Backdoor.Generic.755288_a9538af39f
Susp_Dropper (Kaspersky), Backdoor.Generic.755288 (B) (Emsisoft), Backdoor.Generic.755288 (AdAware), Trojan.Win32.Sasfis.FD, VirTool.Win32.DelfInject.FD, GenericAutorunWorm.YR (Lavasoft MAS)
Behaviour: Trojan, Backdoor, Worm, VirTool, WormAutorun
The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.
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MD5: a9538af39f6444c3569c04c0ef96c800
SHA1: ef14b21e42fac0d4b9c84ed1dcaec2a8bd5f989a
SHA256: 0c3afd78f13ffa7f9c812738f4845a417f3c2537483bb5d90810f75447fc9855
SSDeep: 1536:4oM8eAZ ZzVppvVKt5vQiM8eafNb2V8N5EGlaZ7YwjWt84cZ5Y9NtXQ4ZeXQcpDj:ZMqZ dVp1VOpVaZGU BniXQKDoBWlng0
Size: 88576 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: PackerUPXCompresorGratuitowwwupxsourceforgenet, UPolyXv05_v6
Company: Installation helper
Created at: 2012-12-15 08:05:29
Analyzed on: WindowsXP SP3 32-bit
Summary:
Backdoor. Malware that enables a remote control of victim's machine.
Payload
| Behaviour | Description |
|---|---|
| WormAutorun | A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Backdoor's file once a user opens a drive's folder in Windows Explorer. |
Process activity
The Backdoor creates the following process(es):
%original file name%.exe:2716
FB_B2.tmp.exe:852
FB_B3.tmp.exe:2876
The Backdoor injects its code into the following process(es):
MicrosoftUpdate:2056
Mutexes
The following mutexes were created/opened:
No objects were found.
File activity
The process FB_B2.tmp.exe:852 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\FB_B3.tmp.exe (61 bytes)
The process FB_B3.tmp.exe:2876 makes changes in the file system.
The Backdoor creates and/or writes to the following file(s):
%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe (61 bytes)
The process MicrosoftUpdate:2056 makes changes in the file system.
The Backdoor deletes the following file(s):
%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe (0 bytes)
Registry activity
The process %original file name%.exe:2716 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\System\CurrentControlSet\Control\Session Manager]
"PendingFileRenameOperations" = "\??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\, , \??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\,"
The process FB_B2.tmp.exe:852 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CA F5 6B BB 2D 3B 6F D7 49 86 11 96 3E DF A7 17"
[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"
[HKLM\System\CurrentControlSet\Control\Session Manager]
"PendingFileRenameOperations" = "\??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\, , \??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\, , \??\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\,"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{fdd9f6f2-7454-11e2-b4cd-806d6172696f}]
"BaseClass" = "Drive"
[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp]
"FB_B3.tmp.exe" = "FB_B3.tmp"
[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"
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 urls to the Intranet Zone:
"IntranetName" = "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 process FB_B3.tmp.exe:2876 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A4 A5 2D 7A 57 9B B4 C6 10 1F 0B 2F D8 89 4B BC"
[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Application Data\Microsoft]
"MicrosoftUpdate.exe" = "MicrosoftUpdate"
[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"
[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 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 urls to the Intranet Zone:
"IntranetName" = "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 process MicrosoftUpdate:2056 makes changes in the system registry.
The Backdoor creates and/or sets the following values in system registry:
[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "F4 FB BC 7A FD E1 C8 3D 46 50 4C C8 D0 27 23 7B"
[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
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]
"MicrosoftUpdate.exe" = "%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe"
Dropped PE files
| MD5 | File path |
|---|---|
| 2678a5b18392956aad1da388059abf4d | c:\Documents and Settings\"%CurrentUserName%"\Application Data\Microsoft\MicrosoftUpdate.exe |
| 18b070da891ed263be4eadf9a8e1a30c | c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Temp\FB_B2.tmp.exe |
| 2678a5b18392956aad1da388059abf4d | c:\Documents and Settings\"%CurrentUserName%"\Local Settings\Temp\FB_B3.tmp.exe |
HOSTS file anomalies
No changes have been detected.
