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F-Secure Malware Information Pages: Trojan-Downloader:W32/Injecter.GX

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| Radar |
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Summary
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Injecter.GX is a trojan-downloader.
A trojan-downloader is usually a standalone program that attempts to silently download and run other files from remote Web and FTP sites. |
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Disinfection
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Trojan-Downloader |
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Detailed Description
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Injecter.GX attempts to downloads files from:
- http://88.255.[Removed]/e521.gif
- http://88.255.[Removed]/e514.gif
- http://88.255.[Removed]/e509.gif
It drops the downloaded files to the following location:
- %windir%\system32\cdmk.dll
- %temp%\dm4.exe
Injecter.GX also drops a DLL file from itself to the default temp folder which uses a name of tmp2.tmp. The file appears to be the downloader component itself.
The malware also creates a temp file called _vdmstmsnd_.dat.
It also attempts to send out information by performing the following command:
- HTTP GET http://85.255.[Removed]/count.php?u=346&e=521&r=1
It searches for a process named teatimer.exe. It will attempt to terminate the process if discovered.
The malware uses a mutex named STDP117.
To ensure that the malware starts with Windows, it copies the malware file to:
- C:\Documents and Settings\All Users\Start Menu
\Programs\Startup\msupd[number].exe Note: [number] is random.
The malware creates the following registry entries:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\PUID
UID = 6727150054040000de564349 (Seems to be some kind of hash of the victim's computer.) UID2 = trojan.exe (Filename of the malware on execution.) - HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\PUID\set
thPCvzSYyScLKSRaW3l3jquJRD382MNqz3P4yEfx = "mult" thPCvzSYyScLKSRaW3l3jquJRD382MNqzHb4yEfx = "mult" - HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
\Session Manager PendingFileRenameOperations =" \??\C:\Samples\trojan.exe.1 \??\C:\Documents and Settings\All Users\Start Menu\ Programs\Startup\msupd43616.exe" |
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Detection
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F-Secure Anti-Virus detects this malware with the following updates: [FSAV_Database_Version] Version = 2008-02-27_01.
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F-Secure Corporation |
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Last Modified: February 28, 2008
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