Virus:Worm/PackBot.W
Date discovered:22/03/2006
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:247.808 Bytes
MD5 checksum:a26f08b206a8b89acb2f2b6c0Fa21c49
VDF version:6.34.00.88

 General Method of propagation:
   • Local network


Aliases:
   •  Symantec: W32.Spybot.Worm
   •  Mcafee: W32/Gaobot.worm.gen.k
   •  Kaspersky: Backdoor.Win32.PackBot.w
   •  TrendMicro: WORM_SPYBOT.AVU
   •  Bitdefender: Backdoor.Agent.FH

It was previously detected as:
   •  BDS/PackBot.W


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Disable security applications
   • Lowers security settings
   • Registry modification
   • Makes use of software vulnerability
   • Third party control

 Files It copies itself to the following location:
   • %SYSDIR%\servza.exe



It deletes the initially executed copy of itself.

 Registry The following registry keys are continuously in an infinite loop added in order to run the processes after reboot.

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "System Service"="servza.exe"

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
   • "System Service"="servza.exe"



The following registry key is added:

– [HKCU\Software\Microsoft\OLE]
   • "System Service"="servza.exe"



The following registry keys are changed:

– [HKLM\SYSTEM\CurrentControlSet\Control\Lsa]
   Old value:
   • "restrictanonymous"=dword:%user defined settings%
   New value:
   • "restrictanonymous"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\Ole]
   Old value:
   • "EnableDCOM"="%user defined settings%"
   New value:
   • "EnableDCOM"="N"

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.

It drops copies of itself to the following network shares:
   • IPC$
   • ADMIN$
   • C$
   • D$
   • C:\
   • D:\


It uses the following login information in order to gain access to the remote machine:

– The following list of usernames:
   • adm; admin; administrador; administrat; administrateur; administrator;
      admins; computer; database; db2; dba; default; guest; oracle; owner;
      root; teacher; staff; student; wwwadmin

– The following list of passwords:
   • 007; 123; 1234; 2000; 2001; 2002; 2003; 2004; 12345; 123456; 1234567;
      12345678; 123456789; 1234567890; access; accounting; accounts; asd;
      backup; bill; bitch; blank; bob; brian; changeme; chris; cisco;
      compaq; control; data; databasepass; databasepassword; db1; db1234;
      dbpass; dbpassword; dell; demo; domain; domainpass; domainpassword;
      eric; exchange; fred; fuck; george; god; hell; hello; home; homeuser;
      ian; ibm; internet; intranet; jen; joe; john; kate; katie; lan; lee;
      linux; login; loginpass; luke; mail; main; mary; mike; neil; nokia;
      none; null; oem; oeminstall; oemuser; office; orainstall; outlook;
      pass; pass1234; passwd; password; password1; peter; pwd; qaz; qwe;
      qwerty; sam; server; sex; siemens; slut; sql; sqlpassoainstall; sue;
      susan; system; technical; test; unix; user; web; win2000; win2k;
      win98; windows; winnt; winpass; winxp; www; zxc



Exploit:
It makes use of the following Exploits:
– MS04-007 (ASN.1 Vulnerability)
– MS04-011 (LSASS Vulnerability)
– VX05-006 (Remote Heap Overflow when using the VERITAS Backup Exec Admin Plus Pack Option)


IP address generation:
It creates random IP addresses while it keeps the first two octets from its own address. Afterwards it tries to establish a connection with the created addresses.


Infection process:
Creates a TFTP or FTP script on the compromised machine in order to download the malware to the remote location.


Remote execution:
–It attempts to schedule a remote execution of the malware, on the newly infected machine. Therefore it uses the NetScheduleJobAdd function.

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: teamall.engimaes.**********
Port: 7000
Channel: #server#
Nickname: Bot|%four-digit random character string%
Password: send.



– This malware has the ability to collect and send information such as:
    • CPU speed
    • Current user
    • Free disk space
    • Free memory
    • Malware uptime
    • Information about the network
    • Information about running processes
    • Size of memory
    • System directory
    • Information about the Windows operating system


– Furthermore it has the ability to perform actions such as:
    • connect to IRC server
    • Launch DDoS ICMP flood
    • Launch DDoS SYN flood
    • Launch DDoS UDP flood
    • Disable network shares
    • disconnect from IRC server
    • Download file
    • Enable DCOM
    • Enable network shares
    • Execute file
    • Join IRC channel
    • Kill process
    • Leave IRC channel
    • Open remote shell
    • Perform DDoS attack
    • Perform network scan
    • Perform port redirection
    • Restart system
    • Send emails
    • Start spreading routine
    • Terminate malware
    • Terminate process
    • Updates itself
    • Upload file
    • Visit a website

