F-Secure Virus Descriptions : SVC

NAME:	SVC
ORIGIN:	USSR
SIZE:	1689
TYPE:	Stealth Resident COM/EXE-files
REPAIR:	Yes

This is the first Russian "stealth" virus. It has not been analyzed yet, but it contains the text string:

                      (c) 1990 by SVC,Vers. 4.0

A 1740 byte variant with the same message is also known.

VARIANT: SVC 3.1

This earlier version is somewhat shorter, only 1064 bytes. One 1228 byte variant might be even older, but it does not contain a version number.

VARIANT: SVC 5.0

A more recent, improved version of the virus - 3103 bytes long.

VARIANT: SVC 6.0

Yet another variant, which is able to infect MBR's as well.

VARIANT: SVC.2936

This variant activates on June 4th and tries to overwrite part of the hard drive. It was reported to be in the wild in Mosambik in 1996.