Worm/Mytob.KK - Worm

See also

Summary

Full description

Statistics

Virus:	Worm/Mytob.KK
Date discovered:	10/10/2005
Type:	Worm
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	49.664 Bytes
MD5 checksum:	89504c8c2ddd5f051ed07078381cd932
VDF version:	6.32.00.69 - Sun, 09 Oct 2005 16:22 (GMT+1)

General Method of propagation:
   • Email

Aliases:
   • Symantec: W32.Mytob@mm
   • Kaspersky: Email-Worm.Win32.Doombot.b
   • TrendMicro: WORM_MYTOB.LD
   • Bitdefender: Win32.Worm.Mytob.HG

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

Side effects:
   • Blocks access to certain websites
   • Blocks access to security websites
   • Disable security applications
   • Uses its own Email engine
   • Lowers security settings
   • Registry modification

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

Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
• "RAX SYSTEM"="scrigz.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
• "RAX SYSTEM"="scrigz.exe"

Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:

From:
Generated addresses. Please do not assume that it was the sender's intention to send this email to you. He might not know about his infection or might not even be infected at all. Furthermore it is possible that you will receive bounced emails telling you that you are infected. This might also not be the case.

To:
– Email addresses found in specific files on the system.

Subject:
One of the following:
   • *DETECTED* Online User Violation
   • Email Account Suspension
   • Important Notification
   • Members Support
   • Notice of account limitation
   • Security measures
   • Warning Message: Your services near to be closed.
   • You have successfully updated your password
   • Your Account is Suspended
   • Your Account is Suspended For Security Reasons
   • Your new account password is approved
   • Your password has been successfully updated
   • Your password has been updated

In some cases the subject might also be empty.
Furthermore the subject line could contain random letters.

Body:
– Contains HTML code.
– The body contains random characters.
The body of the email is one of the following:

   • Dear user %username from receivers email address%,

     You have successfully updated the password of your %recipient's domain% account.

     If you did not authorize this change or if you need assistance with your account, please contact %recipient's domain% customer service at: admin@%recipient's domain%

     Thank you for using %recipient's domain%!
     The %recipient's domain% Support Team

   • Dear user %username from receivers email address%,

     It has come to our attention that your %recipient's domain% User Profile ( x ) records are out of date. For further details see the attached document.

     Thank you for using %recipient's domain%!
     The %recipient's domain% Support Team

   • Dear %recipient's domain% Member,

     Your e-mail account was used to send a huge amount of unsolicited spam messages during the recent week. If you could please take 5-10 minutes out of your online experience and confirm the attached document so you will not run into any future problems with the online service.

     If you choose to ignore our request, you leave us no choice but to cancel your membership.

     Virtually yours,
     The %recipient's domain% Support Team

   • Dear %recipient's domain% Member,

     We have temporarily suspended your email account %reciever email address%.

     This might be due to either of the following reasons:

     1. A recent change in your personal information (i.e. change of address).
     2. Submiting invalid information during the initial sign up process.
     3. An innability to accurately verify your selected option of subscription due to an internal error within our processors.
     See the details to reactivate your Yahoo account.

     Sincerely,The %recipient's domain% Support Team

Continued by the following:

   • +++ Attachment: No Virus (Clean)
     +++ %recipient's domain% Antivirus - www.%recipient's domain%.com

   • +++ Attachment: No Virus found
     +++ %recipient's domain% Antivirus - www.%recipient's domain%.com

Attachment:
The filenames of the attachments is constructed out of the following:

– It starts with one of the following:
   • readme
   • document
   • account-info
   • email-details
   • account-details
   • important-details
   • accepted-password
   • account-password
   • approved-password
   • password
   • new-password
   • email-password
   • updated-password
   • %random character string%

Continued by one of the following:
    The file extension is one of the following:
   • .zip

Here is an example of how the filename of the attachment might look like:
   • password.zip

Mailing Address generation for TO field:
To generate addresses it uses the following strings:
   • adam; alex; andrew; anna; bill; bob; brenda; brent; brian; claudia;
      dan; dave; david; debby; frank; fred; george; helen; jack; james;
      jane; jerry; jim; jimmy; joe; john; jose; josh; julie; kevin; leo;
      linda; maria; mary; matt; michael; mike; paul; peter; ray; robert;
      sales; sam; serg; smith; stan; steve; ted; tom

It combines the result with domains that were found in files, which were previously searched for addresses.

