WORM_AGOBOT.AEW

Malware type: Worm

Aliases: W32/Gaobot.worm.gen.e (McAfee), Backdoor.Sdbot (Symantec), BDS/Aebot.N.2 (Avira), Mal/Behav-132 (Sophos),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

Upon execution, this memory-resident worm drops a copy of itself as the file DLLSRV32.EXE in the Windows system folder.

This worm spreads via network shares and Internet Relay Chat (IRC).

It terminates several processes, most of which are related to antivirus software and tools.

It also deletes several antivirus and firewall-related registry entry values.

This worm has backdoor capabilities. It acts as a server program controlled by an IRC bot.

Once connected, this IRC bot is capable of sending commands to the server program. These commands are used to control the target system and the behavior of the bot.

The worm runs on Windows 95, 98, ME, NT, 2000, and XP.

For additional information about this threat, see:

Description created: Jan. 14, 2005 8:49:42 AM GMT -0800
Description updated: Jan. 14, 2005 9:30:33 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 94,891 Bytes

Initial samples received on: Jan 14, 2005

Payload 1: Closes particular windows

Trigger condition 1: Upon execution

Payload 2: Terminates processes

Trigger condition 1: Upon execution

Payload 3: Compromises system security

Trigger condition 1: Upon execution

Details:

Installation

Upon execution, this memory-resident worm drops a copy of itself as the file DLLSRV32.EXE in the Windows system folder.

It creates the following registry entries to ensure its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Run
RegScan = "DLLSRV32.EXE -services"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\RunServices
RegScan = "DLLSRV32.EXE -services"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Run
RegScan = "DLLSRV32.EXE -drivers"

It then deletes the original file and transfers the control to the dropped file.

Network Propagation

This worm spreads via network shares and Internet Relay Chat (IRC).

Antivirus Retaliation

It automatically closes windows with the following window titles:

  • Alerter
  • AvgServ
  • AVPCC
  • AvSynMgr
  • AvxIni
  • BlackICE
  • BullGuard
  • ccEvtMgr
  • ches de Windows
  • DefWatch
  • Ethereal
  • firewall
  • F-Secure Gatekeeper Handler Starter
  • Gestionnaire des t
  • HijackThis
  • KAVMonitorService
  • McShield
  • Messenger
  • monitor
  • ms_webcheckmonitor
  • NAV Auto-Protect
  • navapsvc
  • NISSERV
  • NISUM
  • Norman NJeeves
  • Norton Antivirus Server
  • NProtectService
  • nvcoas
  • NVCScheduler
  • NWService
  • OutpostFirewall
  • Panda ActiveScan
  • PAVFIRES
  • PAVSRV
  • PCCPFW
  • Processes
  • ravmon8
  • Registry Editor
  • rpcapd
  • SBService
  • Security Center
  • Security Task Manager
  • sniff
  • spidernt
  • SweepNet
  • SWEEPSRV.SYS
  • SymProxySvc
  • sysinternals
  • SysListView32
  • System Configuration Utility
  • Tmntsrv
  • unpack
  • virus
  • Windows Task Manager
  • wscscv
  • wuauserv
  • XCOMM

It terminates the following processes, most of which are related to antivirus software and tools:

