Summary
Backdoor:OSX/Imuler.B contacts a remote server for instructions; it may then steal files or capture a screenshot of the infected computer system, which is later forwarded to the remote server.
Removal
The F-Secure security product will automatically remove the file.
- Open Activity Monitor
- Select ScheduledSync then click Quit Process
- Delete the following files:
- ~/library/LaunchAgents/ScheduledSync
- ~/library/LaunchAgents/ScheduledSync.plist
- ~/library/.confback
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 updatesFirst, check if your F-Secure security program is using the latest updates, then try scanning the file again.
- Submit a sampleAfter 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 scanningIf 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
Installation
- ~/library/LaunchAgents/ScheduledSync
- ~/library/LaunchAgents/ScheduledSync.plist
- ~/library/.confback
Network Connections
- http://%server%/cgi-mac/whatismyip.cgi
- http://%server%/cgi-mac/2wmthetime.cgi
- http://%server%/cgi-mac/2wmrecvdata.cgi
- Internal IP
- External IP
- Username of the infected user
- Time of last execution
- Kernel version of the infected host
- http://%server%/cgi-mac/2wmcheckdir.cgi
- http://%server%/cgi-mac/2wmsetstatus.cgi
Backdoor
- http://%server%/users/%botid%/xnocz1
- %botid% - Is composed of:%user%%pad%%mac%
- %user% - Are the first 8 characters of the username of the infected user ("XXXXXXXX" if username is longer than 8 characters)
- %pad% - Is a series of "X" characters to make %botid% 20 characters long
- %mac% - Is the MAC address of the machine
- Download additional files
- Execute files on the infected host
- Collect system information then upload to the C&C
- Collect files to an archive, then upload it to the C&C server
- Capture an image of the computer screen, then upload it to the C&C
- http://%server%/cgi-mac/2wmdelfile.cgi
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