Rootkit activity
No anomalies have been detected.
Propagation
A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Backdoor's file once a user opens a drive's folder in Windows Explorer.
VersionInfo
Company Name:
Product Name:
Product Version: 1, 0, 0, 1
Legal Copyright: Copyright ? 2012
Legal Trademarks:
Original Filename:
Internal Name:
File Version: 1, 0, 0, 1
File Description:
Comments:
Language: Language Neutral
PE Sections
| Name | Virtual Address | Virtual Size | Raw Size | Entropy | Section MD5 |
|---|---|---|---|---|---|
| UPX0 | 4096 | 40960 | 0 | 0 | d41d8cd98f00b204e9800998ecf8427e |
| UPX1 | 45056 | 86016 | 86016 | 5.37941 | b2c11470cba39cd030fb70b86d24102d |
| .rsrc | 131072 | 4096 | 1536 | 1.95072 | 4ad48a0a788f93f8c69aa59c83d0501d |
Dropped from:
Downloaded by:
Similar by SSDeep:
Similar by Lavasoft Polymorphic Checker:
URLs
No activity has been detected.
IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)
Traffic
Web Traffic was not found.
The Backdoor connects to the servers at the folowing location(s):
`.rsrc
8W.kB
kernel32.dll
$*@@@*$@@@$ *@@* $@@($*)@-$*@@$-*@@$*-@@(*$)@-*$@@*-$@@*$-@@-* $@-$ *@* $-@$ *-@$ -*@*- $@($ *)(* $)
oleaut32.dll
EVariantBadIndexError
u%CNu
TSocketPort
TUdpSocket
TUdpSocketd
LocalPort4
RemotePort0
%d.%d.%d.%d
0.0.0.0
PSAPI.dll
Windows
Urlmon.dll
SOFTWARE\Microsoft\Windows\CurrentVersion\Run
SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
:\autorun.inf
icon=%SystemRoot%\system32\SHELL32.dll,4
\Mozilla Firefox\
nss3.dll
mozcrt19.dll
sqlite3.dll
nspr4.dll
plc4.dll
plds4.dll
nssutil3.dll
softokn3.dll
PK11_GetInternalKeySlot
userenv.dll
\Mozilla\Firefox\
profiles.ini
\signons3.txt
MSGBOX
Firefox
windows
Windows|
WebDL
URLDownloadToFileA
StUDP|
KWindows
UrlMon
GetCPInfo
RegOpenKeyExA
RegFlushKey
RegCreateKeyExA
RegCloseKey
ShellExecuteA
MsgWaitForMultipleObjects
EnumWindows
GetKeyboardType
.idata
.rdata
P.reloc
P.rsrc
.OusFd
BSS.dKv
KERNEL32.DLL
advapi32.dll
shell32.dll
SHFolder.dll
user32.dll
version.dll
wsock32.dll
%s.Seek not implemented$Operation not allowed on sorted list
Property %s does not exist
Thread creation error: %s
Thread Error: %s (%d)
%List does not allow duplicates ($0%x)#A component named %s already exists%String list does not allow duplicates
Cannot create file "%s". %s
Cannot open file "%s". %s$''%s'' is not a valid component name
Invalid property value List capacity out of bounds (%d)
List count out of bounds (%d)
List index out of bounds (%d) Out of memory while expanding memory stream
Error reading %s%s%s: %s
Failed to set data for '%s'
Ancestor for '%s' not found
Cannot assign a %s to a %sECheckSynchronize called from thread $%x, which is NOT the main thread
Class %s not found
%s (%s, line %d)
Abstract Error?Access violation at address %p in module '%s'. %s of address %p
System Error. Code: %d.
Invalid variant operation%Invalid variant operation (%s%.8x)
%s5Could not convert variant of type (%s) into type (%s)=Overflow while converting variant of type (%s) into type (%s)
Operation not supported
External exception %x
Interface not supported
Invalid pointer operation
Invalid class typecast0Access violation at address %p. %s of address %p
Privileged instruction(Exception %s in module %s at %p.