  • actalert.exe
  • AdDestroyer.exe
  • Alles-ist-vorbei.exe
  • apvxdwin.exe
  • Avengine.exe
  • avgcc32.exe
  • avgserv.exe
  • avpcc.exe
  • bargains.exe
  • bigfix.exe
  • Blaargh.exe
  • blackd.exe
  • blackice.exe
  • cashback.exe
  • ccApp.exe
  • ccEvtMgr.exe
  • CClaw.exe
  • CCPXYSVC.EXE
  • CCSETMGR.EXE
  • Cheese-Burger.exe
  • CMESys.exe
  • DateManager.exe
  • Desktop-shooting.exe
  • dllhost32.exe
  • dmserver.exe
  • drweb32w.exe
  • drwebscd.exe
  • dust.exe
  • EtherD.exe
  • ethereal.exe
  • evntsvc.exe
  • filemon.exe
  • firedaemon.exe
  • FRW.EXE
  • GAMECHANNEL.EXE
  • GMT.exe
  • guw32.exe
  • hbsrv.exe
  • HijackThis.exe
  • IAMAPP.EXE
  • IAMSERV.EXE
  • imss.exe
  • intrenat.exe
  • istsvc.exe
  • KeenValue.exe
  • lockdown.exe
  • LOCKDOWN2000.EXE
  • lockdown2000.exe
  • Lookout.exe
  • lordpe.exe
  • MCAGENT.EXE
  • McShield.exe
  • mcupdate.exe
  • mcvsrte.exe
  • mcvsshld.exe
  • mghtml.exe
  • mgui.exe
  • minilog.exe
  • mmc.exe
  • mostat.exe
  • Mpftray.exe
  • msblast.exe
  • mscnt.exe
  • msconfig.exe
  • msconfig32.exe
  • mspmspv.exe
  • MWSOEMON.EXE
  • NAVAPSVC.EXE
  • NAVW32.exe
  • netmon.exe
  • netstat.exe
  • Nip.exe
  • NISUM.EXE
  • NJEEVES.EXE
  • NMain.exe
  • NPROTECT.EXE
  • NPSSVC.EXE
  • nvcoas.exe
  • NVCSCHED.EXE
  • Nymse.exe
  • ollydbg.exe
  • optimize.exe
  • PAVFIRES.exe
  • Pavproxy.exe
  • persfw.exe
  • portmon.exe
  • PrecisionTime.exe
  • procdump.exe
  • processmonitor.exe
  • rcp32.exe
  • regedit.exe
  • regmon.exe
  • rmss.exe
  • SAVSCAN.EXE
  • scvhosts.exe
  • SearchUpgrader.exe
  • Smc.exe
  • smc.exe
  • SNDSrvc.exe
  • sniffem.exe
  • spidernt.exe
  • spoolsrv.exe
  • stinger.exe
  • SVCH0ST.EXE
  • SVCHOSL.PIF
  • svchosts.exe
  • svcnet.exe
  • svshosts.exe
  • symlcsvc.exe
  • SymWSC.exe
  • SYS_ALERT.EXE
  • syscfg32.exe
  • sysmon.exe
  • system32.exe
  • taskkill.exe
  • tasklist.exe
  • TaskMan.exe
  • TBPSSvc.exe
  • tcpview.exe
  • TeaTimer.exe
  • Tmntsrv.exe
  • tskill.exe
  • updmgr.exe
  • VetMsg.exe
  • videodrv.exe
  • ViewMgr.exe
  • VirtualBouncer.exe
  • vsmain.exe
  • Weather.exe
  • WeatherOnTray.exe
  • WebRebates0.exe
  • WebRebates1.exe
  • WebSavingsFromEbates0.exe
  • WebSavingsFromEbates1.exe
  • winka.exe
  • winppr32.exe
  • winsrv32.exe
  • winupdat.exe
  • winupdt.exe
  • wml.exe
  • WUAUMQR.exe
  • xcommsvr.exe
  • Zanda.exe
  • zapro.exe
  • zlclient.exe
  • Zlh.exe
  • zonealarm.exe

It also deletes the following antivirus and firewall-related registry entry values:

