Disinfection instructions can be found here:
ftp://ftp.f-secure.com/anti-virus/tools/f-zafi.txt
System administrators who are using F-Secure Policy Manager,
can distribute the tool as a JAR package automatically to all
workstations.
System administrators can download the JAR version from:
http://www.f-secure.com/tools/f-zafi.jar
ftp://ftp.f-secure.com/anti-virus/tools/f-zafi.jar
System Infection
When first run, Zafi copies itself to the Windows System
Directory with a random name. The copy is then added to
the registry with a random name under
HKLMSoftware\Microsoft\Windows\CurrentVersion\Run
To disguise its presence the worm opens a random link
from the user's browser history. This tries to make the
user believe that an actual link was opened from the
infected email.
Another copy of the worm is created with a random name
and '.DLL' extension.
The list of addresses the worm collects is written to
several other '.DLL' files in the System Directory.
Email Propagation
Zafi collects email addresses by scanning through files
with the following extensions:
htm
wab
txt
dbx
tbb
asp
php
sht
adb
mbx
eml
pmr
The worms sends infected messages to all addresses that end with
'.hu'.
The infected emails have the following structure:
From: <infected@sender> or <kepeslapok@meglep.hu>
To: <targeted@user>
Subject: kepeslap erkezett!
Tisztelt felhasználó!
Önnek képeslapja érkezett!
A képeslap feladója: Erzsi
A lapot az alábbi cimen tudja megtekinteni:
http//matav.hu/viewcard/index=p4uo5683535GSb0123fhhf578840f0623cv2
vagy a mellékelt internetlink kattintásával.
Üdvözlettel: Matav e-card!
http//www.netezz.matav.hu/
The attachment is named to 'link.matav.hu.viewcard.index42ADR4502HHJeTYWYJDF334GSDEv25546.com'.
Payload
On 1st of May Zafi displays a political message and exits.
The other payload is a routine that terminates processes of
different security applications and system tools:
zonalarm.exe
vbsntw.exe
vbcons.exe
pccguide.exe
outpost.exe
regedit.exe
regedit32.exe
navapw32.exe
pcciomon.exe
navdx.exe
navstub.exe
navw32.exe
nc2000.exe
ndd32.exe
netmon.exe
netarmor.exe
netinfo.exe
nmain.exe
nprotect.exe
ntvdm.exe
ostronet.exe
vsmain.exe
vsmon.exe
vsstat.exe
vbust.exe
mcagent.exe
fsav32.exe
fssm32.exe
fsm32.exe
fsbwsys.exe
fsgk32.exe
dfw.exe
tnbutil.exe
taskmgr.exe
winlogon.exe
fvprotect.exe
Detection for this malware was published on April 19th, 2004
in the following F-Secure Anti-Virus updates:
[FSAV_Database_Version]
Version=2004-04-19_02
Technical Details:
Gergely Erdelyi, April 19th, 2004;
Description Updated:
Alexey Podrezov, June 15th, 2004;
F-Secure Corporation
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