Virus:Worm/MSH.Skowor.A
Date discovered:18/09/2006
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Medium to high
Static file:Yes
File size:17.172 Bytes
MD5 checksum:97221d7994d1f08d8da65c0Cddad43ff
VDF version:6.34.01.122
IVDF version:6.34.01.127 - Tuesday, May 23, 2006

 General Method of propagation:
   • Peer to Peer


Aliases:
   •  Symantec: MSH.Cibyz!int
   •  Mcafee: MSH/Cibyz!p2p
   •  Kaspersky: P2P-Worm.MSH.Skowor.a
   •  TrendMicro: WORM_KIBYZ.A
   •  VirusBuster: MSH.Cybiz.
   •  Bitdefender: Worm.MSH.Skowor.A


Platforms / OS:
   • Windows XP
   • Windows 2003


Side effects:
   • Registry modification


Right after execution the following information is displayed:


 Files It copies itself to the following location:
   • %SYSDIR%\sk0rCzybik.msh



It drops a copy of itself using a filename from a list:
– To: %Kazaa's shared folder% Using one of the following names:
   • Microsoft Windows Vista Cd-Key.txt.msh
   • Windows Vista Update.msh
   • Ad-aware SE Personal Edition 1.06r1.msh
   • Ashampoo Media Player 2.03 install.msh
   • Allround WinZIP Key Generator.msh
   • Talisman Desktop 2.99 Crack.msh
   • Nero Burning Rom 6.6.0.13 Crack.msh
   • Kaspersky KeyGen working.msh
   • Daemon Tools Install + Crack.rar.msh
   • AVP - AntiVirus Key Generator.msh




It overwrites a file.
– %all subdirectories%

File extensions:
   • .msh
   • .ps1
   • .bat
   • .cmd
   • .log
   • .ini
   • .txt
   • .js
   • .html

 Registry The following registry keys are changed:

Internet Explorer's start page:
– [HKCU\Software\Microsoft\Internet Explorer\Main]
   Old value:
   • "Start Page"="%user defined settings% "
   • "Window Title"="Microsoft Internet Explorer"
   New value:
   • "Start Page"=""
   • "Window Title"="Infected by a poly ps worm"

Various Explorer settings:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   Old value:
   • "Hidden"=dword:00000002
   • "HideFileExt"=dword:00000000
   New value:
   • "Hidden"=dword:00000000
   • "HideFileExt"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion]
   Old value:
   • "RegisteredOrganization"="%user defined settings% "
   • "RegisteredOwner"="%user defined settings% "
   New value:
   • "RegisteredOrganization"="Infected Poly"
   • "RegisteredOwner"="sk0rCzybik"

Description inserted by Alexandru Tudor on Monday, September 18, 2006
Description updated by Andrei Ivanes on Friday, October 13, 2006

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