Application Error1Format '%s' invalid or incompatible with argument
No argument for format '%s'"Variant method calls not supported
!'%s' is not a valid integer value
I/O error %d
Integer overflow Invalid floating point operation
MicrosoftUpdate.exe_2056_rwx_11491000_0002A000:
kernel32.dll
$*@@@*$@@@$ *@@* $@@($*)@-$*@@$-*@@$*-@@(*$)@-*$@@*-$@@*$-@@-* $@-$ *@* $-@$ *-@$ -*@*- $@($ *)(* $)
oleaut32.dll
EVariantBadIndexError
u%CNu
TSocketPort
TUdpSocket
TUdpSocketd
LocalPort4
RemotePort0
%d.%d.%d.%d
0.0.0.0
PSAPI.dll
Windows
Urlmon.dll
SOFTWARE\Microsoft\Windows\CurrentVersion\Run
SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
:\autorun.inf
icon=%SystemRoot%\system32\SHELL32.dll,4
\Mozilla Firefox\
nss3.dll
mozcrt19.dll
sqlite3.dll
nspr4.dll
plc4.dll
plds4.dll
nssutil3.dll
softokn3.dll
PK11_GetInternalKeySlot
userenv.dll
\Mozilla\Firefox\
profiles.ini
\signons3.txt
MSGBOX
Firefox
windows
Windows|
WebDL
URLDownloadToFileA
StUDP|
KWindows
UrlMon
GetCPInfo
RegOpenKeyExA
RegFlushKey
RegCreateKeyExA
RegCloseKey
ShellExecuteA
MsgWaitForMultipleObjects
EnumWindows
GetKeyboardType
.idata
.rdata
P.reloc
P.rsrc
%s.Seek not implemented$Operation not allowed on sorted list
Property %s does not exist
Thread creation error: %s
Thread Error: %s (%d)
%List does not allow duplicates ($0%x)#A component named %s already exists%String list does not allow duplicates
Cannot create file "%s". %s
Cannot open file "%s". %s$''%s'' is not a valid component name
Invalid property value List capacity out of bounds (%d)
List count out of bounds (%d)
List index out of bounds (%d) Out of memory while expanding memory stream
Error reading %s%s%s: %s
Failed to set data for '%s'
Ancestor for '%s' not found
Cannot assign a %s to a %sECheckSynchronize called from thread $%x, which is NOT the main thread
Class %s not found
%s (%s, line %d)
Abstract Error?Access violation at address %p in module '%s'. %s of address %p
System Error. Code: %d.
Invalid variant operation%Invalid variant operation (%s%.8x)
%s5Could not convert variant of type (%s) into type (%s)=Overflow while converting variant of type (%s) into type (%s)
Operation not supported
External exception %x
Interface not supported
Invalid pointer operation
Invalid class typecast0Access violation at address %p. %s of address %p
Privileged instruction(Exception %s in module %s at %p.
Application Error1Format '%s' invalid or incompatible with argument
No argument for format '%s'"Variant method calls not supported
!'%s' is not a valid integer value
I/O error %d
Integer overflow Invalid floating point operation
Remove it with Ad-Aware
- Click (here) to download and install Ad-Aware Free Antivirus.
- Update the definition files.
- Run a full scan of your computer.
Manual removal*
- Terminate malicious process(es) (How to End a Process With the Task Manager):
%original file name%.exe:2716
FB_B2.tmp.exe:852
FB_B3.tmp.exe:2876 - Delete the original Backdoor file.
- Delete or disinfect the following files created/modified by the Backdoor:
%Documents and Settings%\%current user%\Local Settings\Temp\FB_B3.tmp.exe (61 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe (61 bytes) - Delete the following value(s) in the autorun key (How to Work with System Registry):
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"MicrosoftUpdate.exe" = "%Documents and Settings%\%current user%\Application Data\Microsoft\MicrosoftUpdate.exe" - Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
- Reboot the computer.
*Manual removal may cause unexpected system behaviour and should be performed at your own risk.
