Classification

Category: Malware

Type: -

Aliases: Shell, Tentacle_II

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

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

Knowledge Base

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About the product

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Submit a sample

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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