Worm/Anixma.A - Worm

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Summary

Full description

Statistics

Virus:	Worm/Anixma.A
Date discovered:	04/10/2005
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low to medium
Damage Potential:	Medium
Static file:	Yes
File size:	29.184 Bytes
MD5 checksum:	8c70791f7ef061117dd37deb361c93df
VDF version:	6.32.0.58

General Method of propagation:
   • Messenger

Aliases:
   • TrendMicro: WORM_ANIXMA.A
   • Bitdefender: Backdoor.IRCBot.HM

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

Side effects:
   • Disable security applications
   • Lowers security settings
   • Registry modification
   • Third party control

Files It copies itself to the following location:
• %SYSDIR%\%random character string%.exe

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Windows Socketheader"="%random character string%.exe"

The values of the following registry key are removed:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • avg7_cc
   • avg7_emc
   • ccApp
   • KAV50
   • KAVPersonal50
   • McAfee Guardian
   • McAfee.InstantUpdate.Monitor

It creates the following entries in order to bypass the Windows XP firewall:

– [HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile]
   • "EnableFirewall"=dword:00000000

– [HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile]
   • "EnableFirewall"=dword:00000000

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile]
   • "EnableFirewall"=dword:00000000

Messenger It is spreading via Messenger. The characteristics are described below:

– AIM Messenger
– Windows Messenger

To:
All open conversation windows.

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

Server: xxx.s**********.biz
Port: 5190
Channel: #504
Nickname: %random character string%
Password: cali

– Furthermore it has the ability to perform actions such as:
    • Download file
    • Execute file
    • Start spreading routine
    • Terminate malware

Miscellaneous Mutex:
It creates the following Mutex:
• E8Zd9EdE

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:
• tElock

See a brief description here.

Description inserted by Iulia Diaconescu on Tue, 04 Oct 2005 13:44 (GMT+1)
Description updated by Andrei Ivanes on Wed, 12 Oct 2005 16:04 (GMT+1)

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