BatMan_II

Classification

Malware

Virus

W32

BatMan_II

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

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

Find out more

Knowledge Base

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User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

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.