  • 3Dfx Acc
  • ActivSurf
  • AdobeA
  • Adservice
  • Advapi
  • AIM reminder
  • alchem
  • Alevir
  • Alogserv
  • Antivirus
  • AnVir
  • Aornum
  • Apvxd
  • Apvxdwin
  • Arupld32
  • Atrack
  • au.exe
  • ausvc
  • auxAudioDevice
  • Avast32
  • AvconsoleEXE
  • AVG_CC
  • avgcc32
  • Avgserv9.exe
  • AvMaiSrv
  • avpcc
  • avserve.exe
  • avserve2.exe
  • avserve3.exe
  • avx communicator
  • avxlni
  • awhost32
  • Backwork
  • BagleAV
  • bargains
  • bitdefenderlive
  • BlackIce Utility
  • blah service
  • BMail Installation
  • Bnexe
  • BOCleanautostart
  • Bonzi Buddy
  • BullguardoptIn
  • Bymer.Scanner
  • cAgOu
  • CC2KUI
  • ccApp
  • Ccevtmgr
  • Ccpxysvc
  • ccRegVfy
  • Cd_load
  • Choke
  • CLICKTHEBUTTON
  • Cmgrdian
  • CnsMin
  • ColdLife
  • ColdLife - icmp
  • Com%20Services
  • Comsocks
  • config32.exe
  • Config33.exe
  • Configuration Loader
  • Configuration Manager
  • Configuration Wizard
  • CoreSrv
  • couponsandoffers
  • Cpdclnt
  • CriticalUpdate
  • d3dupdate.exe
  • Debug
  • Default
  • DELETE ME
  • Device Configuration Loader
  • Diagnostic Agent
  • DirectX 9.0 Beta Compiler
  • Disk Defragmenter
  • distributed.net client
  • dlder
  • DownloadWare
  • Driver32
  • drvddll.exe
  • Drvddll_exe
  • drvsys.exe
  • DrWebScheduler
  • Dvp95
  • Eac_Cnry
  • EbatesMoeMoneyMaker
  • eixfi
  • Element
  • erthgdr
  • explore
  • explorer
  • Explorer de la dc
  • Explorer32
  • ExplorerTask
  • FirewallSvr
  • F-StopW
  • FuckCop
  • fuckyou
  • Generic Host Process for Win32 Services
  • Generic Service Process
  • GForce4DR
  • GForce4DRv
  • Gforce4DRv
  • GhostStartTrayApp
  • Gremlin
  • HookSys
  • Hotbar
  • icmp
  • ICQ Net
  • IELoader32
  • iestart
  • Internat32.exe
  • InternetConfigure
  • Jammer2nd
  • JavaVM
  • KasperskyAv
  • KasperskyAVEng
  • Kernel32
  • KernelFaultChk
  • Kernell32
  • LangSupportEx
  • load32
  • LoadBlackD
  • LoadDBackUp
  • Loader
  • LoadFonts
  • LoadOrderVerification
  • LoadWinConf
  • lsasss.exe
  • McAfee Firewall
  • McAfee.InstantUpdate.Monitor
  • McAfeeVirusScanService
  • MCAgentExe
  • MCUpdateExe
  • messnger
  • Microsoft 16Bit Update
  • Microsoft AUT Update
  • Microsoft Config Loader
  • Microsoft Configuration
  • Microsoft Diagnostic
  • Microsoft IIS
  • Microsoft Internet
  • Microsoft Netview
  • Microsoft QMGR
  • Microsoft Services
  • Microsoft System Monitor
  • Microsoft Update
  • Microsoft Update Mechene
  • Microsoft Update Time
  • Microsoft Updates
  • Microsoft Windows WKS Service
  • Microsoft(R) Help Center
  • Mmsystem
  • mnsvc
  • MPFExe
  • MprHTML
  • MS Sound Config 16bit
  • Ms Spool32
  • MSAdmin
  • Mscnt
  • MSConfig
  • msconfigurator
  • msdos423
  • msgsrv32
  • msgsvr32
  • MSKernel32
  • MSREGIT
  • Mswincfg
  • MSWinSrv32
  • murphy shield
  • MxHLp32
  • Myapp
  • MyWebSearch Email Plugin
  • NAV Agent
  • NAV Configuration Wizard
  • NAV DefAlert
  • NAV Live Update
  • navapw32
  • NCplDeamon
  • NeroCheck
  • Netapi
  • Network Connections
  • New.net Startup
  • Nod32CC
  • Norman ZANDA
  • Norton Antivirus AV
  • Norton AntiVirus Key Manager
  • Norton Auto-Protect
  • NsUpdate
  • NT Guard
  • NTFix
  • NTsocket
  • OfficeGuard RegChecker
  • Operation 1337
  • PAV.EXE
  • PCStart
  • PersFw
  • Pest Cleaning
  • picture
  • poeto.
  • Pop3trap.exe
  • PPMemCheck
  • print sharing
