BDS/Wallz - Backdoor Server

See also

Summary

Full description

Statistics

Virus:	BDS/Wallz
Date discovered:	13/10/2005
Type:	Backdoor Server
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	6.686 Bytes
MD5 checksum:	8b14dcb37bde5c1558a0f29f4d51a23e
VDF version:	6.30.00.153 - Tue, 03 May 2005 16:09 (GMT+1)

General Method of propagation:
   • Local network

Aliases:
   • Symantec: W32.Wallz
   • Kaspersky: Backdoor.Win32.Small.fb
   • TrendMicro: BKDR_SMALL.AIH
   • Sophos: Troj/Bdoor-HU
   • Grisoft: IRC/BackDoor.SdBot.185.BE
   • VirusBuster: Backdoor.Small.EU
   • Bitdefender: Backdoor.Small.FB

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

Side effects:
   • Registry modification
   • Steals information
   • Third party control

Files It copies itself to the following location:
• %SYSDIR%\mousehs.exe

Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\mousehs]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%SYSDIR%\mousehs.exe"
   • "DisplayName"="Mouse Hardware Sync"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex values%
   • "Description"="Enables a computer to maintain synchronization with a PS/2 pointing device. Stopping or disabling this service will result in system instability."

– [HKLM\SYSTEM\CurrentControlSet\Services\mousehs\Security]
   • ""Security"=%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Services\mousehs\Enum]
   • "0"="Root\\LEGACY_MOUSEHS\\0000"
   • "Count"=dword:00000001
   • "NextInstance"=dword:00000001

The following registry key is added:

– [HKLM\SYSTEM\CurrentControlSet\Control\Lsa]
   • "restrictanonymous"=dword:00000001

The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Ole]
   Old value:
   • "EnableDCOM"=%user defined settings%
   New value:
   • "EnableDCOM"="n"

Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.

Exploit:
It makes use of the following Exploit:
– MS03-039 (Buffer Overrun in RPCSS Service)
– MS04-011 (LSASS Vulnerability)

IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: symantec.loves.the.cock.**********
Port: 18067
Channel: #16
Nickname: 16-%radom hex number%
Password: hgianogh

Server: **********.game2max.net
Port: 18067
Channel: #16
Nickname: 16-%radom hex number%
Password: hgianogh

– This malware has the ability to collect and send the following information:
    • Information about the Windows operating system

– Furthermore it has the ability to perform actions such as:
    • Download file
    • Execute file

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

See a brief description here.

Description inserted by Iulian Popa on Thu, 20 Oct 2005 16:46 (GMT+1)
Description updated by Iulian Popa on Thu, 27 Oct 2005 10:21 (GMT+1)

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