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Virus:TR/Zbot.836
Date discovered:22/09/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium to high
Damage Potential:Medium
Static file:Yes
File size:43.008 Bytes
MD5 checksum:202a068e9e52853d7ed7887ec7dfbe52
VDF version:7.10.05.78
IVDF version:7.10.11.254 - Wednesday, September 22, 2010

 General Methods of propagation:
   • Autorun feature
   • Infects files


Aliases:
   •  Mcafee: W32/Ramnit
   •  Kaspersky: Backdoor.Win32.IRCNite.aqg
   •  Sophos: Mal/FakeAV-BW
   •  Bitdefender: Trojan.Zbot.836
   •  GData: Trojan.Zbot.836


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


Side effects:
   • Drops malicious files
   • Infects files
   • Registry modification

 Files It copies itself to the following locations:
   • %PROGRAM FILES%\Microsoft\DesktopLayer.exe
   • %drive%\RECYCLER\autorun.exe



The following files are created:

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

%PROGRAM FILES%\Internet Explorer\dmlconf.dat



It tries to execute the following files:

– Filename:
   • %PROGRAM FILES%\Microsoft\DesktopLayer.exe


– Filename:
   • %PROGRAM FILES%\Internet Explorer\IEXPLORE.EXE

 Registry The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   New value:
   • "Userinit"="%SYSDIR%\userinit.exe,,%PROGRAM FILES%\microsoft\desktoplayer.exe"

 File infection Infector type:

Appender - The virus main code is added at the end of the infected file.
– The following section is added to the infected file:
   • .rmnet


Stealth:
No stealth techinques used. It modifies the OEP (Original Entry Point) of the infected file to point to the virus code.


Method:

This direct-action infector actively searches for files.


The following files are infected:

By file type:
   • exe (+44544) -> W32/Ramnit.A
   • dll (+44544) -> W32/Ramnit.A
   • html (+86498) -> HTML/Drop.Agent.AB

 Backdoor Contact server:
The following:
   • jef**********.com:442 (TCP)


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

    Process name:
   • iexplore.exe


 Miscellaneous  Checks for an internet connection by contacting the following web sites:
   • google.com:80
   • bing.com:80
   • yahoo.com:80


Mutex:
It creates the following Mutex:
   • KyUffThOkYwRRtgPP

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

說明撰寫者 Petre Galan 開啟 2011年4月8日星期五
說明更新者 Petre Galan 開啟 2011年4月8日星期五

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