Guid" = "710adbf0-ce88-40b4-a50d-231ada6593f0"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil]
"Active" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\qagent\traceIdentifier]
"BitNames" = " Error Unusual Info Debug"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappprxy]
"LogSessionName" = "stdout"
"ControlFlags" = "1"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\qagent\traceIdentifier]
"Guid" = "b0278a28-76f1-4e15-b1df-14b209a12613"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\eappcfg\traceIdentifier]
"Guid" = "5f31090b-d990-4e91-b16d-46121d0255aa"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil\traceIdentifier]
"BitNames" = " Error Unusual Info Debug"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "0B 8C DC DB 4D 2A 8D 19 95 C4 37 79 62 41 73 0C"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\NAP\Netsh]
"LogSessionName" = "stdout"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\qagent]
"LogSessionName" = "stdout"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\QUtil]
"LogSessionName" = "stdout"
"ControlFlags" = "1"

Adds a rule to the firewall Windows which allows any network activity:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%Documents and Settings%\%current user%\Local Settings\Temp]
"Trojan.exe" = "%Documents and Settings%\%current user%\Local Settings\Temp\Trojan.exe:*:Enabled:Trojan.exe"

The process RunDll32.exe:3860 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "2B 21 85 DC 0C 79 16 FF 8E 46 6F 51 7C 1D 15 C5"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cookies" = "%Documents and Settings%\%current user%\Cookies"
"History" = "%Documents and Settings%\%current user%\Local Settings\History"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "46 00 00 00 43 00 00 00 01 00 00 00 00 00 00 00"

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Backdoor deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"
"ProxyServer"
"ProxyOverride"

The process Trojan.exe:3616 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D4 A1 F7 AC F4 BD ED 0D C9 00 66 40 45 D5 A8 A9"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKCU\Environment]
"SEE_MASK_NOZONECHECKS" = "1"

To automatically run itself each time Windows is booted, the Backdoor adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"5cd8f17f4086744065eb0992a09e05a2" = "%Documents and Settings%\%current user%\Local Settings\Temp\Trojan.exe .."

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"5cd8f17f4086744065eb0992a09e05a2" = "%Documents and Settings%\%current user%\Local Settings\Temp\Trojan.exe .."

Dropped PE files

MD5 File path
abefb4708f4f4383ac3006e9b02cce4f c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Application DataBnKksxKuKN.exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

No anomalies have been detected.

Propagation

VersionInfo

Company Name:
Product Name:
Product Version: 0.0.0.0
Legal Copyright:
Legal Trademarks:
Original Filename: setup.exe
Internal Name: setup.exe
File Version: 0.0.0.0
File Description:
Comments:
Language: English (United States)

PE Sections

Name Virtual Address Virtual Size Raw Size Entropy Section MD5
.text 8192 1704276 1708032 5.50805 ea4fa50cc131b5333c69d5c3bf249765
.rsrc 1720320 108296 110592 5.03485 ab17a9ab20d3a8387bb96197a5cfa9de
.reloc 1835008 12 4096 0.011373 f501e4519881efdf841536f3ae7f76a3

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

URLs

URL IP
hxxp://a26.d.akamai.net/msdownload/update/v3/static/trustedr/en/authrootseq.txt
hxxp://a26.d.akamai.net/msdownload/update/v3/static/trustedr/en/authrootstl.cab
hxxp://com-utorrent-prod-bench-290894750.us-east-1.elb.amazonaws.com/e?i=9B80421848F2EBC943A97C3C224674E3BB0809D1
www.download.windowsupdate.com 72.247.8.81
bench.utorrent.com 54.235.164.20
router.bittorrent.com 67.215.242.138


IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

POST /e?i=9B80421848F2EBC943A97C3C224674E3BB0809D1 HTTP/1.1
Host: bench.utorrent.com
User-Agent: Hydra HttpRequest
Connection: close
Content-Length: 93

{"eventName":"hydra.compat.good","pid":"2436","h":"9B80421848F2EBC943A97C3C224674E3BB0809D1"}
HTTP/1.1 200 OK
Content-Type: text/html
Date: Tue, 29 Apr 2014 18:13:28 GMT
Server: nginx/1.4.7
X-Powered-By: PHP/5.4.27
Content-Length: 21
Connection: Close
{"response_code":200}..



