Virus:TR/Cosmu.pqi
Date discovered:16/04/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:303.104 Bytes
MD5 checksum:ad10368d7dcc4bafa74199e61f1153df
IVDF version:7.10.06.111 - Friday, April 16, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Bitdefender: Trojan.Generic.3576196
   •  Panda: Trj/Nabload.DRP
   •  Eset: Win32/AutoRun.Agent.VS


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


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

 Files It copies itself to the following locations:
   • C:\Program Files\Windows Common Files\Commgr.exe
   • %recycle bin%\X-1-5-21-1960408961-725345543-839522115-1003\WinSysApp.exe
   • C:\Program Files\Windows Alerter\WinAlert.exe
   • %drive%\RECYCLER\EeStNiO.exe



The following files are created:

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

– %recycle bin%\X-1-5-21-1960408961-725345543-839522115-1003\wndsvc.dll
– %recycle bin%\X-1-5-21-1960408961-725345543-839522115-1003\info
– %recycle bin%\X-1-5-21-1960408961-725345543-839522115-1003\bnf0342



It tries to executes the following files:

– Filename:
   • "C:\Program Files\Windows Common Files\Commgr.exe"


– Filename:
   • "C:\Program Files\Windows Alerter\WinAlert.exe"


– Filename:
   • "%recycle bin%\X-1-5-21-1960408961-725345543-839522115-1003\WinSysApp.exe"

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "WindowMessenger"="%recycle bin%\X-1-5-21-1960408961-725345543-839522115-1003\WinSysApp.exe"
   • "Windows Alerter"="C:\Program Files\Windows Alerter\WinAlert.exe"
   • "Windows Common Files Manager"="C:\Program Files\Windows Common Files\Commgr.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "WindowMessenger"="%recycle bin%\X-1-5-21-1960408961-725345543-839522115-1003\WinSysApp.exe"
   • "Windows Alerter"="C:\Program Files\Windows Alerter\WinAlert.exe"
   • "Windows Common Files Manager"="C:\Program Files\Windows Common Files\Commgr.exe"



The following registry key is changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "HideFileExt"=dword:0x00000001
   • "ShowSuperHidden"=dword:0x00000000
   • "SuperHidden"=dword:0x00000000

 Process termination The following process is terminated:
   • taskmgr.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 Tuesday, July 13, 2010
Description updated by Petre Galan on Tuesday, July 20, 2010

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