Full description

Virus:	TR/Ramnit.A.22
Date discovered:	01/11/2010
Type:	Trojan
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Medium to high
Damage Potential:	Medium
Static file:	Yes
File size:	51.200 Bytes
MD5 checksum:	b8639c44126fb50de80354b95fad0153
VDF version:	7.10.06.22
IVDF version:	7.10.13.76 - Monday, November 1, 2010

General Methods of propagation:
   • Autorun feature
   • Infects files

Aliases:
   • Kaspersky: Backdoor.Win32.IRCNite.bwx
   • Sophos: Troj/Zbot-ADH
   • Bitdefender: Trojan.Generic.5029516
   • Panda: W32/Ramnit.B.drp
   • GData: Trojan.Generic.5029516

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:
   • %drive%\RECYCLER\svchost.exe
   • %PROGRAM FILES%\Microsoft\WaterMark.exe

The following files are created:

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

– %SYSDIR%\dmlconf.dat

It tries to execute the following files:

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

– Filename:
   • %SYSDIR%\svchost.exe

Registry The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
New value:
• "Userinit"="%SYSDIR%\userinit.exe,,%PROGRAM FILES%\microsoft\watermark.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 (+52736) -> W32/Ramnit.A
   • dll (+52736) -> W32/Ramnit.A
   • html (+102882) -> HTML/Drop.Agent.AB

Backdoor Contact server:
All of the following:
• zah**********.name:443 (TCP)
• tyb**********.com:443 (TCP)

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

Process name:
• svchost.exe

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

설명 삽입자 Petre Galan 2011년 4월 11일 월요일
설명 업데이트 Petre Galan 2011년 4월 11일 월요일

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