Worm:W32/Agent.T

Classification

Malware

Worm

W32

Trojan.Downloader-1419, Trojan.Downloader.Agent.ASH, W32/Generic.m

Summary

Worm:W32/Agent.T drops several copies of itself onto the system and downloads other additional malware from the Internet.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

Network Disinfection

For general instructions on disinfecting a local network infection, please see Eliminating A Local Network Outbreak.

Find out more

Knowledge Base

Find the latest advice in our Community Knowledge Base.

User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

Execution

Upon execution, Agent.T drops the following files:

  • %windir%\yqqty.exe - A copy of itself.

It modifies the following autostart registry entry to enable its automatic execution every system boot-up:

  • [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] Userinit=%windir%\system32\userinit.exe,%windir%\yqqty.exe

Note: The default value is Userinit=%windir%\system32\userinit.exe

It may drop a copy of itself to several drives. The Autorun.inf file, which is a configuration file used to automatically execute the malware when a directory or drive is being opened, is also dropped together with the main executable file.

Activity

Agent.T downloads the following files from the Internet:

  • https://www.sinavip.net/A[REMOVED].asp
  • https://www.sinavip.net/L[REMOVED].txt

It then saves the files to the Windows directory using the following filenames:

  • listsas.txt
  • saslogww.txt

One of the text files contains the following download sites:

  • https://www.aame.cn/k[REMOVED].rar
  • https://www.aame.cn/c[REMOVED].rar

The downloaded files are also trojan-downloaders that are now detected as Trojan-Downloader:W32/Small.EJW and Trojan-Downloader:W32/Small.ELM.

Date Created: 2010-06-02 06:24:30.0

Date Last Modified: 2010-06-02 06:27:58.0