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Virus:W32/Chir.B
Date discovered:30/08/2005
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Medium to high
Static file:No
IVDF version:6.31.01.194 - Tuesday, August 30, 2005

 General Methods of propagation:
   • Email
   • Local network


Aliases:
   •  Symantec: W32.Chir.B@mm
   •  Mcafee: W32/Chir.b@MM virus
   •  Kaspersky: Email-Worm.Win32.Runouce.b
   •  F-Secure: Email-Worm.Win32.Runouce.b
   •  Sophos: W32/Chir-B
   •  Panda: W32/Chir.B
   •  Grisoft: Win32/Chir.B@mm
   •  Eset: Win32/Chir.B worm
   •  Bitdefender: Win32.Parite.B


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops a malicious file
   • Uses its own Email engine

 Special detection Version history:
The following engine update was released in order to enhance detection:

   •  7.09.04.22/8.02.04.22   ( 20/07/2010 )

 Files It copies itself to the following location:
   • %SYSDIR%\runouce.exe



The following file is created:

– MIME encoded copy of itself:
   • Readme.eml

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Runonce"="%SYSDIR%\runouce.exe"

 File infection Method:

This direct-action infector actively searches for files.

 Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:


From:
The sender address is spoofed.


To:
– Email addresses found in specific files on the system.


Subject:
The following:
   • %username from sender's email address% is coming!



Attachment:
The filename of the attachment is:
   • PP.exe

The attachment is a copy of the malware itself.

 Miscellaneous Mutex:
It creates the following Mutex:
   • ChineseHacker-2


String:
Furthermore it contains the following string:
   • Net Send * My god! Some one killed ChineseHacker-2 Monitor

Description inserted by Thomas Wegele on Thursday, November 13, 2008
Description updated by Andrei Ivanes on Thursday, December 23, 2010

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