 Process termination List of processes that are terminated:
   • _AVP32.EXE; _AVPCC.EXE; _AVPM.EXE; ACKWIN32.EXE; ADAWARE.EXE;
      ADVXDWIN.EXE; AGENTSVR.EXE; AGENTW.EXE; ALERTSVC.EXE; ALEVIR.EXE;
      ALOGSERV.EXE; AMON9X.EXE; ANTI-TROJAN.EXE; ANTIVIRUS.EXE; ANTS.EXE;
      APIMONITOR.EXE; APLICA32.EXE; APVXDWIN.EXE; ARR.EXE; ATCON.EXE;
      ATGUARD.EXE; ATRO55EN.EXE; ATUPDATER.EXE; ATUPDATER.EXE; ATWATCH.EXE;
      AU.EXE; AUPDATE.EXE; AUPDATE.EXE; AUTODOWN.EXE; AUTODOWN.EXE;
      AUTO-PROTECT.NAV80TRY.EXE; AUTOTRACE.EXE; AUTOTRACE.EXE;
      AUTOUPDATE.EXE; AUTOUPDATE.EXE; AVCONSOL.EXE; AVE32.EXE; AVGCC32.EXE;
      AVGCTRL.EXE; AVGNT.EXE; AVGSERV.EXE; AVGSERV9.EXE; AVGUARD.EXE;
      AVGW.EXE; AVKPOP.EXE; AVKSERV.EXE; AVKSERVICE.EXE; AVKWCTl9.EXE;
      AVLTMAIN.EXE; AVNT.EXE; AVP.EXE; AVP32.EXE; AVPCC.EXE; AVPDOS32.EXE;
      AVPM.EXE; AVPTC32.EXE; AVPUPD.EXE; AVPUPD.EXE; AVSCHED32.EXE;
      AVSYNMGR.EXE; AVWIN95.EXE; AVWINNT.EXE; AVWUPD.EXE; AVWUPD32.EXE;
      AVWUPD32.EXE; AVWUPSRV.EXE; AVXMONITOR9X.EXE; AVXMONITORNT.EXE;
      AVXQUAR.EXE; AVXQUAR.EXE; BACKWEB.EXE; BARGAINS.EXE;
      BD_PROFESSIONAL.EXE; BEAGLE.EXE; BELT.EXE; BIDEF.EXE; BIDSERVER.EXE;
      BIPCP.EXE; BIPCPEVALSETUP.EXE; BISP.EXE; BLACKD.EXE; BLACKICE.EXE;
      BLSS.EXE; BOOTCONF.EXE; BOOTWARN.EXE; BORG2.EXE; BPC.EXE; BRASIL.EXE;
      BS120.EXE; BUNDLE.EXE; BVT.EXE; CCAPP.EXE; CCEVTMGR.EXE; CCPXYSVC.EXE;
      CDP.EXE; CFD.EXE; CFGWIZ.EXE; CFIADMIN.EXE; CFIAUDIT.EXE;
      CFIAUDIT.EXE; CFINET.EXE; CFINET32.EXE; Claw95.EXE; CLAW95CF.EXE;
      CLAW95CF.EXE; CLEAN.EXE; CLEANER.EXE; CLEANER3.EXE; CLEANPC.EXE;
      CLICK.EXE; CMD32.EXE; CMESYS.EXE; CMGRDIAN.EXE; CMON016.EXE;
      CONNECTIONMONITOR.EXE; CPD.EXE; CPF9X206.EXE; CPFNT206.EXE; CTRL.EXE;
      CV.EXE; CWNB181.EXE; CWNTDWMO.EXE; DATEMANAGER.EXE; DCOMX.EXE;
      DEFALERT.EXE; DEFSCANGUI.EXE; DEFWATCH.EXE; DEPUTY.EXE; DIVX.EXE;
      DLLCACHE.EXE; DLLREG.EXE; DOORS.EXE; DPF.EXE; DPFSETUP.EXE; DPPS2.EXE;
      DRWATSON.EXE; DRWEB32.EXE; DRWEBUPW.EXE; DSSAGENT.EXE; DVP95.EXE;
      DVP95_0.EXE; ECENGINE.EXE; EFPEADM.EXE; EMSW.EXE; ENT.EXE; ESAFE.EXE;
      ESCANH95.EXE; ESCANHNT.EXE; ESCANV95.EXE; ESPWATCH.EXE; ETHEREAL.EXE;
      ETRUSTCIPE.EXE; EVPN.EXE; EXANTIVIRUS-CNET.EXE; EXE.AVXW.EXE;
      EXPERT.EXE; EXPLORE.EXE; F-AGNT95.EXE; F-AGOBOT.EXE; FAMEH32.EXE;
