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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

Descrizione inserita da Petre Galan su lunedì 11 aprile 2011
Descrizione aggiornata da Petre Galan su lunedì 11 aprile 2011

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