Threat Description

Email-Worm:​W32/Bagle.GE

Details

Aliases: W32/Bagle.GE, Email-Worm.Win32.Bagle.ge, Trojan-Downloader.Win32.Bagle.ge
Category: Malware
Type: Email-WormRootkit
Platform: W32

Summary



This type of worm is embedded in an e-mail attachment, and spreads using the infected computer's e-mailing networks.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



Email-Worm:W32/Bagle.GE attempts to disable security related software. It also hides itself and other Bagle components using rootkit techniques.

Installation

When Bagle.GE is run, it creates a directory named 'hidires' in the user's 'Application Data' folder. It copies itself as:

  • %User%\Application Data\hidires\hidr.exe

The trojan also drops the following driver file to the same folder:

  • %User%\Application Data\hidires\m_hook.sys

The trojan installs the following registry launchpoint as a string value:

  • [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "drvsyskit" = "%System%\hidr.exe"

Payload

Bagle.GE tries to disable several AV and other security related software.

Rootkit Details

Bagle.GE loads a kernel-mode driver (m_hook.sys) that it uses to hide itself and another Bagle related malware, Email-Worm:W32/Bagle.GF.

The driver is able to hide the following items:

  • Processes
  • Files and directories
  • Registry keys and values

When it loads it replaces the following function pointers from the system service table:

  • NtCreateFile
  • NtEnumerateKey
  • NtEnumerateValueKey
  • NtQueryDirectoryFile
  • NtQueryKey
  • NtQuerySystemInformation

The driver is configured by the user-mode component (hidr.exe). The following data is sent to define items that will be hidden:

List of hidden processes:

  • hidr.exe
  • wintems.exe
  • filesnamec001.exe
  • filesnamec002.exe
  • filesnamec003.exe
  • filesnamec004.exe
  • filesnamec005.exe
  • filesnamec006.exe

List of hidden files or directories:

  • m_hook.sys
  • ldr64.dll
  • wintems.exe
  • hidr.exe
  • hidires
  • filesnames001.exe
  • filesnames002.exe
  • filesnames003.exe
  • filesnames004.exe
  • filesnames005.exe
  • filesnames006.exe

List of hidden registry keys:

  • nkeyjej1
  • nkeyjej2

List of hidden registry values:

  • drvsyskit
  • german.exe
  • key000s01
  • key000s02
  • key000s03
  • key000s04
  • key000s05

The user-mode component will also send information about image names that will be considered as trusted and will not be affected by any of the hooks:

  • m_hook.sys
  • hidr.exe
  • wintems.exe
  • filesnamec001.exe
  • filesnamec002.exe
  • filesnamec003.exe
  • filesnamec004.exe
  • filesnamec005.exe
  • filesnamec006.exe

The file hiding code is somewhat limited. It is only able to hide a single file from each directory.

The NtCreateFile hook is special. Its sole purpose is to delete any security related files when they are opened. This list is also sent by the user-mode component and consists of the following items:

