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Virus:TR/Scar.bzst
Date discovered:02/05/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:80.982 Bytes
MD5 checksum:ca6eaac619a5538bc88969426cce35ea
IVDF version:7.10.07.17 - Sunday, May 2, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Bitdefender: Trojan.Agent.WDCR
   •  Panda: Trj/Scar.J
   •  Eset: Win32/AutoRun.IRCBot.EM


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


Side effects:
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %HOME%\Application Data\svchosts.exe
   • %drive%\SYSTEM.EXE
   • %HOME%\Application Data\rssms32.exe



The following file is created:

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




It tries to executes the following files:

– Filename:
   • %malware execution directory%\%executed file%


– Filename:
   • "%HOME%\Application Data\svchosts.exe"

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Microsoft Corp"="%HOME%\Application Data\svchosts.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Microsoft Corp"="%HOME%\Application Data\svchosts.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run]
   • "Microsoft Corp"="%HOME%\Application Data\svchosts.exe"



The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system]
   New value:
   • "EnableLUA"=dword:0x00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   New value:
   • "winlogon"="%HOME%\Application Data\svchosts.exe"

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: tox**********.info
Port: 45351
Channel: #RogUe#
Nickname: {USA}{XP}{00}%number%

Description inserted by Petre Galan on Friday, August 6, 2010
Description updated by Petre Galan on Thursday, August 12, 2010

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