  • PrinTray
  • procmon
  • Program In Windows
  • QuickTime Task
  • RapApp
  • RavTimeXP
  • RCP protection
  • realplayer
  • redirect
  • Registry
  • Remote Procedure Call Locator
  • REMOVE ME
  • rulaunch
  • Run_cd
  • rundll
  • rundll32
  • Rundllsystem32
  • RunProg
  • SafeSurfingUpdate
  • ScanInicio
  • ScrSvr
  • SearchEnhancement
  • Sentry
  • server
  • serverex
  • service
  • Services
  • Shellapi32
  • sistrai.exe
  • sistray
  • SkynetRevenge
  • SmcService
  • Sound Process
  • SpIDerNT
  • SpybotSD TeaTimer
  • ssdpsrv.exe
  • ssdpsvr.exe
  • Stdstudio
  • Supernova
  • Sustem
  • svced
  • Svchosl
  • svchost.exe
  • SvcHost32
  • svchot
  • SVHOST
  • Svhost Loader
  • svshosts
  • SwimSuitNetwork
  • SymAV
  • SymTray - Norton SystemWorks
  • SyncAgent
  • SysCmd
  • Sysdpt
  • SysInit
  • sysmon
  • SysMonXP
  • SysProtect
  • SysRSCn.exe
  • SysRSCn2.exe
  • SysRSCn3.exe
  • SysScan
  • Sysservice32
  • System Configuration
  • System Efficiency Monitor
  • System Monitor
  • System Restore
  • System Restore Service
  • System Service
  • System Terminal
  • System Tray
  • SystemBoot
  • SystemFTP
  • SystemMD
  • SystemReg
  • SystemSAS
  • System-Service
  • systemtray
  • systemtray32
  • SystemUpdate
  • systray
  • SysTray32
  • SysUpd
  • SYSWB6
  • Task Bar
  • Task Manager
  • TaskMan
  • TaskMonitor
  • TaskReg
  • Taskschd
  • Tau monitor
  • tcactive
  • tcmonitor
  • Tiny Personal Firewall
  • TkBellExe
  • TrackPointSrv
  • TrayX
  • Trickler
  • TrojanScanner
  • tskdbg
  • UMXLDRW
  • Universal Plugin-n-play helper
  • Update
  • Update Service
  • updatek
  • updateWin
  • updmgr
  • updreg
  • VAGuard
  • version
  • Vet Alert
  • Vet Start Up
  • vhostl
  • VirusScan Online
  • vptray
  • vscanner
  • Vshwin32EXE
  • vsmon
  • vsmon.exe
  • VsStatEXE
  • webHancer Agent
  • webHancer Survey Companion
  • webiss
  • WebScan
  • WebScanX
  • Webtrap
  • WebTrapNT.exe
  • WhenUSave
  • WhenUSearch
  • Whvlxd
  • Win Server
  • Win Server Updt
  • win updates
  • Win USB 2.0 USB Driver
  • win_upd2.exe
  • win32
  • Win32 Configuration
  • WIN32 DEBUG
  • Win32 Rundll Loader
  • Win32 Sound Config
  • Win32 USB2 Driver
  • win32app
  • Win32BaseServiceMOD
  • Win32DLL
  • Win32System
  • Win386
  • Winahlp.exe
  • winapidr
  • WinApp32
  • WIN-BUGSFIX
  • WinConfig
  • Windows
  • Windows API Structure
  • windows auto update
  • Windows Automation
  • Windows Config
  • Windows Configuration
  • Windows Driver
  • Windows Explorer
  • Windows Media Player
  • Windows Registry Checker
  • windows sockets start up 32
  • Windows Spooler
  • Windows Subsys
  • Windows Time Server
  • windows update
  • WindowsFix32
  • WindowsMGM
  • WindowsUpdate
  • WinDSNX
  • WinFAT32
  • WinFix32.exe
  • WinGate initialize
  • WinHelp
  • Wininit
  • WinLoader
  • winman32
  • winmgt32
  • WinMsrv32
  • WinProfile
  • WinProxy
  • winpsd
  • winserver
  • Winsock
  • Winsock driver
  • Winsock2 driver
  • Winsock28 driver
  • Winsock32 driver
  • winsockets32
  • Winstart
  • WinSvc16.exe
  • Winsvc32
  • Winsys
  • WinSystem
  • WINTASK
  • winupd32.exe
  • winupdat
  • WinUpdate
  • WinUpdater
  • Winupdt
  • WMedia Player
  • WrCtrl
  • wserver
  • Wupdate driver
  • xpsystem
  • XXXmpeg_pt
  • zlclient
  • Zonavirus
  • Zone Labs Client
  • ZoneAlarm
  • ZoneAlarm Pro
  • zzgshp

