BDS/VB.agz - Backdoor Server

See also

Summary

Full description

Statistics

Virus:	BDS/VB.agz
Date discovered:	24/12/2005
Type:	Backdoor Server
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	30.720 Bytes
MD5 checksum:	65a87b2a54e20C6a2f2a097f0A45a39c
VDF version:	6.33.00.63 - Sat, 24 Dec 2005 14:51 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Mcafee: Keylog-Sters
   • Kaspersky: Backdoor.Win32.VB.agz
   • F-Secure: W32/Backdoor.HPK
   • VirusBuster: trojan Backdoor.VB.EAX

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

Side effects:
   • Downloads malicious files
   • Drops a file
   • Registry modification

Files It deletes the initially executed copy of itself.

It deletes the following file:
   • %cookies%\*.txt

The following file is created:

– %malware execution directory%\%executed file%.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

It tries to download some files:

– The location is the following:
   • %given parameter%/%given parameter%.dll
It is saved on the local hard drive under: %SYSDIR%%given parameter%.dll Furthermore this file gets executed after it was fully downloaded.

– The location is the following:
   • %given parameter%/smss.exe
It is saved on the local hard drive under: %WINDIR%\smss.exe Furthermore this file gets executed after it was fully downloaded.

Registry The following registry keys are added:

– [HKLM\SYSTEM\CurrentControlSet\Control\InitRegKey]
   • "initSmss"="0"
   • "initInstalled"="%random date%"
   • "initCount"="0"
   • "initNotAlive"="0"
   • "initID"="%computer name%-%several random numbers from 0 to 9%"
   • "initRegion"="other"
   • "initIP"="no_ip"
   • "initURLHTTP"="%given parameter%/"
   • "initWWW4FTPupdate"="%given parameter%?other"
   • "initWWW4FTPbackup"="%given parameter%?other"
   • "initWWW4FileRedir"="%given parameter%"
   • "initMajorVersion"="%given parameter%"

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{1E6CE4CD-161B-4847-B8BF-E2EF72299D69}]
   • "@"=" "

Backdoor Contact server:
The following:
   • %given parameter%

As a result it may send information and remote control could be provided.

Sends information about:
    • Computer name
    • Current user
    • IP address
    • Current malware status

Remote control capabilities:
    • Download file
    • Visit a website

File details Programming language:
The malware program was written in Visual Basic.

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

See a brief description here.

Description inserted by Daniel Constantin on Tue, 10 Jan 2006 10:15 (GMT+1)
Description updated by Daniel Constantin on Tue, 10 Jan 2006 15:39 (GMT+1)

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