Ransom.Win32.MOUNTLOCKER.B
a variant of Win32/GenKryptik.EWOG trojan (NOD32)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes itself after execution.
It avoids encrypting files with the following file extensions.
TECHNICAL DETAILS
Arrival Details
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Ransomware drops the following files:
- %User Temp%\{random characters}.tmp -> contains base-64 encoded powershell commands
- %User Temp%\{random characters}.bat -> contains commmands to delete original malware executable
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It adds the following processes:
- vssadmin.exe delete shadows /all /Quiet
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- {Generated characters from volume serial ID}
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_CURRENT_USER\Software\Classes\
{Generated ID}\shell\Open\
command
(Default) = explorer.exe RecoveryManual.html -> causes the opening of ransom note when an encrypted file is opened
Adware Routine
This Ransomware deletes itself after execution.
Information Theft
This Ransomware gathers the following data:
- Computer Name -> used for generating ID
Other Details
This Ransomware does the following:
- Terminates running services if service path does not contain the string "\WINDOWS\"
- Terminates running processes if executable path does not contain the string "\WINDOWS\" and if the process name does not contain the following:
- firefox.exe
- chrome.exe
- iexplore.exe
- tor.exe
- powershell.exe
- mfeatp.exe
- mfehcs.exe
- mfefire.exe
- mfeesp.exe
- macompatsvc.exe
- MarService.exe
- mfetp.exe
- mfevtps.exe
- macmnsvc.exe
- masvc.exe
- mfemactl.exe
- epintegrationservice.exe
- bdredline.exe
- epprotectedservice.exe
- epsecurityservice.exe
- epupdateservice.exe
- epag.exe
- kavfswp.exe
- klnagent.exe
- vapm.exe
- kavfs.exe
- ServiceRequest.exe
- cptrayUI.exe
- ThreatLockerTray.exe
- WRSA.exe
- mbam.exe
- mbamtray.exe
- MBAMService.exe
- KeyPass.exe
- avgui.exe
- emet_agent.exe
- emet_service.exe
- firesvc.exe
- firetray.exe
- hipsvc.exe
- mfevtps.exe
- mcafeefire.exe
- scan32.exe
- shstat.exe
- tbmon.exe
- vstskmgr.exe
- engineserver.exe
- mfevtps.exe
- mfeann.exe
- mcscript.exe
- updaterui.exe
- udaterui.exe
- naprdmgr.exe
- frameworkservice.exe
- cleanup.exe
- cmdagent.exe
- frminst.exe
- mcscript_inuse.exe
- mctray.exe
- mcshield.exe
- AAWTray.exe
- Ad-Aware.exe
- MSASCui.exe
- _avp32.exe
- _avpcc.exe
- _avpm.exe
- aAvgApi.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
- atwatch.exe
- au.exe
- aupdate.exe
- auto-protect.nav80try.exe
- autodown.exe
- autotrace.exe
- autoupdate.exe
- avconsol.exe
- ave32.exe
- avgcc32.exe
- avgctrl.exe
- avgemc.exe
- avgnt.exe
- avgrsx.exe
- avgserv.exe
- avgserv9.exe
- avguard.exe
- avgw.exe
- avkpop.exe
- avkserv.exe
- avkservice.exe
- avkwctl9.exe
- avltmain.exe
- avnt.exe
- avp.exe
- avp.exe
- avp32.exe
- avpcc.exe
- avpdos32.exe
- avpm.exe
- avptc32.exe
- avpupd.exe
- avsched32.exe
- avsynmgr.exe
- avwin.exe
- avwin95.exe
- avwinnt.exe
- avwupd.exe
- avwupd32.exe
- avwupsrv.exe
- avxmonitor9x.exe
- avxmonitornt.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
- blink.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
- ccsvchst.exe
- ccSvcHst.exe
- cdp.exe
- cfd.exe
- cfgwiz.exe
- cfiadmin.exe
- cfiaudit.exe
- cfinet.exe
- cfinet32.exe
- claw95.exe
- claw95cf.exe
- clean.exe
- cleaner.exe
- cleaner3.exe
- cleanpc.exe
- click.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
- EMET_Agent.exe
- EMET_Service.exe
- emsw.exe
- ent.exe
- esafe.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-prot.exe
- f-prot95.exe
- f-stopw.exe
- fameh32.exe
- fast.exe
- fch32.exe
- fih32.exe
- findviru.exe
- firewall.exe
- fnrb32.exe
- fp-win.exe
- fp-win_trial.exe
- fprot.exe
- frw.exe
- fsaa.exe
- fsav.exe
- fsav32.exe
- fsav530stbyb.exe
- fsav530wtbyb.exe
- fsav95.exe
- fsgk32.exe
- fsm32.exe
- fsma32.exe
- fsmb32.exe
- gator.exe
- gbmenu.exe
- gbpoll.exe
- generics.exe
- gmt.exe
- guard.exe
- guarddog.exe
- hacktracersetup.exe
- hbinst.exe
- hbsrv.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
- icsuppnt.exe
- idle.exe
- iedll.exe
- iedriver.exe
- iface.exe
- ifw2000.exe
- inetlnfo.exe
- infus.exe
- infwin.exe
- init.exe
- intdel.exe
- intren.exe
- iomon98.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
- LockAppHost.exe
- LockApp.exe
- lockdown.exe
- lockdown2000.exe
- lookout.exe
