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Worm:Win32/Vobfus.AAH

First posted on 30 May 2014.
Source: Microsoft

Aliases :

There are no other names known for Worm:Win32/Vobfus.AAH.

Explanation :

Threat behavior Worm:Win32/Vobfus.AAH is a member of Win32/Vobfus - a family of worms that spreads via network drives and removable drives. It may also download and execute arbitrary files.

Installation

Worm:Win32/Vobfus.AAH copies itself to the following locations:

• c:\documents and settings\administrator\siukbx\1.exe
• c:\documents and settings\administrator\siukbx\2.exe
• c:\documents and settings\administrator\siukbx\3.exe
• c:\documents and settings\administrator\siukbx\4.exe
• c:\documents and settings\administrator\siukbx\xbkuis.exe

The malware creates the following files on your PC:

• c:\documents and settings\administrator\siukbx\rcx10.tmp
• c:\documents and settings\administrator\siukbx\rcx11.tmp
• c:\documents and settings\administrator\siukbx\rcx12.tmp
• c:\documents and settings\administrator\siukbx\rcx13.tmp
• c:\documents and settings\administrator\siukbx\rcx14.tmp
• c:\documents and settings\administrator\siukbx\rcx15.tmp
• c:\documents and settings\administrator\siukbx\rcx16.tmp
• c:\documents and settings\administrator\siukbx\rcx17.tmp
• c:\documents and settings\administrator\siukbx\rcx18.tmp
• c:\documents and settings\administrator\siukbx\rcx19.tmp
• c:\documents and settings\administrator\siukbx\rcxe.tmp
• c:\documents and settings\administrator\siukbx\rcxf.tmp
• c:\documents and settings\administrator\start menu\programs\startup\xbkuis.lnk

Spreads via€¦

Removable drives
Worm:Win32/Vobfus.AAH can create the following files on targeted drives when spreading:

• :\favourites.lnk
• :\i love you.exe
• :\movies.lnk
• :\music.lnk
• :\naked.exe
• :\password.exe
• :\passwords.lnk
• :\pictures.lnk
• :\private.lnk
• :\search.lnk
• :\secret folder.lnk
• :\sexy.exe
• :\subst.exe
• :\webcam.exe
• :\xbkuis.exe

It also creates an autorun.inf file in the root folder of the removable drive. The file has instructions to launch the malware automatically when the removable drive is connected to a PC with the Autorun feature turned on.
This is a common way for malware to spread. However, autorun.inf files on their own are not necessarily a sign of infection; they are also used by legitimate programs.

Payload

Contacts remote host

Worm:Win32/Vobfus.AAH might contact a remote host at ns1.dnsfor0.com using port 7001. Commonly, malware does this to:

• Report a new infection to its author
• Receive configuration or other data
• Download and run files, including updates or other malware
• Receive instructions from a remote hacker
• Upload data taken from your PC

This malware description was produced and published using automated analysis of file SHA1 4aa811f3dfcb646eba6291fe57068d264ab9bcc3.Symptoms

System changes

The following could indicate that you have this threat on your PC:

• You have these files:
  
  c:\documents and settings\administrator\siukbx\1.exe
  c:\documents and settings\administrator\siukbx\2.exe
  c:\documents and settings\administrator\siukbx\3.exe
  c:\documents and settings\administrator\siukbx\4.exe
  c:\documents and settings\administrator\siukbx\rcx10.tmp
  c:\documents and settings\administrator\siukbx\rcx11.tmp
  c:\documents and settings\administrator\siukbx\rcx12.tmp
  c:\documents and settings\administrator\siukbx\rcx13.tmp
  c:\documents and settings\administrator\siukbx\rcx14.tmp
  c:\documents and settings\administrator\siukbx\rcx15.tmp
  c:\documents and settings\administrator\siukbx\rcx16.tmp
  c:\documents and settings\administrator\siukbx\rcx17.tmp
  c:\documents and settings\administrator\siukbx\rcx18.tmp
  c:\documents and settings\administrator\siukbx\rcx19.tmp
  c:\documents and settings\administrator\siukbx\rcxe.tmp
  c:\documents and settings\administrator\siukbx\rcxf.tmp
  c:\documents and settings\administrator\siukbx\xbkuis.exe
  c:\documents and settings\administrator\start menu\programs\startup\xbkuis.lnk

Last update 30 May 2014

 

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