      FAST.EXE; FCH32.EXE; FIH32.EXE; FINDVIRU.EXE; FIREWALL.EXE;
      FLOWPROTECTOR.EXE; FNRB32.EXE; FPROT.EXE; F-PROT.EXE; F-PROT95.EXE;
      FP-WIN.EXE; FP-WIN_TRIAL.EXE; FRW.EXE; FSAA.EXE; FSAV.EXE; FSAV32.EXE;
      FSAV530STBYB.EXE; FSAV530WTBYB.EXE; FSAV95.EXE; FSGK32.EXE; FSM32.EXE;
      FSMA32.EXE; FSMB32.EXE; F-STOPW.EXE; GATOR.EXE; GBMENU.EXE;
      GBPOLL.EXE; GENERICS.EXE; GMT.EXE; GUARD.EXE; GUARDDOG.EXE;
      HACKTRACERSETUP.EXE; HBINST.EXE; HBSRV.EXE; HIJACKTHIS.EXE;
      HOTACTIO.EXE; HOTPATCH.EXE; HTLOG.EXE; HTPATCH.EXE; HWPE.EXE;
      HXDL.EXE; HXIUL.EXE; IAMAPP.EXE; IAMSERV.EXE; IAMSTATS.EXE;
      IBMASN.EXE; IBMAVSP.EXE; ICLOAD95.EXE; ICLOADNT.EXE; ICMON.EXE;
      ICSUPP95.EXE; ICSUPP95.EXE; ICSUPPNT.EXE; IDLE.EXE; IEDLL.EXE;
      IEDRIVER.EXE; IEXPLORER.EXE; IFACE.EXE; IFW2000.EXE; INETLNFO.EXE;
      INFUS.EXE; INFWIN.EXE; INIT.EXE; INTDEL.EXE; INTREN.EXE; IOMON98.EXE;
      IPARMOR.EXE; IRIS.EXE; ISASS.EXE; ISRV95.EXE; ISTSVC.EXE; JAMMER.EXE;
      JDBGMRG.EXE; JEDI.EXE; KAVLITE40ENG.EXE; KAVPERS40ENG.EXE; KAVPF.EXE;
      KAZZA.EXE; KEENVALUE.EXE; KERIO-PF-213-EN-WIN.EXE;
      KERIO-WRL-421-EN-WIN.EXE; KERIO-WRP-421-EN-WIN.EXE; KERNEL32.EXE;
      KILLPROCESSSETUP161.EXE; LAUNCHER.EXE; LDNETMON.EXE; LDPRO.EXE;
      LDPROMENU.EXE; LDSCAN.EXE; LNETINFO.EXE; LOADER.EXE; LOCALNET.EXE;
      LOCKDOWN.EXE; LOCKDOWN2000.EXE; LOOKOUT.EXE; LORDPE.EXE; LSETUP.EXE;
      LUALL.EXE; LUALL.EXE; LUAU.EXE; LUCOMSERVER.EXE; LUINIT.EXE;
      LUSPT.EXE; MAPISVC32.EXE; MCAGENT.EXE; MCMNHDLR.EXE; MCSHIELD.EXE;
      MCTOOL.EXE; MCUPDATE.EXE; MCUPDATE.EXE; MCVSRTE.EXE; MCVSSHLD.EXE;
      MD.EXE; MFIN32.EXE; MFW2EN.EXE; MFWENG3.02D30.EXE; MGAVRTCL.EXE;
      MGAVRTE.EXE; MGHTML.EXE; MGUI.EXE; MINILOG.EXE; MMOD.EXE; MONITOR.EXE;
      MOOLIVE.EXE; MOSTAT.EXE; MPFAGENT.EXE; MPFSERVICE.EXE; MPFTRAY.EXE;
      MRFLUX.EXE; MSAPP.EXE; MSBB.EXE; MSBLAST.EXE; MSCACHE.EXE;
      MSCCN32.EXE; MSCMAN.EXE; MSCONFIG.EXE; MSDM.EXE; MSDOS.EXE;
      MSIEXEC16.EXE; MSINFO32.EXE; MSLAUGH.EXE; MSMGT.EXE; MSMSGRI32.EXE;
      MSSMMC32.EXE; MSSYS.EXE; MSVXD.EXE; MU0311AD.EXE; MWATCH.EXE;
      N32SCANW.EXE; NAV.EXE; NAVAP.NAVAPSVC.EXE; NAVAPSVC.EXE; NAVAPW32.EXE;
      NAVDX.EXE; NAVENGNAVEX15.NAVLU32.EXE; NAVLU32.EXE; NAVNT.EXE;
