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  Home / Viruses / Virus Encyclopedia / Malware Descriptions / Trojan Programs / Trojan Downloaders

Trojan-Downloader.Win32.Agent.alr

Detection added Jun 15 2006 18:19 GMT
Update released Jun 15 2006 20:13 GMT
Description added Oct 03 2006
Behavior TrojanDownloader

Technical details

This Trojan downloads files via the Internet without the user's knowledge or consent.

The Trojan itself is a Windows PE EXE file, written in Visual C++. It is not packed in any way. The file size may vary from 55KB to 95KB.

Payload

When launching, the Trojan causes the following dialogue box to be displayed:

Once the user clicks on "Continue", the Trojan connects to 66.244.***.178 (*****.errorsafe.com) and downloads software called ErrorSafe:

The Trojan loads the setup.exe file (2352848 bytes in size) to %temp%\NI.UERS_0001_N85M0906 and then launches it for execution. This files installs a program which contains another Trojan program within it. This Trojan will be detected by Kaspersky Anti-Virus as Trojan-Downloader.Win32.Agent.aqh.

The Trojan also creates a unique identifier, "InstallMutex", to flag its presence in the system.

 

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