Threat Description

Horty

Details

Aliases: Horty, Kagra, Atzi, VBS/Horty, VBS/Horty.A@mm
Category: Malware
Type: Worm
Platform: VBS

Summary



Horty is a worm written in Visual Basic Script.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details




Variant:Horty.A

Horty.A spreads in a emails with the following characteristics:

Subject: Jenna Jameson pornostar free
  superf**k+photo addresses
 Body:
 Do you wanna see super pornostar,Jenna Jameson,
 in a special superf**k?Double click on the
 attachment of this mail,and get also some
 interesting sex-sex-sex addreses...
 Attachment: Jenna-Jameson-free-superf**k.txt.vbs

When a user executes the attached file, the virus shows a text using Notepad. Then it sends itself to all recipients listed in Outlook's Contacts folder.

The worm creates its copies in Windows, Windows System and Temp directories respectively kernel32.vbs, alexia.txt.vbs, Natasa.txt.vbs

It also creates copies of itself using the following file names:

c:\x-f**k.TXT.vbs
 a:\kissme.TXT.vbs
 b:\kissme.TXT.vbs
 a:\mydick.TXT.vbs
 b:\mydick.TXT.vbs
 a:\drdick.TXT.vbs
 b:\drdick.TXT.vbs
 a:\aliens.TXT.vbs
 b:\aliens.TXT.vbs
 a:\thebar.TXT.vbs
 b:\thebar.TXT.vbs
 a:\ufoxxx.TXT.vbs
 b:\ufoxxx.TXT.vbs
 etc.

The worm might sends out 4 times from one infected machine. To do this the virus modifies the registry 'HKLM\SOFTWARE\WUpdat' using its value as a marker.

If the date is 12 of May, the virus shows a message box:

Your PC has been hacked by KaGra[ATZI virus ver 2.1]
        From the KaGra

If the date is 13 of May, Horty.A tries to delete Windows folder.

F-Secure Anti-Virus detects Horty worm using the heuristics.





Technical Details: Katrin Tocheva, F-Secure Corp.; April 24th, 2002


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