      NAVSTUB.EXE; NAVW32.EXE; NAVWNT.EXE; NC2000.EXE; NCINST4.EXE;
      NDD32.EXE; NEOMONITOR.EXE; NEOWATCHLOG.EXE; NETARMOR.EXE; NETD32.EXE;
      NETINFO.EXE; NETMON.EXE; NETSCANPRO.EXE; NETSPYHUNTER-1.2.EXE;
      NETSTAT.EXE; NETUTILS.EXE; NISSERV.EXE; NISUM.EXE; NMAIN.EXE;
      NOD32.EXE; NORMIST.EXE; NORTON_INTERNET_SECU_3.0_407.EXE;
      NOTSTART.EXE; NPF40_TW_98_NT_ME_2K.EXE; NPFMESSENGER.EXE;
      NPROTECT.EXE; NPSCHECK.EXE; NPSSVC.EXE; NSCHED32.EXE; NSSYS32.EXE;
      NSTASK32.EXE; NSUPDATE.EXE; NT.EXE; NTRTSCAN.EXE; NTVDM.EXE;
      NTXconfig.EXE; NUI.EXE; NUPGRADE.EXE; NUPGRADE.EXE; NVARCH16.EXE;
      NVC95.EXE; NVSVC32.EXE; NWINST4.EXE; NWSERVICE.EXE; NWTOOL16.EXE;
      OLLYDBG.EXE; ONSRVR.EXE; OPTIMIZE.EXE; OSTRONET.EXE; OTFIX.EXE;
      OUTPOST.EXE; OUTPOST.EXE; OUTPOSTINSTALL.EXE; OUTPOSTPROINSTALL.EXE;
      PADMIN.EXE; PANIXK.EXE; PATCH.EXE; PAVCL.EXE; PAVPROXY.EXE;
      PAVSCHED.EXE; PAVW.EXE; PCC2002S902.EXE; PCC2K_76_1436.EXE;
      PCCIOMON.EXE; PCCNTMON.EXE; PCCWIN97.EXE; PCCWIN98.EXE; PCDSETUP.EXE;
      PCFWALLICON.EXE; PCIP10117_0.EXE; PCSCAN.EXE; PDSETUP.EXE; PENIS.EXE;
      PERISCOPE.EXE; PERSFW.EXE; PERSWF.EXE; PF2.EXE; PFWADMIN.EXE;
      PGMONITR.EXE; PINGSCAN.EXE; PLATIN.EXE; POP3TRAP.EXE; POPROXY.EXE;
      POPSCAN.EXE; PORTDETECTIVE.EXE; PORTMONITOR.EXE; POWERSCAN.EXE;
      PPINUPDT.EXE; PPTBC.EXE; PPVSTOP.EXE; PRIZESURFER.EXE; PRMT.EXE;
      PRMVR.EXE; PROCDUMP.EXE; PROCESSMONITOR.EXE; PROCEXPLORERV1.0.EXE;
      PROGRAMAUDITOR.EXE; PROPORT.EXE; PROTECTX.EXE; PSPF.EXE; PURGE.EXE;
      PUSSY.EXE; PVIEW95.EXE; QCONSOLE.EXE; QSERVER.EXE; RAPAPP.EXE;
      RAV7.EXE; RAV7WIN.EXE; RAV8WIN32ENG.EXE; RAY.EXE; RB32.EXE;
      RCSYNC.EXE; REALMON.EXE; REGED.EXE; REGEDIT.EXE; REGEDT32.EXE;
      RESCUE.EXE; RESCUE32.EXE; RRGUARD.EXE; RSHELL.EXE; RTVSCAN.EXE;
      RTVSCN95.EXE; RULAUNCH.EXE; RUN32DLL.EXE; RUNDLL.EXE; RUNDLL16.EXE;
      RUXDLL32.EXE; SAFEWEB.EXE; SAHAGENT.EXE; SAVE.EXE; SAVENOW.EXE;
      SBSERV.EXE; SC.EXE; SCAM32.EXE; SCAN32.EXE; SCAN95.EXE; SCANPM.EXE;
      SCRSCAN.EXE; SCRSVR.EXE; SCVHOST.EXE; SD.EXE; SERV95.EXE; SERVICE.EXE;
      SERVLCE.EXE; SERVLCES.EXE; SETUP_FLOWPROTECTOR_US.EXE;
      SETUPVAMEEVAL.EXE; SFC.EXE; SGSSFW32.EXE; SH.EXE; SHELLSPYINSTALL.EXE;
      SHN.EXE; SHOWBEHIND.EXE; SMC.EXE; SMS.EXE; SMSS32.EXE; SOAP.EXE;
