Zafi.A

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 felhasznlo! annek kepeslapja erkezett! A kepeslap feladoja: Erzsi A lapot az alibbi cimen tudja megtekinteni: http//matav.hu/viewcard/index=p4uo5683535GSb0123fhhf578840f0623cv2 vagy a mellekelt internetlink kattintisival. 'dvzlettel: 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