Full description

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.

설명 삽입자 Petre Galan 2011년 4월 8일 금요일
설명 업데이트 Petre Galan 2011년 4월 8일 금요일

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