FunLove (aka Fun Loving Criminals) is a benign memory resident parasitic Win32 virus. It affects PE EXE files on local and network drives. Because of its network spreading
ability, the virus can infect the local network from one infected
workstation, in the case that the network access permission allows for the writing of this
The virus contains the following text strings:
~Fun Loving Criminal~
When an infected file is run, the virus creates a FLCSS.EXE file in the
Windows system directory, writes its “pure” code to there and runs this
file. This virus “dropper” (FLCSS.EXE file) has a Win32 PE format and is
executed by the virus as a hidden Windows application (under Win9x) or as a
service (under WinNT), and the infection routine takes control.
In case an error has occurred while creating the dropper file (when the virus is
run from an infected file), the virus runs the infection routine from its example in the infected host file. The file searching and infection
process is run in the background as a “thread,” and as a result, the host
program is executed with no “visible” delays.
The infection routine scans all local drives from C: till Z:, then looks
for network resources, scans subdirectory trees there and infects PE files
that have a .OCX, .SCR or .EXE name extension. While infecting a file, the
virus writes its code to the end of the file to the last file section and
patches its entry routine with a “JumpVirus” instruction. The virus checks
file names and does not infect the files: ALER*, AMON*, _AVP*, AVP3*,
AVPM*, F-PR*, NAVW*, SCAN*, SMSS*, DDHE*, DPLA*, MPLA*.
The virus is related to the Bolzano virus family and patches
the NTLDR and WINNTSystem32ntoskrnl.exe files in a similar way the
“Bolzano” virus does. The patched files should be restored from backup.