Worm:W32/Autorun.KK

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

File System Changes

Create these directories:

• %programfiles%\Microsoft Common

Network Connections

Attempts to download files from:

• https://blue71.org/[...].php

Attempts to connect to:

• https://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