Trojan-Spy:W32/Ambler.C

Classification

Category :

Malware

Type :

Trojan-Spy

Aliases :

Trojan-Spy:W32/Ambler.C, Trojan-Spy:W32/Ambler.C, Trojan-Downloader.Win32.BHO.acb, TrojanSpy:Win32/Ambler.F (Microsoft)

Summary

This type of trojan secretly installs spy programs and/or keylogger programs.

Removal

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.

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 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.

Technical Details

This malware secretly captures a user's credentials for Internet banking webpages; the stolen information is then forwarded to a remote server.

Installation

The trojan uses the following file names to register itself as Internet Explorer's plugin:

  • svchstb.dll
  • smbmngr.dll

Execution

The captured credentials are first encrypted and stored in:

  • %windir%\system32\alog.txt.

Periodically, the information in the file is forwarded (using the HTTP POST command) to the following remote servers:

  • http://vcounter.cn/stat2/[...].php
  • http://vcounter.cn/stat2/[...].php
  • http://vcounter.cn/stat2/[...].php
  • http://vcounter.cn/stat2/[...].php