Summary
The Agobot.VS variant was found on October 27th, 2004. We received several reports about it from the field. This backdoor is functionality similar to previous Agobot variants.
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.
Caution: Manual disinfection is a risky process; it is recommended only for advanced users.
Manual disinfection of this Agobot variant requires killing the backdoor's process in memory and deletion of the infected file from Windows System folder.
The file name is 'winl0g0n.exe'. There are zeroes instead of 'o' letters in the file name: do not confuse this file with a Windows component named 'winlogon.exe'!
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
Security Updates
The most important step of disinfection is the installation of security patches for the vulnerabilities exploited by Agobot.
Detailed information and patches are available from the following pages:
- RPC/DCOM (MS03-026, fixed by MS03-039): https://www.microsoft.com/technet/security/bulletin/MS03-039.mspx
- RPC/Locator (MS03-001): https://www.microsoft.com/technet/security/bulletin/MS03-001.mspx
- WebDAV (MS03-007): https://www.microsoft.com/technet/security/bulletin/MS03-007.mspx
- LSASS (MS04-011): https://www.microsoft.com/technet/security/bulletin/MS04-011.mspx
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.
More scanning & removal options
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the How-tos & FAQs section on the F-Secure Community site for further assistance.
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