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  3. W32.Sality.AE

W32.Sality.AE

Risk Level 1: Very Low

Discovered:
April 20, 2008
Updated:
August 10, 2008 11:06:05 AM
Also Known As:
TROJ_AGENT.XOO [Trend], W32/Sality.ae [McAfee], Sality.AG [Panda Software], Win32/Sality.Z [Computer Associates], Win32/Sality.AA [Computer Associates], W32/Sality.AA [F-Secure]
Type:
Virus
Infection Length:
57,344 bytes
Systems Affected:
Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
When the virus is executed, it copies itself as the following file:
%System%\drivers\[RANDOM NAME].sys

The virus creates the following mutex so only one instance of the virus is running:
Op1mutx9

It then creates the following registry subkeys:
  • HKEY_CURRENT_USER\Software\[USER NAME]914
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_WMI_MFC_TPSHOKER_80
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_IPFILTERDRIVER

It then creates the following registry entry so that it bypasses the Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\"[INFECTED FILE]" = "[INFECTED FILE]:*:Enabled:ipsec"

It modifies the following registry entries:
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Setting\"GlobalUserOffline" = "0"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system\"EnableLUA" = "0"

The virus also deletes entries under the following registry subkeys:
  • HKEY_CURRENT_USER\System\CurrentControlSet\Control\SafeBoot
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Stats
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Stats
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\Stats
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects

It then registers itself as a new service with the following characteristics:
Service Name: WMI_MFC_TPSHOKER_80
Display Name: WMI_MFC_TPSHOKER_80
Startup Type: Automatic

It then deletes the following file:
%System%\drivers\[RANDOM NAME].sys

It stops the following services:
  • ALG
  • aswUpdSv
  • avast! Antivirus
  • avast! Mail Scanner
  • avast! Web Scanner
  • AVP
  • BackWeb Plug-in - 4476822
  • bdss
  • BGLiveSvc
  • BlackICE
  • CAISafe
  • ccEvtMgr
  • ccProxy
  • ccSetMgr
  • F-Prot Antivirus Update Monitor
  • fsbwsys
  • FSDFWD
  • F-Secure Gatekeeper Handler Starter
  • fshttps
  • FSMA
  • InoRPC
  • InoRT
  • InoTask
  • ISSVC
  • KPF4
  • LavasoftFirewall
  • LIVESRV
  • McAfeeFramework
  • McShield
  • McTaskManager
  • navapsvc
  • NOD32krn
  • NPFMntor
  • NSCService
  • Outpost Firewall main module
  • OutpostFirewall
  • PAVFIRES
  • PAVFNSVR
  • PavProt
  • PavPrSrv
  • PAVSRV
  • PcCtlCom
  • PersonalFirewal
  • PREVSRV
  • ProtoPort Firewall service
  • PSIMSVC
  • RapApp
  • SmcService
  • SNDSrvc
  • SPBBCSvc
  • Symantec Core LC
  • Tmntsrv
  • TmPfw
  • tmproxy
  • UmxAgent
  • UmxCfg
  • UmxLU
  • UmxPol
  • vsmon
  • VSSERV
  • WebrootDesktopFirewallDataService
  • WebrootFirewall
  • XCOMM

It infects all executable files listed under the following registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache

It infects all .exe executable files listed under the following registry subkeys:
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

It also infects all .exe and .scr files on the C drive and on any writable network resource, except the files on any folder with the following strings:
  • SYSTEM
  • AHEAD

The infected file size will increase 57,344 bytes.

