Trojan-Downloader

Threat description

Details

Category: Malware
Type: Trojan-Downloader
Platform: W32

Summary

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



Removal

Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming 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 Knowledge Base on the F-Secure Community site for further assistance.

Security programs will sometimes unintentionally identify a clean program or file as malicious if its code or behavior is similar to a known harmful program or file. This is known as a False Alarm or False Positive (FP).

For example, 'tmp.edb' and other '.edb' files stored at the location 'C:\WINDOWS\SoftwareDistribution\DataStore\Logs\' may be unintentionally detected as malicious by various security programs.

Checking for a fix

In most cases, a False Positive is fixed in a subsequent database release; updating your F-Secure security product to use the latest database is enough to resolve the issue. If you suspect a detected file may be a False Positive, you can check by first updating your F-Secure security product to use the latest detection database updates, then rescanning the suspect file.

Send a sample to F-Secure Labs

After checking, if you believe the file or program is still incorrectly detected, you can submit a sample of it to F-Secure Labs for analysis and correction:

Exclude a known safe file from further scanning

If you are positive that the suspect file is safe and you want to continue using it, you can exclude it from further scanning by the F-Secure security product:

You may also refer to the Knowledge Base on the F-Secure Community site for more assistance.

Also

Microsoft provides enterprise-level instructions for excluding files from scanning by antivirus software:



Technical Details

A Trojan-Downloader is a type of trojan that installs itself to the system and waits until an Internet connection becomes available to connect to a remote server or website in order to download additional programs (usually malware) onto the infected computer.

Trojan-Downloaders are often distributed as part of the payload of another malware, such as a Trojan-Dropper. Trojan-Downloaders may also be distributed as a file attachment to spam e-mails. The attached programs are typically labelled using legitimate-sounding program or document names, such as 'invoice' or 'accounts.exe', as a simple form of social engineering. On opening the file attachment, the Trojan-Downloader is installed.

Once its primary download/execution routine is completed, it may also proceed to a secondary payload routine.

For representative examples of Trojan-Downloaders, please see the following descriptions:






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