Stealth Mechanism

This worm disables registry modification by adding the following registry entry:

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Policies\System
DisableRegistryTools = "dword:00000001"

It also prevents certain processes from running by adding the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Policies\Explorer
DisallowRun = "dword:00000001"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Policies\Explorer\DisallowRun
� 0 = "blackd.exe"
� 1 = "blackice.exe"
� 2 = "lockdown.exe"
� 3 = "lockdown2000.exe"
� 4 = "netmon.exe"
� 5 = "processmonitor.exe"
� 6 = "taskkill.exe"
� 7 = "tskill.exe"
� 8 = "smc.exe"
� 9 = "sniffem.exe"
� 10 = "zapro.exe"
� 11 = "zlclient.exe"
� 12 = "zonealarm.exe"

Backdoor Capabilities

This worm opens port 6667 and acts as a server program controlled by an Internet Relay Chat (IRC) bot.

This worm has backdoor capabilities. It acts as a server program controlled by an IRC bot.

Once connected, this IRC bot is capable of sending commands to the server program. These commands are used to control the target system and the behavior of the bot. These commands are basically categorized as the Bot, Command Manager, Cvar, IRC, Mac, Redirect, and Download commands.

Other Details

It adds the following registry entries to check for updates:

HKEY_LOCAL_MACHINE\Software\Microsoft\Connect
� Filename = "DLLSRV32.EXE"
� Valuename = "RegScan"
� LastMonth = "7"
� RecordUp = "5"





Analysis by: Michael Lactaotao


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.348.01

Pattern release date: Jan 14, 2005


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Identifying the Malware Program

To remove this malware, first identify the malware program.

  1. Scan your system with your Trend Micro antivirus product.
  2. NOTE all files detected as WORM_AGOBOT.AEW.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro�s online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process. You will need the name(s) of the file(s) detected earlier.

  1. Open Windows Task Manager.
    � On Windows NT, 2000, and XP, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the malware file(s) detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. Do the same for all detected malware files in the list of running processes.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

  1. Click Start>Run.
  2. In the Open input box, type:
    command /c copy %WinDir%\regedit.exe regedit.com | regedit.com
  3. Press Enter. Registry Editor should open.
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  5. In the right panel, locate and delete the entry:
    RegScan = "DLLSRV32.EXE -services"
  6. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  7. In the right panel, locate and delete the entry:
    RegScan = "DLLSRV32.EXE -services"
  8. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>Run
  9. In the right panel, locate and delete the entry:
    RegScan = "DLLSRV32.EXE -services"

Addressing Registry Modifications

  1. Still in the Registry Editor, in the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>Windows>
    CurrentVersion>Policies>Explorer>DisallowRun
  2. In the right panel, locate and delete the entry or entries that contain(s) the following data:
    � blackd.exe
    � blackice.exe
    � lockdown.exe
    � lockdown2000.exe
    � netmon.exe
    � processmonitor.exe
    � taskkill.exe
    � tskill.exe
    � smc.exe
    � sniffem.exe
    � zapro.exe
    � zlclient.exe
    � zonealarm.exe
  3. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
  4. Still in the left panel, locate and delete:
    Connect
  5. Close Registry Editor.
  6. Click Start>Run, then type:
    command /c del regedit.com

NOTE: If you were not able to terminate the malware process as described in the previous procedure, restart your system.

Additional Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected systems.

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_AGOBOT.AEW. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other users can use HouseCall, Trend Micro�s free online virus scanner.


Trend Micro offers best-of-breed antivirus and content-security solutions for your corporate network, small and medium business, mobile device or home PC.