GET /msdownload/update/v3/static/trustedr/en/authrootseq.txt HTTP/1.1
Accept: */*
User-Agent: Microsoft-CryptoAPI/5.131.2600.5512
Host: VVV.download.windowsupdate.com
Connection: Keep-Alive
Cache-Control: no-cache
Pragma: no-cache


HTTP/1.1 200 OK
Content-Type: text/plain
Last-Modified: Wed, 12 Mar 2014 05:29:31 GMT
Accept-Ranges: bytes
ETag: "806f4cbb43dcf1:0"
Server: Microsoft-IIS/7.5
X-Powered-By: ASP.NET
Content-Length: 18
Cache-Control: max-age=8256
Date: Tue, 29 Apr 2014 18:13:52 GMT
Connection: keep-alive
X-CCC: US
X-CID: 2
1401CF3DB40B609892....


GET /msdownload/update/v3/static/trustedr/en/authrootstl.cab HTTP/1.1


Accept: */*
User-Agent: Microsoft-CryptoAPI/5.131.2600.5512
Host: VVV.download.windowsupdate.com
Connection: Keep-Alive
Cache-Control: no-cache
Pragma: no-cache


HTTP/1.1 200 OK
Content-Type: application/octet-stream
Last-Modified: Wed, 12 Mar 2014 20:20:10 GMT
Accept-Ranges: bytes
ETag: "0b96c77303ecf1:0"
Server: Microsoft-IIS/7.5
X-Powered-By: ASP.NET
Content-Length: 54007
Cache-Control: max-age=4789
Date: Tue, 29 Apr 2014 18:13:52 GMT
Connection: keep-alive
X-CCC: US
X-CID: 2
MSCF............,...................I.................lDxa .authroot.s
tl......8..CK...<T...g.v!M.d..f.%d..}K..5..F..d'K......%K..%...!..=
.k..........{=/....{g.~..........<.....h..b...8..Ep.x.....G. .....p
q..``a.i|"n|8...!..gv...: I........!...%$....;PBHA.....!A....L...'...:
..0...I....fD"N#...._..?....E..m..1\.$...{P....:......../...\YB.m:....
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<<< skipped >>>
Application DataBsXOeyvQGP.exe_2436_rwx_00401000_00313000:

SSh(CZ


Remove it with Ad-Aware

  1. Click (here) to download and install Ad-Aware Free Antivirus.
  2. Update the definition files.
  3. Run a full scan of your computer.


Manual removal*

  1. Terminate malicious process(es) (How to End a Process With the Task Manager):

    %original file name%.exe:3004
    Application DataBnKksxKuKN.exe:4044
    netsh.exe:3852

  2. Delete the original Backdoor file.
  3. Delete or disinfect the following files created/modified by the Backdoor:

    %Documents and Settings%\%current user%\Local Settings\Temp\utt9.tmp.new (63 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004 (18 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Cab6.tmp (54 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Tar5.tmp (2712 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004 (408 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015 (408 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\utt1.tmp.new (2 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\i_temp.temp (218 bytes)
    %Documents and Settings%\%current user%\Application Data\uTorrent\toolbar_offer.benc (3 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\1GGYBZUQ\impression[1].png (109 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Cab4.tmp (49 bytes)
    %Documents and Settings%\%current user%\Cookies\JO3X9I5E.txt (88 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\SZIS9VJF\desktop.ini (67 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\utt8.tmp (300 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OVYHJBCC\impression[1].png (109 bytes)
    %Documents and Settings%\%current user%\Application Data\uTorrent\settings.dat.new (71 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Tar3.tmp (2712 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\SZIS9VJF\offers[1].json (738 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OVYHJBCC\desktop.ini (67 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\uttA.tmp.new (62 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\idlimage.temp (292 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\SZIS9VJF\dll_optimizerpro_20140210[1].jpg (2526 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\offconfig.temp (3 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-796845957-1563985344-1801674531-1003\1f91d2d17ea675d4c2c3192e241743f9_f3a4e041-90c9-46df-a35a-850a694fae5b (105 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015 (54 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\1GGYBZUQ\desktop.ini (67 bytes)
    %Documents and Settings%\%current user%\Application Data\uTorrent\toolbar.benc.new (63 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Cab2.tmp (49 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Tar7.tmp (2712 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\ADKAppsOfferManager.dll (102 bytes)
    %Documents and Settings%\%current user%\Local Settings\Application DataBnKksxKuKN.exe (29 bytes)
    %Documents and Settings%\%current user%\Local Settings\Application DataBsXOeyvQGP.exe (9606 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Trojan.exe (29 bytes)
    %System%\wbem\Logs\wbemprox.log (42 bytes)

  4. Delete the following value(s) in the autorun key (How to Work with System Registry):

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "5cd8f17f4086744065eb0992a09e05a2" = "%Documents and Settings%\%current user%\Local Settings\Temp\Trojan.exe .."

    [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
    "5cd8f17f4086744065eb0992a09e05a2" = "%Documents and Settings%\%current user%\Local Settings\Temp\Trojan.exe .."

  5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  6. Reboot the computer.

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.

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