Summary
Trojan-Dropper:OSX/Revir.A drops a downloader component that downloads a backdoor program onto the system, while camouflaging its activity by opening a PDF file to distract the user.
Removal
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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:
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Technical Details
Trojan-Dropper:OSX/Revir.A drops a PDF file in the /tmp folder, then opens it to distract the user from noticing any other activity occuring:
Screenshot of a PDF file dropped by Trojan-Dropper:OSX/Revir.A.
The PDF file contains Chinese-language text related to political issues, which some users may find offensive.
Note that the PDF file in the screenshot above uses the name 'trojan.pdf'. The PDF file will actually use the same name as the trojan-dropper's binary file, which is usually saved to the /Users/%user%/Downloads or /User/%user%/Documents folders.
Activity
In the background, the malware will drop and execute the following downloader component (detected as Trojan-Downloader:OSX/Revir.A):
- /tmp/host
This file downloads and executes a file from the following remote location:
- h t t p://tarmu.narod.ru/[...]
The downloaded file is also saved as:
- /tmp/updtdata
As of this writing, the downloaded file is detected as Backdoor:OSX/Imuler.A. Our Browsing Protection blocks the download server hosting the file.
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