Remove Trojan.Zlob

Posted on: April 29th, 2009


Discovered: April 23, 2005
Updated:

June 1, 2006 2:36:46 PM

Type:

Trojan

Systems Affected:

Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

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Technical Details:
Trojan.Zlob has been renamed from Trojan.Zhopa.

Trojan.Zlob is a Trojan that allows the remote attacker to perform various

malicious actions on the compromised computer.

When Trojan.Zlob is executed, it copies itself as one of the following:

* %System%\msmsgs.exe

* %System%\ld100.tmp

* %System%\regperf.exe

It may create the following registry entries so that the Trojan runs every time

Windows starts:

* HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current

Version\Run\”MSN Messenger” = “%System%\msmsgs.exe”

* HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\

CurrentVersion\Winlogon\”Shell” = “Explorer.exe, msmsgs.exe”

The Trojan also adds the following registry entries:

* HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Current

Version\policies\explorer\run\”wininet.dll” = “regperf.exe”

* HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\

Policies\Explorer\Run\”notepad.exe” = “msmsgs.exe”

It also adds the following marker in the registry:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\

“uuid” = “86c29b2f-3389-418b-9b47-c2b09b6abc07″

The Trojan then injects itself into explorer.exe.

It attempts to make HTTP connections to the following hosts:

* vnp7s.net

* zxserv0.com

* dumpserv.com

The Trojan uses different URLs that allow the Trojan to ping, report its status,

and execute remote files.

Action Steps:
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