It deletes any file whose name contains any of the following strings:
  • .VDB
  • .AVC
  • .KEY
  • drw
  • _AVPM
  • A2GUARD
  • AAVSHIELD
  • AVAST
  • ADVCHK
  • AHNSD
  • AIRDEFENSE
  • ALERTSVC
  • ALMON
  • ALOGSERV
  • ALSVC
  • AMON
  • ANTI-TROJAN
  • AVZ
  • ANTIVIR
  • ANTS
  • APVXDWIN
  • ARMOR2NET
  • ASHAVAST
  • ASHDISP
  • ASHENHCD
  • ASHMAISV
  • ASHPOPWZ
  • ASHSERV
  • ASHSIMPL
  • ASHSKPCK
  • ASHWEBSV
  • ASWUPDSV
  • ATCON
  • ATUPDATER
  • ATWATCH
  • AUPDATE
  • AUTODOWN
  • AUTOTRACE
  • AUTOUPDATE
  • AVCIMAN
  • AVCONSOL
  • AVENGINE
  • AVGAMSVR
  • AVGCC
  • AVGCC32
  • AVGCTRL
  • AVGEMC
  • AVGFWSRV
  • AVGNT
  • AVGNTDD
  • AVGNTMGR
  • AVGSERV
  • AVGUARD
  • AVGUPSVC
  • AVINITNT
  • AVKSERV
  • AVKSERVICE
  • AVKWCTL
  • AVP
  • AVP32
  • AVPCC
  • AVPM
  • AVPUPD
  • AVSCHED32
  • AVSYNMGR
  • AVWUPD32
  • AVWUPSRV
  • AVXMONITOR9X
  • AVXMONITORNT
  • AVXQUAR
  • BACKWEB-4476822
  • BDMCON
  • BDNEWS
  • BDOESRV
  • BDSS
  • BDSUBMIT
  • BDSWITCH
  • BLACKD
  • BLACKICE
  • CAFIX
  • CCAPP
  • CCEVTMGR
  • CCPROXY
  • CCSETMGR
  • CFIAUDIT
  • CLAMTRAY
  • CLAMWIN
  • CLAW95
  • CLAW95CF
  • CLEANER
  • CLEANER3
  • CLISVC
  • CMGRDIAN
  • CUREIT
  • DEFWATCH
  • DOORS
  • DRVIRUS
  • DRWADINS
  • DRWEB32W
  • DRWEBSCD
  • DRWEBUPW
  • ESCANH95
  • ESCANHNT
  • EWIDOCTRL
  • EZANTIVIRUSREGISTRATIONCHECK
  • F-AGNT95
  • FAMEH32
  • FAST
  • FCH32
  • FILEMON
  • FIRESVC
  • FIRETRAY
  • FIREWALL
  • FPAVUPDM
  • F-PROT95
  • FRESHCLAM
  • FRW
  • FSAV32
  • FSAVGUI
  • FSBWSYS
  • F-SCHED
  • FSDFWD
  • FSGK32
  • FSGK32ST
  • FSGUIEXE
  • FSM32
  • FSMA32
  • FSMB32
  • FSPEX.
  • FSSM32
  • F-STOPW
  • GCASDTSERV
  • GCASSERV
  • GIANTANTISPYWAREMAIN
  • GIANTANTISPYWAREUPDATER
  • GUARDGUI
  • GUARDNT
  • HREGMON
  • HRRES
  • HSOCKPE
  • HUPDATE
  • IAMAPP
  • IAMSERV
  • ICLOAD95
  • ICLOADNT
  • ICMON
  • ICSSUPPNT
  • ICSUPP95
  • ICSUPPNT
  • IFACE
  • INETUPD
  • INOCIT
  • INORPC
  • INORT
  • INOTASK
  • INOUPTNG
  • IOMON98
  • ISAFE
  • ISATRAY
  • ISRV95
  • ISSVC
  • KAV
  • KAVMM
  • KAVPF
  • KAVPFW
  • KAVSTART
  • KAVSVC
  • KAVSVCUI
  • KMAILMON
  • KPFWSVC
  • KWATCH
  • LOCKDOWN2000
  • LOGWATNT
  • LUALL
  • LUCOMSERVER
  • LUUPDATE
  • MCAGENT
  • MCMNHDLR
  • MCREGWIZ
  • MCUPDATE
  • MCVSSHLD
  • MINILOG
  • MYAGTSVC
  • MYAGTTRY
  • NAVAPSVC
  • NAVAPW32
  • NAVLU32
  • NAVW32
  • NOD32
  • NEOWATCHLOG
  • NEOWATCHTRAY
  • NISSERV
  • NISUM
  • NMAIN
  • NOD32
  • NORMIST
  • NOTSTART
  • NPAVTRAY
  • NPFMNTOR
  • NPFMSG
  • NPROTECT
  • NSCHED32
  • NSMDTR
  • NSSSERV
  • NSSTRAY
  • NTRTSCAN
  • NTXCONFIG
  • NUPGRADE
  • NVC95
  • NVCOD
  • NVCTE
  • NVCUT
  • NWSERVICE
  • OFCPFWSVC
  • OUTPOST
  • PAV
  • PAVFIRES
  • PAVFNSVR
  • PAVKRE
  • PAVPROT
  • PAVPROXY
  • PAVPRSRV
  • PAVSRV51
  • PAVSS
  • PCCGUIDE
  • PCCIOMON
  • PCCNTMON
  • PCCPFW
  • PCCTLCOM
  • PCTAV
  • PERSFW
  • PERTSK
  • PERVAC
  • PNMSRV
  • POP3TRAP
  • POPROXY
  • PREVSRV
  • PSIMSVC
  • QHM32
  • QHONLINE
  • QHONSVC
  • QHPF
  • QHWSCSVC
  • RAVMON
  • RAVTIMER
  • REALMON
  • REALMON95
  • RFWMAIN
  • RTVSCAN
  • RTVSCN95
  • RULAUNCH
  • SAVADMINSERVICE
  • SAVMAIN
  • SAVPROGRESS
  • SAVSCAN
  • SCAN32
  • SCANNINGPROCESS
  • CUREIT
  • SDHELP
  • SHSTAT
  • SITECLI
  • SPBBCSVC
  • SPHINX
  • SPIDERML
  • SPIDERNT
  • SPIDERUI
  • SPYBOTSD
  • SPYXX
  • SS3EDIT
  • STOPSIGNAV
  • SWAGENT
  • SWDOCTOR
  • SWNETSUP
  • SYMLCSVC
  • SYMPROXYSVC
  • SYMSPORT
  • SYMWSC
  • SYNMGR
  • TAUMON
  • TBMON
  • TC
  • TCA
  • TCM
  • TDS-3
  • TEATIMER
  • TFAK
  • THAV
  • THSM
  • TMAS
  • TMLISTEN
  • TMNTSRV
  • TMPFW
  • TMPROXY
  • TNBUTIL
  • TRJSCAN
  • UP2DATE
  • VBA32ECM
  • VBA32IFS
  • VBA32LDR
  • VBA32PP3
  • VBSNTW
  • VCHK
  • VCRMON
  • VETTRAY
  • VIRUSKEEPER
  • VPTRAY
  • VRFWSVC
  • VRMONNT
  • VRMONSVC
  • VRRW32
  • VSECOMR
  • VSHWIN32
  • VSMON
  • VSSERV
  • VSSTAT
  • WATCHDOG
  • WEBPROXY
  • WEBSCANX
  • WEBTRAP
  • WGFE95
  • WINAW32
  • WINROUTE
  • WINSS
  • WINSSNOTIFY
  • WRADMIN
  • WRCTRL
  • XCOMMSVR
  • ZATUTOR
  • ZAUINST
  • ZLCLIENT
  • ZONEALARM

