Virus:TR/Scar.capr
Date discovered:28/04/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:96.768 Bytes
MD5 checksum:9b4fdf7194e83f00564bbb81ae7b8590
IVDF version:7.10.06.229 - Wednesday, April 28, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Bitdefender: Trojan.Generic.3854167
   •  Panda: Trj/Sinowal.XAO
   •  Eset: Win32/Spy.Zbot.UN


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


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\sdra64.exe
   • %drive%\%executed file%



The following files are created:

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

– %SYSDIR%\lowsec\user.ds
– %SYSDIR%\lowsec\local.ds
– %SYSDIR%\lowsec\user.ds.lll



It tries to download a file:

– The location is the following:
   • http://www.your-up-search.net/up-date/**********

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\software\microsoft\windows nt\currentversion\winlogon]
   • "userinit"="%SYSDIR%\userinit.exe,%SYSDIR%\sdra64.exe,"



The following registry keys are added:

– [HKEY_USERS\S-1-5-19\software\microsoft\internet explorer\main]
   • "Start Page"=""

– [HKEY_USERS\S-1-5-19\software\microsoft\windows nt\currentversion\
   network]
   • "UID"="%computer name%_001A9655"

– [HKLM\software\microsoft\windows nt\currentversion\network]
   • "UID"="%computer name%_001A89C3"

– [HKEY_USERS\S-1-5-20\software\microsoft\internet explorer\main]
   • "Start Page"=""

– [HKEY_USERS\S-1-5-20\software\microsoft\windows nt\currentversion\
   network]
   • "UID"="%computer name%_001A930A"

– [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows NT\CurrentVersion\
   Winlogon]
   • "ParseAutoexec"="1"

– [HKEY_USERS\S-1-5-19\Software\Microsoft\Windows NT\CurrentVersion\
   Winlogon]
   • "ParseAutoexec"="1"

– [HKEY_USERS\S-1-5-20\Software\Microsoft\Windows NT\CurrentVersion\
   Winlogon]
   • "ParseAutoexec"="1"

 Injection – It injects itself as a remote thread into a process.

    Process name:
   • winlogon.exe



– It injects itself as a remote thread into a process.

    Process name:
   • svchost.exe



– It injects itself as a remote thread into a process.

It is injected into all processes.


 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, August 24, 2010
Description updated by Petre Galan on Tuesday, August 24, 2010

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