Threat Description

Linux/Bliss

Details

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

Summary


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()         /etc/hosts.equiv         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         /usr/spool/news         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:

E8ABD8FFFFC20000363465643134373130363532  

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



Removal


Automatic action

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

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

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

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.







Description Details: Mikko Hypponen, F-Secure


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