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


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


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.

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Submit a sample

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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:

  •[...]/a2.css - Trojan.Win32.Agent.wnu
  •[...]/sina.exe - Trojan.Win32.Agent.wnu
  •[...]/ - Trojan-Downloader.Win32.Agent.wps
  •[...]115.swf -
  •[...]115.swf -
  •[...]/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.

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