Threat Description



Aliases: Linux/Bliss, Linux/Bliss, Bliss, Linux virus, Unix virus, HLLO.17892
Category: Malware
Type: Virus
Platform: Linux


This virus spreads only under Linux operating system, infecting Elf-style executables. Found in the wild in February 1997, Bliss is the second known Linux virus (first being Staog).

Bliss locates binaries with write access and overwrites them with it's own code. When an infected file is executed, the original program does not gain control at all. However, it is still possible to clean infected files.

Bliss does not try to subvert any additional user rights, but it does have some basic worm-like features, looking for new hosts to infect via the /etc/hosts.equiv file.

Bliss contains several text strings, including:

dedicated to rkd
        infected by bliss
        skipping, infected with same vers or different type
        replacing older version
        replacing ourselves with newer version
        infect() returning success
        successfully (i hope) disinfected
        rsh%s%s %s 'cat>%s;chmod 777 %s;%s;rm -f %s'
        doing do_worm_stuff()
        Compiled on Sep 28 1996 at 22:24:03
        Written by electric eel.
        help? hah! read the source!
        bliss was run %d sex ago, rep_wait=%d
        GCC: (GNU) 2.7.2.l.2

Bliss does contain potentionally harmful code, but it is unclear if this is executed or not.

Bliss can be detected by searching all binaries for the following hex search string:


Bliss will disinfect itself if an infected binary is executed with the --bliss-disinfect-files-please switch.


Automatic Disinfection

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

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

Description Created: Mikko Hypponen, F-Secure


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