Trojan:W32/Swisyn.CAV

Classification

Category :

Malware

Type :

Trojan

Platform :

W32

Aliases :

Trojan:W32/Swisyn.CAV, Trojan.Win32.Swisyn.cav, Trojan:Win32/Chksyn.gen!A (Microsoft)

Summary

Trojan:W32/Swisyn.CAV downloads arbitrary files from a remote server and installs them onto the infected system.

Removal

1. Ensure vmmonitor.exe is not running (use Task Manager to end its process).
2. Delete the files vmmonitor.exe and qud.dtd
3. Delete this Registry key:
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\vmmonitor

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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