F-Secure
Tools
Worm:W32/Autorun.KK
Summary
A standalone malicious program which uses computer or network resources to make complete copies of itself. May include code or other malware to damage both the system and the network.
Details
File System Changes
Create these directories:
- %programfiles%\Microsoft Common
Network Connections
Attempts to download files from:
- http://blue71.org/[...].php
Attempts to connect to:
- http://pusto-pusto.info/[...].php?
Registry Modifications
Creates these keys:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe
Debugger = "C:\Program Files\Microsoft Common\svchost.exe
Additional Details
Autorun.KK is a worm that is downloaded onto the system from a remote server by a malicious PDF document.
Execution
Once downloaded onto the system, the malicious PDF document will also execute the worm, which will proceed to create the directory %programfiles%\Microsoft Common, then create a copy of itself as %programfiles%\Microsoft Common\svchost.exe.
The worm will then use http://www.microsoft.com to check for the presence of a usable Internet connection and will then attempt to connect to http://pusto-pusto.info/[...].php?, using information on the infected machine as parameters. The website connected to may respond with further download locations, or additional instructions for the malware.
Registry
On execution, the worm will create a registry entry that allows it to execute whenever explorer.exe is launched.
Propagation
Autorun.KK can spread via Windows autorun feature and by copying itself onto other drive media:
Execution
Once downloaded onto the system, the malicious PDF document will also execute the worm, which will proceed to create the directory %programfiles%\Microsoft Common, then create a copy of itself as %programfiles%\Microsoft Common\svchost.exe.
The worm will then use http://www.microsoft.com to check for the presence of a usable Internet connection and will then attempt to connect to http://pusto-pusto.info/[...].php?, using information on the infected machine as parameters. The website connected to may respond with further download locations, or additional instructions for the malware.
Registry
On execution, the worm will create a registry entry that allows it to execute whenever explorer.exe is launched.
Propagation
Autorun.KK can spread via Windows autorun feature and by copying itself onto other drive media:
- [autorun]
open=system.exe
shellexecute=system.exe
shell\Open\command=system.exe
shell=Explore