Trojan-Downloader:JS/Agent.CKL

Classification

Malware

Trojan-Downloader

JS

Trojan-Downloader:JS/Agent.CKL, Trojan-Downloader.JS.Agent.ckl

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

Upon execution, this trojan will try to take advantage of the following vulnerabilities:

  • Microsoft Office Snapshot Viewer ActiveX vulnerability
  • Sina DLoader Class ActiveX Control 'DonwloadAndInstall' Method Arbitrary File Download Vulnerability
  • Internet Explorer (MDAC) Remote Code Execution Exploit (MS06-014)
  • UUSee UUUpgrade ActiveX Control 'Update' Method Arbitrary File Download Vulnerability
  • Ourgame 'GLIEDown2.dll' ServerList Method ActiveX Control Remote Code Execution Vulnerability
  • RealPlayer IERPCtl.IERPCtl.1 (CVE-2007-5601)
  • Baidu Soba Remote Code Execute Vulnerability
  • DPClient.Vod (CVE-2007-6144)

If any of these vulnerabilities are present on the user's system, the malware will exploit it in order to download and execute files from the following sites:

  • http://down.hs7yue.cn/[...]/a2.css - Trojan.Win32.Agent.wnu
  • http://down.hs7yue.cn/[...]/sina.exe - Trojan.Win32.Agent.wnu
  • http://down.hs7yue.cn/[...]/Baidu.cab - Trojan-Downloader.Win32.Agent.wps
  • http://jzm015.cn/[...]115.swf - Exploit.SWF.Downloader.eh
  • http://jzm015.cn/[...]115.swf - Exploit.SWF.Downloader.eh
  • http://down.hs7yue.cn/[...]/UU.ini - unavailable

The online F-Secure Health Check can help determine whether a user's system has vulnerabilities which can be exploited, and assist in finding fixes for any vulnerabilities discovered.