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Virus:TR/Scar.aywk
Date discovered:20/12/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:66.560 Bytes
MD5 checksum:13de040017144a6276172d08bfd1e7f4
IVDF version:7.10.02.23 - Sunday, December 20, 2009

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Mcafee: W32/Slenping
   •  Panda: W32/OscarBot.XY
   •  Eset: Win32/AutoRun.IRCBot.CX
   •  Bitdefender: Worm.Pushbot.G


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


Side effects:
   • Drops malicious files
   • Registry modification
   • Third party control

 Files It copies itself to the following locations:
   • %HOME%\Application Data\afd.exe
   • %drive%\Folder\SubFolder\file.exe



The following files are created:

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

 Registry To each registry key one of the values is added in order to run the processes after reboot:

–  [HKCU\Software\Microsoft\Windows NT\CurrentVersion\Terminal Server\
   Install\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Cftmon32"="%HOME%\Application Data\afd.exe"

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Cftmon32"="%HOME%\Application Data\afd.exe"



The following registry key is changed:

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   New value:
   • "%executed file%"="%executed file%:*:Enabled:Cftmon32"

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

Server: one.af**********.com
Port: 22
Channel: #!stdin
Nickname: [USA|00|P|%number%]

 Backdoor The following port is opened:

– freebieslounge.com on UDP port 44500

 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, March 16, 2010
Description updated by Petre Galan on Tuesday, March 16, 2010

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