It connects to the following URLs to get instructions. The instructions contain additional URLs to possibly download other malicious files:
  • [http://]pedmeo222nb.info
  • [http://]pzrk.ru
  • [http://]technican.w.interia.pl
  • [http://]www.kjwre9fqwieluoi.info
  • [http://]bpowqbvcfds677.info
  • [http://]bmakemegood24.com
  • [http://]bperfectchoice1.com
  • [http://]bcash-ddt.net
  • [http://]bddr-cash.net
  • [http://]btrn-cash.net
  • [http://]bmoney-frn.net
  • [http://]bclr-cash.net
  • [http://]bxxxl-cash.net
  • [http://]balsfhkewo7i487fksd.info
  • [http://]buynvf96.info
  • [http://]89.119.67.154/tes[REMOVED]
  • [http://]oceaninfo.co.kr/picas[REMOVED]
  • [http://]kukutrustnet777.info/home[REMOVED]
  • [http://]kukutrustnet888.info/home[REMOVED]
  • [http://]kukutrustnet987.info/home[REMOVED]
  • [http://]kukutrustnet777.info
  • [http://]www.kjwre9fqwieluoi.info
  • [http://]kjwre77638dfqwieuoi.info


It prevents access to various security-related domains containing any of the following strings:
  • Cureit
  • Drweb
  • Onlinescan
  • Spywareinfo
  • Ewido
  • Virusscan
  • Windowsecurity
  • Spywareguide
  • Bitdefender
  • Panda software
  • Agnmitum
  • Virustotal
  • Sophos
  • Trend Micro
  • Etrust.com
  • Symantec
  • McAfee
  • F-Secure
  • Eset.com
  • Kaspersky

It adds the following entry to %Windir%\system.ini:
[MCIDRV_VER]

It then copies itself to attached removable drives using the following filenames:
%DriveLetter%:\[RANDOM NAME].exe
%DriveLetter%:\[RANDOM NAME].cmd
%DriveLetter%:\[RANDOM NAME].pif

The following file is created on attached removable drives so that the threat runs whenever the drive is connected to a computer:
%DriveLetter%:\autorun.inf

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Kaoru Hayashi
Summary| Technical Details| Removal

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