Trojan-Downloader:W32/Agent.HSM

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Classification

Category:

Malware

Type:

Trojan-Downloader

Platform:

W32

Aliases:

Trojan-Downloader:W32/Agent.HSM

Summary

This type of trojan secretly downloads malicious files from a remote server, then installs and executes the files.

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.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

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

This trojan may be downloaded from a malicious website. It may also arrive as an email attachment.Known email subjects associated with this malware are:

  • Really cool photos
  • Exclusive photos, you'll be happy
  • Spam: Great photos for you
  • Great photos for you
  • The best photos for you

Installation

During installation, the trojan will drop a copy of itself to:

  • %systemroot%\system32\rs32net.exe

It also sets a launch point with the following registry key:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run rs32net = %systemroot%\system32\rs32net.exe

It will then try to launch svchost.exe, and injects its code by replacing the launched svchost.exe code.

Execution

Upon execution, this malware will attempt to connect to the following websites:

  • http://astana1988.[...]hostia.com
  • http://astana.[...]fire.net

It then attempts to download additional files from the following IP addresses:

  • 91.203.92.7
  • 208.66.195.16
  • 208.66.195.71
  • 208.66.195.232
  • 208.66.195.240
  • 216.195.55.50
  • 216.195.56.22
  • 209.66.122.238

As of this writing, these IP addresses are down and are not available.