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Virus:DR/Autoit.RL
Date discovered:14/10/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:927.495 Bytes
MD5 checksum:e26110b93d3e2b047f11cb9b3158cc35
IVDF version:7.01.06.109 - Wednesday, October 14, 2009

 General Method of propagation:
Autorun feature


Aliases:
   •  Mcafee: W32/Renocide.c virus
   •  Sophos: W32/Autoit-HA
   •  Eset: Win32/AutoRun.Autoit.BL
   •  Bitdefender: Trojan.Generic.2590538


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


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

 Files It copies itself to the following locations:
   • %SYSDIR%\csrcs.exe
   • %drive%\mijdwm.exe



It deletes the initially executed copy of itself.



It deletes the following file:
   • %TEMPDIR%\suicide.bat



The following files are created:

– A file that is for temporary use and it might be deleted afterwards:
   • C:\%random character string%

%SYSDIR%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%TEMPDIR%\suicide.bat



It tries to download some files:

The locations are the following:
   • http://pimpumpam.orz.hm:48753/**********
   • http://lanlenio.or.tp:48753/**********
   • http://juirjeju.or.tp:48753/**********
At the time of writing this file was not online for further investigation.

 Registry The following registry keys are added:

[HKLM\SOFTWARE\Microsoft\DRM\amty]
   • "dreg"="408406541BC5BBE4DC197A2A0C46B9ACF2F90D96B151D7C7BCBD177641EE95F562E634D70EB70FB65FC8FBF0EC31276D8626D05B1ED70CC881A48DA07A7E649B"
   • "exp1"="408406541BC5BBE4DC197A2A0C46B9ADF2F90D96B151D7C7BCBD177641EE95F162E634D70EB70FB65FC8FBF0EC312619"
   • "fix"=""
   • "fix1"="1"
   • "ilop"="1"
   • "regexp"="%number%"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run]
   • "csrcs"="%SYSDIR%\csrcs.exe"



The following registry keys are changed:

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   New value:
   • "Shell"="Explorer.exe csrcs.exe"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000
   • "SuperHidden"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   New value:
   • "GlobalUserOffline"=dword:0x00000000

 Network Infection IP address generation:
It creates random IP addresses while it keeps the first three octets from its own address. Afterwards it tries to establish a connection with the created addresses.

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

Description inserted by Petre Galan on Tuesday, December 15, 2009
Description updated by Petre Galan on Tuesday, December 15, 2009

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