Sophos

W32/Kelvir-BI

Aliases
  • Backdoor.Win32.VB.amp
  • W32.Kelvir
  • WORM_KELVIR.DD
Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Chat programs
  • Peer-to-peer
Affected operating systems Windows
Characteristics
  • Installs itself in the registry
Included in our products from February 2006 (4.02)
Protection available since 8 December 2005 21:54:13 (GMT)
Detected by All Sophos products

Action

More Information

W32/Kelvir-BI is a worm and backdoor Trojan for the Windows platform.

W32/Kelvir-BI includes functionality to access the internet and communicate with
a remote server via HTTP.

W32/Kelvir-BI sends itself to MSN contacts with any of the following messages:

This is what i made for u (K)
What, damn i never seen this before if u do, let me know.
I think i love this person, it's so beautifull :$

W32/Kelvir-BI can also spread by copying itself to the download folders of the peer-to-peer networking applications Shareaza, Emule and Limewire.

When first run W32/Kelvir-BI copies itself to <Windows>\service.exe.

The following registry entries are created to run service.exe on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Service
<Windows>\service.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Service
<Windows>\service.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Service
<Windows>\service.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Service
<Windows>\service.exe

The following registry entries are also set:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
DisableRegistryTools
1

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4

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