1. Symantec/
  2. Security Response/
  3. Downloader.Chekin


Risk Level 1: Very Low

June 23, 2003
February 13, 2007 12:02:49 PM
Also Known As:
TrojanDownloader.Win32.Checkin, TrojanDownloader.Win32.Checkin, Trojan.Download.Chekin
Trojan Horse
Systems Affected:

Downloader.Chekin is a Trojan Horse that appears to be a component of an adware application. This program periodically checks for new updates and launches them. The updates may come from any Web server on any IP address. A check is not made to verify their integrity prior to execution.

This Trojan is written in Microsoft Visual C++.

  • Virus definitions dated prior to June 24, 2003 may detect this as either Security Risk or Download.Trojan.
  • Sbsrch_v22.dll and Ttps.exe are additional files that have been found to be related to Downloader.Chekin. If the files are detected, delete them.
  • There have been reports that the file, Sifxinst.exe, is a file that the Trojan uses, and that this file, when run, creates the file, Owmngr.exe.
  • Virus definitions dated June 6, 2006 or earlier may detect this threat as Trojan.Download.Chekin.

Antivirus Protection Dates

  • Initial Rapid Release version June 24, 2003
  • Latest Rapid Release version August 8, 2016 revision 023
  • Initial Daily Certified version June 24, 2003
  • Latest Daily Certified version August 9, 2016 revision 001
  • Initial Weekly Certified release date June 25, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Scott Gettis

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STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
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