Threat Description

S-Bug

Details

Aliases: S-Bug, SatanBug
Category: Malware
Type: Virus
Platform: W32

Summary



S-Bug is a highly polymorphic virus that has been reported to be in the wild in USA and in several other locations.

Virus stays resident in memory occupying 9 KB's of DOS memory. It hooks the following INT 21h functions: 3Dh, 4Bh, and 6Ch. Infected files grow in size between 4k and 5k bytes.

Infected EXE and overlay files may fail to execute correctly. Virus includes string "Satan Bug virus - Little Loc".

The virus will only become resident if the environment variable COMSPEC= is set to point to a file called COMMAND.COM.

S-Bug virus also removes validation codes added to files by McAfee SCAN and CPAV's Immunize function.



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:FruitFly

A related variant. Uses similar encryption, but the actual virus is simpler and non-resident.

See: Natas





Description Created: Mikko Hypponen, F-Secure


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