Threat Description

Shell

Details

Aliases: Shell, Tentacle_II
Category: Malware
Type:
Platform: W32

Summary


This virus was found in the wild in June 1996 in USA, UK, Australia, Norway and New Zealand. It has possibly been distributed over the internet several times.



Removal


Automatic action

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

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.



Technical Details


A known infection happened on the 3rd of August, 1996, when an infected screen saver called PCTRSHOW.ZIP was posted to the following newsgroups:

alt.sex.pictures   alt.binaries.pictures.erotica   alt.binaries.pictures.erotica.blondes   alt.binaries.pictures.erotica.breasts   alt.binaries.pictures.erotica.cheerleaders   alt.binaries.pictures.erotica.female   alt.binaries.pictures.erotica.lesbians   alt.binaries.pictures.erotica.oral   alt.binaries.pictures.erotica.orientals   alt.binaries.pictures.erotica.redheads   alt.binaries.pictures.erotica.teen   alt.binaries.pictures.erotica.teen.female   alt.binaries.pictures.erotica.voyeurism   alt.binaries.pictures.erotica.young   alt.binaries.pictures.groupsex   alt.binaries.pictures.erotica.latina   alt.binaries.pictures.celebrities   alt.binaries.pictures.girls  

Do note that there are also clean copies of PCTRSHOW in circulation.

The virus infect only Windows 3.x executables (NE), and it does it without changing the executable entry point. This is an unusual infection method and was first introduced in this virus.

When executed, Shell.10634 searches the directory tree for suitable files to infect. Only EXE and SCR (screen saver) files can get infected.

Also 32bit Win95 and WinNT executables can be infected by the virus, but these files are unable to spread the infection further. Shell not stay resident in memory.

This virus activates by dropping a GIF file, which contains a picture of a Tentacle and text:

  I'm the Tentacle Virus!  

The author of this virus also wrote the Tentacle and Tentatrickle viruses, which are technically quite different from this virus. See: Tentacle





Description Details: Mikko Hypponen, F-Secure


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