Worm/Wootbot.69120 - Worm

See also

Summary

Full description

Statistics

Virus:	Worm/Wootbot.69120
Date discovered:	27/02/2006
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	69.120 Bytes
MD5 checksum:	9c45675530bcdb29c236e8e552a21861
VDF version:	6.33.01.33 - Mon, 27 Feb 2006 15:34 (GMT+1)

General Method of propagation:
   • Local network

Aliases:
   • TrendMicro: WORM_AGOBOT.BAV
   • Bitdefender: Backdoor.SDBot.801370DB

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

Side effects:
   • Registry modification
   • Makes use of software vulnerability
   • Steals information
   • Third party control

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

It deletes the initially executed copy of itself.

Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • Windows Logon Autorun = winlogins.exe

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce]
   • Windows Logon Autorun = winlogins.exe

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • Windows Logon Autorun = winlogins.exe

– [HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce]
   • Windows Logon Autorun = winlogins.exe

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
   • Windows Logon Autorun = winlogins.exe

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

– [HKLM\SYSTEM\CurrentControlSet\Services\win]
   • Type = dword:00000020
   • Start = dword:00000004
   • ErrorControl = dword:00000001
   • ImagePath = "%SYSDIR%\winlogins.exe" -netsvcs
   • DisplayName = Windows Logon Autorun
   • ObjectName = LocalSystem
   • FailureActions = %hex values%
   • DeleteFlag = dword:00000001

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

– [HKLM\SYSTEM\CurrentControlSet\Services\win\Enum]
   • 0 = Root\\LEGACY_WIN\\0000
   • Count = dword:00000001
   • NextInstance = dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WIN]
   • NextInstance = dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WIN\0000]
   • Service = win
   • Legacy = dword:00000001
   • ConfigFlags = dword:00000000
   • Class = LegacyDriver
   • ClassGUID = {8ECC055D-047F-11D1-A537-0000F8753ED1}
   • DeviceDesc = Windows Logon Autorun

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WIN\0000\Control]
   • *NewlyCreated* = dword:00000000
   • ActiveService = win

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 Exploits:
– MS04-007 (ASN.1 Vulnerability)
– MS04-011 (LSASS Vulnerability)
– MS05-039 (Vulnerability in Plug and Play)

Infection process:
Creates an FTP script on the compromised machine in order to download the malware to the remote location.

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

Server: kocka.my**********
Port: 6660
Server password: H4xThisSite
Channel: #forbot
Nickname: ATF-%random character string%
Password: ForBotASNPnP

– This malware has the ability to collect and send information such as:
    • CPU speed
    • Free memory
    • Malware uptime
    • Size of memory
    • Username
    • Information about the Windows operating system

– Furthermore it has the ability to perform actions such as:
    • Launch DDoS ICMP flood
    • Launch DDoS UDP flood
    • Disable network shares
    • Download file
    • Edit registry
    • Enable network shares
    • Execute file
    • Perform network scan
    • Register a service
    • Restart system
    • Shut down system
    • Start spreading routine

Backdoor The following port is opened:

– winlogins.exe on a random TCP port in order to provide an FTP server.

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:
• NSPack

See a brief description here.

Description inserted by Andrei Gherman on Tue, 28 Feb 2006 15:10 (GMT+1)
Description updated by Andrei Gherman on Tue, 28 Feb 2006 15:46 (GMT+1)

» About Malware
» About Phishing
» Viruses In the Wild

« back