  • KWatch.EXE
  • livesrv.exe
  • LOCKDOWN2000.EXE
  • LogWatNT.exe
  • lpfw.exe
  • LUALL.EXE
  • LUCOMSERVER.EXE
  • Luupdate.exe
  • MCAGENT.EXE
  • mcmnhdlr.exe
  • mcregwiz.exe
  • Mcshield.exe
  • MCUPDATE.EXE
  • mcvsshld.exe
  • MINILOG.EXE
  • MONITOR.EXE
  • MonSysNT.exe
  • MOOLIVE.EXE
  • MpEng.exe
  • mpssvc.exe
  • MSMPSVC.exe
  • myAgtSvc.exe
  • myagttry.exe
  • navapsvc.exe
  • NAVAPW32.EXE
  • NavLu32.exe
  • NAVW32.EXE
  • NDD32.EXE
  • NeoWatchLog.exe
  • NeoWatchTray.exe
  • NISSERV
  • NISUM.EXE
  • NMAIN.EXE
  • nod32.exe
  • nod32krn.exe
  • nod32kui.exe
  • NORMIST.EXE
  • notstart.exe
  • npavtray.exe
  • NPFMNTOR.EXE
  • npfmsg.exe
  • NPROTECT.EXE
  • NSCHED32.EXE
  • NSMdtr.exe
  • NssServ.exe
  • NssTray.exe
  • ntrtscan.exe
  • NTXconfig.exe
  • NUPGRADE.EXE
  • NVC95.EXE
  • Nvcod.exe
  • Nvcte.exe
  • Nvcut.exe
  • NWService.exe
  • OfcPfwSvc.exe
  • OUTPOST.EXE
  • PAV.EXE
  • PavFires.exe
  • PavFnSvr.exe
  • Pavkre.exe
  • PavProt.exe
  • pavProxy.exe
  • pavprsrv.exe
  • pavsrv51.exe
  • PAVSS.EXE
  • pccguide.exe
  • PCCIOMON.EXE
  • pccntmon.exe
  • PCCPFW.exe
  • PcCtlCom.exe
  • PCTAV.exe
  • PERSFW.EXE
  • pertsk.exe
  • PERVAC.EXE
  • PNMSRV.EXE
  • POP3TRAP.EXE
  • POPROXY.EXE
  • prevsrv.exe
  • PsImSvc.exe
  • QHM32.EXE
  • QHONLINE.EXE
  • QHONSVC.EXE
  • QHPF.EXE
  • qhwscsvc.exe
  • RavMon.exe
  • RavTimer.exe
  • Realmon.exe
  • REALMON95.EXE
  • Rescue.exe
  • rfwmain.exe
  • Rtvscan.exe
  • RTVSCN95.EXE
  • RuLaunch.exe
  • SAVAdminService.exe
  • SAVMain.exe
  • savprogress.exe
  • SAVScan.exe
  • SCAN32.EXE
  • ScanningProcess.exe
  • sched.exe
  • sdhelp.exe
  • SERVIC~1.EXE
  • SHSTAT.EXE
  • SiteCli.exe
  • smc.exe
  • SNDSrvc.exe
  • SPBBCSvc.exe
  • SPHINX.EXE
  • spiderml.exe
  • spidernt.exe
  • Spiderui.exe
  • SpybotSD.exe
  • SPYXX.EXE
  • SS3EDIT.EXE
  • stopsignav.exe
  • swAgent.exe
  • swdoctor.exe
  • SWNETSUP.EXE
  • symlcsvc.exe
  • SymProxySvc.exe
  • SymSPort.exe
  • SymWSC.exe
  • SYNMGR.EXE
  • TAUMON.EXE
  • TBMon.exe
  • TC.EXE
  • tca.exe
  • TCM.EXE
  • TDS-3.EXE
  • TeaTimer.exe
  • TFAK.EXE
  • THAV.EXE
  • THSM.EXE
  • Tmas.exe
  • tmlisten.exe
  • Tmntsrv.exe
  • TmPfw.exe
  • tmproxy.exe
  • TNBUtil.exe
  • TRJSCAN.EXE
  • Up2Date.exe
  • UPDATE.EXE
  • UpdaterUI.exe
  • upgrepl.exe
  • Vba32ECM.exe
  • Vba32ifs.exe
  • vba32ldr.exe
  • Vba32PP3.exe
  • VBSNTW.exe
  • vchk.exe
  • vcrmon.exe
  • VetTray.exe
  • VirusKeeper.exe
  • VPTRAY.EXE
  • vrfwsvc.exe
  • VRMONNT.EXE
  • vrmonsvc.exe
  • vrrw32.exe
  • VSECOMR.EXE
  • Vshwin32.exe
  • vsmon.exe
  • vsserv.exe
  • VsStat.exe
  • WATCHDOG.EXE
  • WebProxy.exe
  • Webscanx.exe
  • WEBTRAP.EXE
  • WGFE95.EXE
  • Winaw32.exe
  • winroute.exe
  • winss.exe
  • winssnotify.exe
  • WRADMIN.EXE
  • WRCTRL.EXE
  • xcommsvr.exe
  • zatutor.exe
  • ZAUINST.EXE
  • zlclient.exe
  • zonealarm.exe
  • _AVP32.EXE
  • _AVPCC.EXE
  • _AVPM.EXE

In addition, the driver contains code that will prevent certain security related processes and kernel-mode modules from running. However, this code is not yet in use.






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