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 Disinfection

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

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



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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