Summary
Trojan:W32/Swisyn.CAV downloads arbitrary files from a remote server and installs them onto the infected system.
Removal
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
Installation
When first executed, Swisyn.CAV creates copies of itself in the following locations:
- %cwd%\alg.exe - a temporary copy that is deleted after being executed
- %appdata%\Mcirosoft\vmmonitor.exe - a 'permanent' copy
- %appdata%\Microsoft\qud.dtd - empty file
Note that %cwd% is the directory the original malware file was executed in;%appdata% is usually C:\Documents and Settings\All users\Application data.
Activity
Once installed, the trojan attempts to connect to two remote locations and download files from them. The files downloaded by this variant are no longer available for analysis.
Registry
The following registry key is added to enable the malware to be launched at every startup:
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\vmmonitor = "C:\DOCUME~1\ALLUSE~1\APPLIC~1\vmmonitor.exe ~mode =background-check=memory" [launchpoint]
File System Changes
Creates these files:
- %appdata%\Microsoft\qup.dtd
- %appdata%\Microsoft\vmmonitor.exe
Uses these temporary files:
- %cwd%\alg.exe
- %appdata%\Microsoft\qud.dtd
Process Changes
Creates these mutexes:
- redzone
Network Connections
Attempts to download files from:
- https://wc-members.com/1/get.php?un=$GOAT-WXPSP2B_70692199
- https://203.106.203.238/wpad.dat
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