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Virus:RKIT/37704.A
Date discovered:28/06/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:64.512 Bytes
MD5 checksum:6782a7b800d2be2064e6ca9377d704f6
IVDF version:7.10.08.210 - Monday, June 28, 2010

 General Method of propagation:
   • Messenger


Aliases:
   •  Bitdefender: Rootkit.37704
   •  Panda: Bck/Oscarbot.YO
   •  Eset: IRC/SdBot


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


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

 Files It copies itself to the following locations:
   • %WINDIR%\jusched.exe
   • %WINDIR%\jusched.exb



It deletes the initially executed copy of itself.




It tries to execute the following files:

– Filename:
   • net stop MsMpSvc


– Filename:
   • net1 stop MsMpSvc


– Filename:
   • netsh firewall add allowedprogram 1.exe 1 ENABLE


– Filename:
   • %WINDIR%\jusched.exe


– Filename:
   • net stop wuauserv


– Filename:
   • sc config wuauserv start= disabled


– Filename:
   • net1 stop wuauserv

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Java developer Script Browse"="%WINDIR%\jusched.exe"

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\
   Install\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Java developer Script Browse"="%WINDIR%\jusched.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Java developer Script Browse"="%WINDIR%\jusched.exe"



It creates the following entry in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%executed file%"="%WINDIR%\jusched.exe:*:Enabled:Java
      developer Script Browse"

 Messenger It is spreading via Messenger. The characteristics are described below:

– Yahoo Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

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

Server: 66.225.24**********.182
Port: 2345
Channel: #!gf!
Nickname: NEW-[USA|00|P|%number%]

 Miscellaneous Accesses internet resources:
   • http://www.cpal**********.com/widget-report-abuse.php
   • http://www.cpal**********.com/widget-help.php


Mutex:
It creates the following Mutex:
   • Micro Upe

 File details Programming language:
The malware program was written in MS Visual C++.


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, November 30, 2010
Description updated by Petre Galan on Tuesday, November 30, 2010

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