- lordpe.exe
- lsetup.exe
- luall.exe
- luau.exe
- lucomserver.exe
- luinit.exe
- luspt.exe
- mapisvc32.exe
- mcagent.exe
- mcmnhdlr.exe
- mcshield.exe
- mctool.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
- 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
- nvarch16.exe
- nvc95.exe
- nvsvc32.exe
- nwinst4.exe
- nwservice.exe
- nwtool16.exe
- ollydbg.exe
- onsrvr.exe
- optimize.exe
- ostronet.exe
- otfix.exe
- outpost.exe
- outpostinstall.exe
- outpostproinstall.exe
- padmin.exe
- panixk.exe
- patch.exe
- pavcl.exe
- pavproxy.exe
- pavsched.exe
- pavw.exe
- pccwin98.exe
- pcfwallicon.exe
- pcip10117_0.exe
- pcscan.exe
- pdsetup.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
- 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.exescan32.exe
- shstat.exe
- tbmon.exe
- vstskmgr.exe
- engineserver.exe
- mfevtps.exe
- mfeann.exe
- mcscript.exe
- updaterui.exe
- udaterui.exe
- naprdmgr.exe
- frameworkservice.exe
- cleanup.exe
- cmdagent.exe
- frminst.exe
- mcscript_inuse.exe
- mctray.exe
- mcshield.exe
- save.exe
- savenow.exe
- sbserv.exe
- sc.exe
- scam32.exe
- scan32.exe
- scan95.exe
- scanpm.exe
- scrscan.exe
- serv95.exe
- setup_flowprotector_us.exe
- setupvameeval.exe
- sfc.exe
- sgssfw32.exe
- sh.exe
- shellspyinstall.exe
- shn.exe
- showbehind.exe
- smc.exe
- Smc.exe
- SmcGui.exe
- sms.exe
- smss32.exe
- SymCorpUI.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
- svchostc.exe
- svchosts.exe
- sweep95.exe
- sweepnet.sweepsrv.sys.swnetsup.exe
- symproxysvc.exe
- symtray.exe
- sysedit.exe
- sysupd.exe
- taskmg.exe
- taskmo.exe
- taumon.exe
- tbscan.exe
- tc.exe
- tca.exe
- tcm.exe
- tds-3.exe
- tds2-98.exe
- tds2-nt.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
- 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
- whoswatchingme.exe
- wimmun32.exe
- win-bugsfix.exe
- win32.exe
- win32us.exe
- winactive.exe
- window.exe
- windows.exe
- wininetd.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
It accepts the following parameters:
- /log:(C|F) - record activity via console (C) or via file (F)
- /scan: {(l|L)|(n|N)|(s|S)} - choose to infect only local (l|L) drives, or only network (n|N) drives, or network shares (s|S)
- /marker:{Filename} drops an infection marker file in infected drive
- /nodel - will not drop and execute the batch file which will delete the malware files
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file name:
- RecoverManual.html
It avoids encrypting files with the following strings in their file path:
- :\Windows\
- :\System Volume Information\
- :\$RECYCLE.BIN\
- :\SYSTEM.SAV
- :\WINNT
- :\$WINDOWS.~BT\
- :\Windows.old\
- :\PerfLog\
- \WindowsApps\
- \Microsoft\Windows\
- \Roaming\Microsoft\
- \Local\Microsoft\
- \LocalLow\Microsoft\
- :\ProgramData\Microsoft\
- \Local\Packages\
- :\ProgramData\Packages\
- \Windows Defender\
- \microsoft shared\
- \Google\Chrome\
- \Mozilla Firefox\
- \Mozilla\Firefox\
- \Internet Explorer\
- \MicrosoftEdge\
- \Tor Browser\
- \AppData\Local\Temp\
It appends the following extension to the file name of the encrypted files:
- .ReadManual.{Generated ID}
It leaves text files that serve as ransom notes containing the following text:
- {encrypted directory}\RecoverManual.html
It avoids encrypting files with the following file extensions:
- exe
- dll
- sys
- msi
- mui
- inf
- cat
- bat
- cmd
- ps1
- vbs
- ttf
- fon
- lnk
- ReadManual.{Generated ID}
SOLUTION
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- Troj.Win32.TRX.XXPE50FFF039
Step 2
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 3
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 4
Identify and terminate files detected as Ransom.Win32.MOUNTLOCKER.B
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 5
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Classes\{Generated ID}\shell\Open\command
- (Default) = explorer.exe RecoveryManual.html
- (Default) = explorer.exe RecoveryManual.html
Step 6
Search and delete this file
- %User Temp%\{random characters}.tmp -> contains base-64 encoded powershell commands
- %User Temp%\{random characters}.bat -> contains commmands to delete original malware executable
- {encrypted directory}\RecoveryManual.html
Step 7
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.MOUNTLOCKER.B. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:
Step 8
Restore encrypted files from backup.
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