      SOFI.EXE; SPERM.EXE; SPF.EXE; SPHINX.EXE; SPOLER.EXE; SPOOLCV.EXE;
      SPOOLSV32.EXE; SPYXX.EXE; SREXE.EXE; SRNG.EXE; SS3EDIT.EXE;
      SSG_4104.EXE; SSGRATE.EXE; ST2.EXE; START.EXE; STCLOADER.EXE;
      SUPFTRL.EXE; SUPPORT.EXE; SUPPORTER5.EXE; SVC.EXE; SVCHOSTC.EXE;
      SVCHOSTS.EXE; SVSHOST.EXE; SWEEP95.EXE;
      SWEEPNET.SWEEPSRV.SYS.SWNETSUP.EXE; SYMPROXYSVC.EXE; SYMTRAY.EXE;
      SYSEDIT.EXE; SYSTEM.EXE; SYSTEM32.EXE; SYSUPD.EXE; TASKMG.EXE;
      TASKMGR.EXE; TASKMO.EXE; TASKMON.EXE; TAUMON.EXE; TBSCAN.EXE; TC.EXE;
      TCA.EXE; TCM.EXE; TDS2-98.EXE; TDS2-NT.EXE; TDS-3.EXE; TEEKIDS.EXE;
      TFAK.EXE; TFAK5.EXE; TGBOB.EXE; TITANIN.EXE; TITANINXP.EXE;
      TRACERT.EXE; TRICKLER.EXE; TRJSCAN.EXE; TRJSETUP.EXE; TROJANTRAP3.EXE;
      TSADBOT.EXE; TVMD.EXE; TVTMD.EXE; UNDOBOOT.EXE; UPDAT.EXE; UPDATE.EXE;
      UPDATE.EXE; UPGRAD.EXE; UTPOST.EXE; VBCMSERV.EXE; VBCONS.EXE;
      VBUST.EXE; VBWIN9X.EXE; VBWINNTW.EXE; VCSETUP.EXE; VET32.EXE;
      VET95.EXE; VETTRAY.EXE; VFSETUP.EXE; VIR-HELP.EXE;
      VIRUSMDPERSONALFIREWALL.EXE; VNLAN300.EXE; VNPC3000.EXE; VPC32.EXE;
      VPC42.EXE; VPFW30S.EXE; VPTRAY.EXE; VSCAN40.EXE; VSCENU6.02D30.EXE;
      VSCHED.EXE; VSECOMR.EXE; VSHWIN32.EXE; VSISETUP.EXE; VSMAIN.EXE;
      VSMON.EXE; VSSTAT.EXE; VSWIN9XE.EXE; VSWINNTSE.EXE; VSWINPERSE.EXE;
      W32DSM89.EXE; W9X.EXE; WATCHDOG.EXE; WEBDAV.EXE; WEBSCANX.EXE;
      WEBTRAP.EXE; WFINDV32.EXE; WGFE95.EXE; WHOSWATCHINGME.EXE;
      WIMMUN32.EXE; WIN32.EXE; WIN32US.EXE; WINACTIVE.EXE; WIN-BUGSFIX.EXE;
      WINDOW.EXE; WINDOWS.EXE; WININETD.EXE; WININIT.EXE; WININITX.EXE;
      WINLOGIN.EXE; WINMAIN.EXE; WINNET.EXE; WINPPR32.EXE; WINRECON.EXE;
      WINSERVN.EXE; WINSSK32.EXE; WINSTART.EXE; WINSTART001.EXE;
      WINTSK32.EXE; WINUPDATE.EXE; WKUFIND.EXE; WNAD.EXE; WNT.EXE;
      WRADMIN.EXE; WRCTRL.EXE; WSBGATE.EXE; WUPDATER.EXE; WUPDT.EXE;
      WYVERNWORKSFIREWALL.EXE; XPF202EN.EXE; ZAPRO.EXE; ZAPSETUP3001.EXE;
      ZATUTOR.EXE; ZONALM2601.EXE; ZONEALARM.EXE


 Miscellaneous Mutex:
It creates the following Mutex:
   • [Ruff]

 File details Programming language:
 The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Iulia Diaconescu on Wednesday, March 22, 2006
Description updated by Iulia Diaconescu on Thursday, March 23, 2006

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