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Virus:Worm/Taterf.B.102
Date discovered:01/04/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:171.008 Bytes
MD5 checksum:8f9105dcd46bd9b3bb5a0bf0d5267e49
IVDF version:7.10.06.15 - Thursday, April 1, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Sophos: Mal/EncPk-OJ
   •  Bitdefender: Trojan.Generic.3596481
   •  Panda: W32/Lineage.LLZ
   •  Eset: Win32/PSW.OnLineGames.OUM


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Lowers security settings
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\cyban.exe
   • %drive%\m2ld.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %SYSDIR%\cyban0.dll
   • %TEMPDIR%\ah1.rar
   • %TEMPDIR%\ah.exe



The following files are created:

– %drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

– %TEMPDIR%\ah1.rar
– %TEMPDIR%\ah.exe
– %SYSDIR%\cyban0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dbit

– %SYSDIR%\ieban0.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Autorun.bfse

– %SYSDIR%\ahnabc0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ASPM.Gen

– %SYSDIR%\ahnabc.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ASPM.Gen

– %temporary internet files%\ah1[1].rar
– %temporary internet files%\ah[1].rar
– %SYSDIR%\ahnie0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ASPM.Gen




It tries to download some files:

– The location is the following:
   • http://www.googlevmk.com/1hg/**********


– The location is the following:
   • http://www.googlew65.com/1hg/**********




It tries to executes the following files:

– Filename:
   • \??\%SYSDIR%\regsvr32.exe


– Filename:
   • \??\%PROGRAM FILES%\Internet Explorer\iexplore.exe


– Filename:
   • \??\%TEMPDIR%\ah.exe

 Registry The following registry key is added in order to run the process after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "ahncsos"="%SYSDIR%\ahnabc.exe"
   • "cybansos"="%SYSDIR%\cyban.exe"



The following registry keys are added:

– [HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0\FLAGS]
   • "@"="0"

– [HKLM\SOFTWARE\Classes\CLSID\{5DA743EA-6725-4ADE-BF17-C328743011FD}\
   InprocServer32]
   • "@"="%SYSDIR%\ahnie0.dll"
   • "ThreadingModel"="Apartment"

– [HKLM\SOFTWARE\Classes\Interface\
   {5DA743EB-6725-4ADE-BF17-C328743011FD}\ProxyStubClsid]
   • "@"="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0\0\win32]
   • "@"="%SYSDIR%\ahnie0.dll"

– [HKLM\SOFTWARE\Classes\CLSID\
   {7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}]
   • "@"="IEHlprObj Class"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {7F235922-8F2C-4C08-83A8-BBE01BF9CC64}\1.0]
   • "@"="IEHelper 1.0 Type Library"

– [HKLM\SOFTWARE\Classes\Interface\
   {5DA743EB-6725-4ADE-BF17-C328743011FD}]
   • "@"="IIEHlprObj"

– [HKLM\SOFTWARE\Classes\CLSID\{7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}\
   VersionIndependentProgID]
   • "@"="IEHlprObj.IEHlprObj"

– [HKLM\SOFTWARE\Classes\CLSID\
   {5DA743EA-6725-4ADE-BF17-C328743011FD}]
   • "@"="IEHlprObj Class"

– [HKLM\SOFTWARE\Classes\Interface\
   {5DA743EB-6725-4ADE-BF17-C328743011FD}\ProxyStubClsid32]
   • "@"="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj\CurVer]
   • "@"="IEHlprObj.IEHlprObj.1"

– [HKLM\SOFTWARE\Classes\Interface\
   {7F23592C-8F2C-4C08-83A8-BBE01BF9CC64}\ProxyStubClsid32]
   • "@"="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj]
   • "@"="IEHlprObj Class"

– [HKLM\SOFTWARE\Classes\CLSID\MNDOWN]
   • "urlinfo"="chhjmf.p"

– [HKLM\SOFTWARE\Classes\CLSID\{5DA743EA-6725-4ADE-BF17-C328743011FD}\
   ProgID]
   • "@"="IEHlprObj.IEHlprObj.1"

– [HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1\CLSID]
   • "@"="{5DA743EA-6725-4ADE-BF17-C328743011FD}"

– [HKLM\SOFTWARE\Classes\Interface\
   {7F23592C-8F2C-4C08-83A8-BBE01BF9CC64}\TypeLib]
   • "@"="{7F235922-8F2C-4C08-83A8-BBE01BF9CC64}"
   • "Version"="1.0"

– [HKLM\SOFTWARE\Classes\Interface\
   {7F23592C-8F2C-4C08-83A8-BBE01BF9CC64}\ProxyStubClsid]
   • "@"="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1]
   • "@"="IEHlprObj Class"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {7F235922-8F2C-4C08-83A8-BBE01BF9CC64}\1.0\0\win32]
   • "@"="%SYSDIR%\ieban0.dll"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {7F235922-8F2C-4C08-83A8-BBE01BF9CC64}\1.0\FLAGS]
   • "@"="0"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0]
   • "@"="IEHelper 1.0 Type Library"

– [HKLM\SOFTWARE\Classes\Interface\
   {5DA743EB-6725-4ADE-BF17-C328743011FD}\TypeLib]
   • "@"="{5DA7432B-6725-4ADE-BF17-C328743011FD}"
   • "Version"="1.0"

– [HKLM\SOFTWARE\Classes\Interface\
   {7F23592C-8F2C-4C08-83A8-BBE01BF9CC64}]
   • "@"="IIEHlprObj"

– [HKLM\SOFTWARE\Classes\CLSID\{7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}\
   ProgID]
   • "@"="IEHlprObj.IEHlprObj.1"

– [HKLM\SOFTWARE\Classes\CLSID\{5DA743EA-6725-4ADE-BF17-C328743011FD}\
   VersionIndependentProgID]
   • "@"="IEHlprObj.IEHlprObj"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0\HELPDIR]
   • "@"="%SYSDIR%\"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {7F235922-8F2C-4C08-83A8-BBE01BF9CC64}\1.0\HELPDIR]
   • "@"="%SYSDIR%\"

– [HKLM\SOFTWARE\Classes\CLSID\{7F23592B-8F2C-4C08-83A8-BBE01BF9CC64}\
   InprocServer32]
   • "@"="%SYSDIR%\ieban0.dll"
   • "ThreadingModel"="Apartment"



The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoDriveTypeAutoRun"=dword:0x00000091

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

 Injection –  It injects the following file into a process: %SYSDIR%\cyban0.dll

    Process name:
   • explorer.exe



– It injects itself as a remote thread into a process.

    Process name:
   • iexplore.exe



–  It injects the following file into a process: %SYSDIR%\ahnabc0.dll

    Process name:
   • explorer.exe


 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Monday, July 26, 2010
Description updated by Petre Galan on Monday, July 26, 2010

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