DR/Autoit.I.1 - Dropper

See also

Summary

Full description

Statistics

Virus:	DR/Autoit.I.1
Date discovered:	21/09/2007
Type:	Dropper
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	215.456 Bytes
MD5 checksum:	69718103c21fd0e647d47c364758f215
IVDF version:	6.39.01.161 - Fri, 21 Sep 2007 10:13 (GMT+1)

General Method of propagation:
   • Mapped network drives

Aliases:
   • Kaspersky: Worm.Win32.AutoIt.i
   • F-Secure: Worm.Win32.AutoIt.i
   • Sophos: W32/SillyFDC-AP
   • Eset: Win32/Autoit.AZ worm
   • Bitdefender: Win32.Worm.Autoit.P

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads files
   • Drops a file
   • Lowers security settings
   • Registry modification

Files It copies itself to the following location:
   • %SYSDIR%\msmsgs.exe

– %WINDIR%\autorun.inf This is a non malicious text file with the following content:
   • [autorun]
     open=system.exe
     shellexecute=system.exe
     shell\Explore\command=system.exe
     shell\Open\command=system.exe
     shell=Explore

It tries to download some files:

– The location is the following:
   • http://ppt.th.gs/**********/bad1.exe
It is saved on the local hard drive under: %SYSDIR%\bad1.exe At the time of writing this file was not online for further investigation.

– The location is the following:
   • http://ppt.th.gs/**********/bad2.exe
It is saved on the local hard drive under: %SYSDIR%\bad2.exe At the time of writing this file was not online for further investigation.

– The location is the following:
   • http://ppt.th.gs/**********/bad3.exe
It is saved on the local hard drive under: %SYSDIR%\bad3.exe At the time of writing this file was not online for further investigation.

Registry One of the following values is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • SYS1="%SYSDIR%\system.exe"
   • SYS2="%SYSDIR%\bad1.exe"
   • SYS3="%SYSDIR%\bad2.exe"
   • SYS4="%SYSDIR%\bad3.exe"
   • Msmsgs="%SYSDIR%\Msmsgs.exe"

The following registry keys are changed:

– HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
   New value:
   • SuperHidden=dword:00000000
   • ShowSuperHidden=dword:00000000
   • HideFileExt=dword:00000001
   • Hidden=dword:00000002

Disable Regedit and Task Manager:
– HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\system
   New value:
   • DisableTaskMgr=dword:00000001
   • DisableRegistryTools=dword:00000001

Various Explorer settings:
– HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
   New value:
   • NoDriveTypeAutoRun=dword:0000005b
   • NoFind=dword:00000001
   • NoFolderOptions=dword:00000001

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• UPX

See a brief description here.

Description inserted by Alexander Neth on Fri, 05 Sep 2008 09:44 (GMT+1)
Description updated by Alexander Neth on Fri, 05 Sep 2008 09:56 (GMT+1)

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