Worm/Warezov.B.2 - Worm

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Summary

Full description

Statistics

Virus:	Worm/Warezov.B.2
Date discovered:	29/08/2006
Type:	Worm
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	88.995 Bytes
MD5 checksum:	392dd1ad2ed5f06058e0e46df00C89b2
VDF version:	6.35.01.157
IVDF version:	6.35.01.160 - Wed, 30 Aug 2006 10:54 (GMT+1)

General Method of propagation:
   • Email

Aliases:
   • Symantec: W32/Stration@MM
   • Kaspersky: Email-Worm.Win32.Warezov.h
   • TrendMicro: WORM_STRATION.AY
   • VirusBuster: Trojan.Opnis.AH
   • Eset: Win32/Stration.N
   • Bitdefender: Win32.Worm.Stration.C

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads a file
   • Drops a file
   • Drops a malicious file
   • Uses its own Email engine
   • Registry modification

Right after execution the following information is displayed:

Files It copies itself to the following location:
   • %WINDIR%\rsmb.exe

The following files are created:

– A file that contains collected email addresses:
   • %WINDIR%\rsmb.wax

– %WINDIR%\rsmb.gfx
– %malware execution directory%\%two-digit random character string%.tmp
– %WINDIR%\rsmb.dll Used to hide a process. Detected as: Worm/Warezov.C

It tries to download a file:

– The location is the following:
   • gadesunheranwui.com/chr/zjjk/**********
At the time of writing this file was not online for further investigation.

Registry The following registry key is added in order to run the process after reboot:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
• "rsmb"="%WINDIR%\rsmb.exe s"

Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:

From:
The sender address is spoofed.

To:
– Email addresses found in specific files on the system.
– Email addresses gathered from WAB (Windows Address Book)

Subject:
One of the following:
   • Error
   • picture
   • Status
   • Good day
   • Mail Delivery System
   • Mail Transaction Failed

Body:
The body of the email is one of the lines:
   • The message contains Unicode characters and has been sentas a binary attachment.
   • The message cannot be represented in 7-bit ASCII encodingand has been sent as a binary attachment
   • Mail transaction failed. Partial message is available.

Attachment:
The filename of the attachment is constructed out of the following:

– It starts with one of the following:
   • test
   • file
   • doc
   • document
   • message

    Continued by one of the following fake extensions:
   • dat
   • log
   • msg
   • txt

    The file extension is one of the following:
   • exe
   • cmd
   • pif

The attachment is a copy of the malware itself.

The email looks like the following:

Mailing Search addresses:
It searches the following files for email addresses:
   • xml; xls; wsh; wab; uin; txt; tbb; stm; shtm; sht; php; oft; ods; nch;
      msg; mmf; mht; mdx; mbx; jsp; html; htm; eml; dhtm; dbx; cgi; cfg;
      asp; adb

File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• MEW

See a brief description here.

Description inserted by Irina Boldea on Thu, 12 Oct 2006 15:19 (GMT+1)
Description updated by Irina Boldea on Thu, 19 Oct 2006 16:21 (GMT+1)

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