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
Trojan-Downloader:JS/Advedo is part of a multi-stage malware that is injected into legitimate websites. When a visitor arrives at the compromised website, the malware uses several scripts to force a file download onto the visitor's computer.
The various scripts used are written in JScript and VBS.
Activity
The first part of this script Trojan is injected into a legitimate website and placed after the website's closing HTML tag. This script allows the execution of another script from the following predetermined website:
- https://qzh.txshi.com/
The second part of the malware inserts an iframe into the website. The site inserted is still contained from the same domain.
The third part of the malware (a combination of JScript and VBS) downloads a file from the following website:
- https://qzh1.txshi.com/
At the time of analysis, the downloaded file is no longer available.
If the download is successful, the file is saved into the temporary folder of the system as:
- nettool.exe
The file ~net.bat is then created in the temporary folder and is used to execute the downloaded file.
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