Trojan-Dropper:OSX/Revir.B

Classification

Malware

Trojan-Dropper

OSX

Trojan-Dropper:OSX/Revir.B, Trojan-Dropper:OSX/Revir.B

Summary

Trojan-Dropper:OSX/Revir.B drops and executes a backdoor program detected as Backdoor:OSX/Imuler.A, while camouflaging its activity by opening a JPG file to distract the user.

Removal

Automatic action

The F-Secure security product will automatically remove the file.

Suspect a file is incorrectly detected (a False Positive)?

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

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  • Submit a sample

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    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

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    Note You need administrative rights to change the settings.

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Submit a sample

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Technical Details

Trojan-Dropper:OSX/Revir.B drops a JPG file in the /tmp folder, then opens it to distract the user from noticing any other ongoing activity.

Screenshot of a JPG file dropped by Trojan-Dropper:OSX/Revir.B.

Note that the JPG file in the screenshot above uses the name 'trojan.jpg'. The JPG file will actually use the same name as the trojan-dropper's binary file.

Activity

In the background, the malware will drop and execute a backdoor program (detected as Backdoor:OSX/Imuler.A):

  • /tmp/host