Here you can find examples of generated addresses:
   • tom@yahoo.com
   • jack@yahoo.com

Address generation for FROM field:
To generate addresses it uses the following strings:
   • admin
   • administrator
   • info
   • mail
   • register
   • service
   • support
   • webmaster

Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • be_loyal; -._!; -._!@; .edu; .gov; .mil; abuse; accoun; acketst;
      admin; anyone; arin.; avp; berkeley; borlan; bsd; bugs; certific;
      contact; example; fcnz; feste; fido; foo.; fsf.; gnu; gold-certs;
      google; gov.; help; hotmail; iana; ibm.com; icrosof; icrosoft; ietf;
      info; inpris; isc.o; isi.e; kernel; linux; listserv; math; mit.e;
      mozilla; msn.; mydomai; nobody; nodomai; noone; not; nothing; ntivi;
      page; panda; pgp; postmaster; privacy; rating; rfc-ed; ripe.; root;
      ruslis; samples; secur; sendmail; service; site; soft; somebody;
      someone; sopho; spm; submit; support; syma; tanford.e; the.bat; unix;
      usenet; utgers.ed; webmaster; www; you; your

Prepend MX strings:
In order to get the IP address of the mail server it has the ability to prepend the following strings to the domain name:
   • gate.
   • ns.
   • relay.
   • mail1.
   • mxs.
   • mx1.
   • smtp.
   • mail.
   • mx.

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

Server: rax.**********hax.info
Port: 43287
Channel: #skyellite
Nickname: [X]%six-digit random character string%
Password: ellite

– This malware has the ability to collect and send information such as:
    • Free memory
    • Size of memory
    • Information about the Windows operating system

– Furthermore it has the ability to perform actions such as:
    • connect to IRC server
    • Download file
    • Execute file
    • Updates itself
    • Visit a website

Hosts The host file is modified as explained:

– In this case existing entries are deleted.

– Access to the following domains is effectively blocked:
   • www.symantec.com; securityresponse.symantec.com; symantec.com;
      www.sophos.com; sophos.com; www.mcafee.com; mcafee.com;
      liveupdate.symantecliveupdate.com; www.viruslist.com; viruslist.com;
      f-secure.com; www.f-secure.com; kaspersky.com; kaspersky-labs.com;
      www.avp.com; www.kaspersky.com; avp.com; www.networkassociates.com;
      networkassociates.com; www.ca.com; ca.com; mast.mcafee.com;
      my-etrust.com; www.my-etrust.com; download.mcafee.com;
      dispatch.mcafee.com; secure.nai.com; nai.com; www.nai.com;
      update.symantec.com; updates.symantec.com; us.mcafee.com;
      liveupdate.symantec.com; customer.symantec.com; rads.mcafee.com;
      trendmicro.com; pandasoftware.com; www.pandasoftware.com;
      www.trendmicro.com; www.grisoft.com; www.microsoft.com; microsoft.com;
      www.virustotal.com; virustotal.com; www.amazon.com; www.amazon.co.uk;
      www.amazon.ca; www.amazon.fr; www.paypal.com; paypal.com;
      moneybookers.com; www.moneybookers.com; www.ebay.com; ebay.com

– Access to the following domain is redirected to another destination:
   • avmailserverlocal

The modified host file will look like this:

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; ATWATCH.EXE; AU.EXE;
      AUPDATE.EXE; AUTODOWN.EXE; AUTO-PROTECT.NAV80TRY.EXE; AUTOTRACE.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; AVSCHED32.EXE; AVSYNMGR.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;
      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; CFINET.EXE;
      CFINET32.EXE; CLAW95CF.EXE; CLEAN.EXE; CLEANER.EXE; CLEANER3.EXE;
      CLEANPC.EXE; CLICK.EXE; CMD.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; ESCANHNT.EXE;
      ESCANV95.EXE; ESPWATCH.EXE; ETHEREAL.EXE; ETRUSTCIPE.EXE; EVPN.EXE;
      EXANTIVIRUS-CNET.EXE; EXE.AVXW.EXE; EXPERT.EXE; EXPLORE.EXE;
      FAMEH32.EXE; FAST.EXE; FCH32.EXE; FIH32.EXE; FINDVIRU.EXE;
      FIREWALL.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; HOTACTIO.EXE;
      HOTPATCH.EXE; HTLOG.EXE; HTPATCH.EXE; HWPE.EXE; HXDL.EXE; HXIUL.EXE;
      IAMAPP.EXE; IAMSERV.EXE; IAMSTATS.EXE; IBMASN.EXE; IBMAVSP.EXE;
      ICLOADNT.EXE; ICMON.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; 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;
      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; NEC.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; 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.EXE; SAVE.EXE;
      SAVENOW.EXE; SBSERV.EXE; SC.EXE; SCAM32.EXE; SCAN32.EXE; SCAN95.EXE;
      SCANPM.EXE; SCRSCAN.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-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; 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; 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

The following service is disabled:
   • SharedAccess (Windows Firewall/Internet Connection Sharing (ICS))

Miscellaneous Anti debugging
It checks if the following file is present:
• %PROGRAM FILES%\szmatec\guard.exe

If successful, it terminates immediately.

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• PESpin

See a brief description here.

Description inserted by Iulian Popa on Thu, 27 Oct 2005 13:36 (GMT+1)
Description updated by Iulian Popa on Fri, 04 Nov 2005 15:40 (GMT+1)

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