Summary
This type of trojan secretly downloads malicious files from a remote server, then installs and executes the files.
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 trojan-downloader appears to be related to a distribution of spam emails currently under way as of 5 April 2011, as hundreds of samples were submitted to our analysis systems in the last 24 hrs.
The spammed email uses a social engineering attack to lure the recipient into clicking on an attached executable file. This attachment is actually the trojan-downloader, disguised as a legitimate document. The attachment uses a PDF file icon and the filename 'dhl.exe' to further disguise itself.
On clicking the file, the trojan-downloader is executed and creates a dummy svchost.exe process. It then injects a thread that downloads and executes a file from:
- h t t p : / / puskovayaustanovka.ru/pusk[...].exe
At the time of writing, the domain is blocked by the Browsing Protection feature of our product.
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