Threat Description

BatMan_II

Details

Aliases:BatMan_II, BatMan_II
Category:Malware
Type:Virus
Platform:W32

Summary



During execution of an infected file the virus decrypts itself by using 5 different decryptors. However, it is not polymorphic. The virus uses several anti-debugging tricks like using INT 1,3,9 as decryptors and direct port commands.

After that it hooks INT 13h, 21h and stays memory resident. BatMan_II.3372 is a stealth virus, it changes the DOS file time stamp to 62 seconds. During execution the virus searches for *.EXE files, then writes itself to the end of them.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details



BatMan_II sometimes corrupts files, due to a bug in it's infection routine. The corrupted files halt or reboot the system and they will not work after the disinfection either.

The virus contains a few text strings, but they are encrypted:

Bat Man II
*.EXE
COMMAND
\NAWIAT ( --> backwards \TAIWAN )

The virus has shorter variants, too.

BatMan_II was found in the wild in USA in August 1996.





Technical Details: Peter Szor, F-Secure, 1996


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