Summary
Trojan-Downloader:W32/Exchanger variants download additional malicious software onto the infected system.
Removal
To manually remove a Trojan-Downloader:W32/Exchanger infection, perform the following steps:
- Open the Windows Task Manager by pressing the Ctrl + Alt + Delete keys and click the Task Manager button.
- From the list of running processes, find CbEvtSvc.exe and then click the End Process button.
- You may close the Task Manager once the malicious process is terminated.
- From the Windows Start Menu, select Run, type regedit into the "Open:" field and then click OK.
- From the Registry Editor, locate and delete the following keys if present:
- HKLM\SYSTEM\CurrentControlSet\Services\CbEvtSvc
- HKLM\SYSTEM\ControlSet001\Services\CbEvtSvc
- HKLM\SYSTEM\ControlSet002\Services\CbEvtSvc
- Delete the file called CbEvtSvc.exe located in the C:\WINDOWS\system32\ folder.
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
File System Changes
- %windir%\system32\CbEvtSvc.exe
Process Changes
- %windir%\system32\CbEvtSvc.exe
Registry Modifications
- HKLM\System\CurrentControlSet\Services\CbEvtSvc Type = 00000010 Start = 00000002 ErrorControl = 00000001 ImagePath = %SystemRoot%\System32\CbEvtSvc.exe -k netsvcs DisplayName = CbEvtSvc ObjectName = LocalSystem Opt =
- HKLM\System\CurrentControlSet\Services\CbEvtSvc\Security Security = \x01\x00\x14\x80\x90\[...]
- HKLM\System\CurrentControlSet\Services\CbEvtSvc
- HKLM\System\CurrentControlSet\Services\CbEvtSvc\Security
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