Trojan-Downloader:OSX/Jahlev.A
Summary
Trojan-Downloader:OSX/Jahlev.A entices the user into downloading a fake video codec, which supposedly will solve an Active X object error. The downloaded file is a mountable disk image (DMG) file used by Mac OS X to install applications, and contains an installer package named "install.pkg".
Removal
The F-Secure security product will automatically remove the file.
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
Execution
On installing the DMG file, the following image is displayed, as the trojan cleverly camouflages itself as a MacAccess installer:
Unbeknown to the victim, the trojan will install a file named "AdobeFlash" to "/Library/Internet Plug-Ins". The AdobeFlash is a copy of the preinstall/ preupgrade files from the DMG file's installer package, install.pkg, and is a script that appears as:
The output of the script is a file named "withlove", which is able to perform tasks in the backgrounds at regular intervals, while remaining hidden from the victim.The output file also contains a script that must be decoded to determine the task being performed. The task is contained in a file named "jah", and its purpose appears to be to connect to the URL: 94.102.60.[...], in order download and execute a file.As of this writing however, no files are available for download from this link.
)
Protect your devices from malware with F‑Secure Total
Protecting your devices from malicious software is essential for maintaining online security. F‑Secure Total makes this easy, helping you to secure your devices in a brilliantly simple way.
- Award-winning antivirus and malware protection
- Online browsing, banking, and shopping protection
- 24/7 online identity and data breach monitoring
- Unlimited VPN service to safeguard your privacy
- Password manager with private data protection
More Support
Community
Ask questions in our Community .
User Guides
Check the user guide for instructions.
Submit a Sample
Submit a file or URL for analysis.