Spyware, Viruses, & Security forum

General discussion

Troj/Nyrubot-A

by Marianna Schmudlach / March 31, 2004 11:46 PM PST

Type
Trojan

Description
Troj/Nyrubot-A is a backdoor Trojan. When run the Trojan copies itself to msgsrv32.exe in the Windows folder and ensure that the copy is run each time Windows starts by adding the following registry entry:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\Internat
= <Windows folder>\msgsrv32.exe.

Troj/Nyrubot-A also sets the following registry entries :
HKCU\Software\Microsoft\Windows\CurrentVersion\from = yugoar@centrum.cz
HKCU\Software\Microsoft\Windows\CurrentVersion\rcpt = yugoar@centrum.cz
HKCU\Software\Microsoft\Windows\CurrentVersion\smtp = data2.centrum.cz
HKCU\Software\Microsoft\Windows\CurrentVersion\tuin = 272324532
HKCU\Software\Microsoft\Windows\CurrentVersion\time_last_msg = <number>

The Trojan allows a remote attacker to control an affected computer via IRC.

One method by which this Trojan is distributed is as follows. An email in HTML format is sent. The email attempts to link to a remote website and run a script downloaded from the website. The script creates and runs the file C:\baal.exe. Baal.exe downloads an runs the Trojan from a second website. Troj/Nyrubot-A deletes C:\baal.exe.

http://www.sophos.com/virusinfo/analyses/trojnyrubota.html

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