Worm/Dumaru.K.DLL - Worm

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Full description

Alias:	TrojanSpy.Win32.SilentLog.a, W32/Dumaru.dll, Keylogger.Trojan
Type:	Worm
Size:	34,304 Bytes
Origin:
Date:	00-00-0000
Damage:	Sent by email.
VDF Version:
Danger:	Low
Distribution:	Low

DistributionIt collects email adresses from files of type: .htm, .wab, .html, .dbx, .tbb and .abd. It uses its own SMTP engine to spread by email. The email has the following structure:

From: "Microsoft" %security@microsoft.com%
Subject: Use this patch immediately !
Body: Dear friend , use this Internet Explorer patch now! There are dangerous virus in the Internet now! More than 500.000 already infected!
Attachment: Patch.exe

Technical DetailsWhen activated, Worm/Dumaru.K.DLL copies itself as:
%WinDir%\Dllreg.exe
%SystemDIR%\Load32.exe
%SystemDIR%\Vxdmgr32.exe
%Startup%\Rundllw.exe

It creates %WinDIR%\Windrive.exe (8,192 Bytes), which is an IRC Trojan. The worm connects to a predefined IRC server, for receiving on a special port its author's instructions.

The worm creates %WinDIR%\Winload.log, for saving the collected addresses.
It makes the following autostart registry entry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run "load32"="%WinDIR%\load32.exe"

It also changes the following entry:
HKEY_Current_User\Software\Microsoft\WindowsNT\CurrentVersion\Windows "Run"="C:\%WinDIR%\dllreg.exe"

It changes the [windows] section of win.ini file into:
[windows]run=%WinDIR%\dllreg.exe
and the [boot] section, into:
[boot]shell=explorer.exe %SystemDIR%\vxdmgr32.exe

The worm tries to infect all .exe files on drives C: to Z:.
It listens on TCP port 10000 for further instructions:
mkd: "Create a directory on the infected machine"
rmd: "Remove directory on the infected machine"
port: "Change the port to the port specified"
and on TCP port 1001 for:
!exec: "Execute program on the infected machine"
!cdopen: "Open the CD-ROM on the infected machine"
!sndplay: "Play a sound on the infected machine"

It tries to collect all clipboard information into %WinDIR%\Rundllx.sys.
The file %WinDIR%\Guid32.dll is used for entries into %WinDIR%\Vxdload.log.
Then, it looks for .kwm files, saves their contents in %Windir%\Rundlln.sys.

See a brief description here.

Description inserted by Crony Walker on Tue, 15 Jun 2004 14:00 (GMT+1)

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