Detectando malwares com hijackthis

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Hijackthis é uma ferramenta criada para encontrar e corrigir entradas de registro maliciosas ​​em um computador.

Analisando partes específicas do registro e do disco rígido é possível comparar à configurações consideradas padrão. Se alguma anormalidade for detectada é possível armazenar em um arquivo de log.

Para pessoas não técnicas o arquivo de log não é tão fácil de se analisar, por esse motivo existe um analisador automático. Basta colar o arquivo de log completo na caixa de texto na parte inferior desta página.

Exemplo de arquivo log

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 14:23:38, on 01/10/2010
Platform: Windows Vista  (WinNT 6.00.1904)
MSIE: Internet Explorer v7.00 (7.00.6000.17037)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Windows\system32\taskeng.exe
C:\Program Files\LogMeIn\x86\LogMeInSystray.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\Program Files\ESET\ESET Smart Security\egui.exe
C:\Program Files\Malwarebytes' Anti-Malware\mbamgui.exe
C:\Program Files\Windows Sidebar\sidebar.exe
C:\Program Files\RocketDock\RocketDock.exe
C:\Program Files\WinSnap\WinSnap.exe
C:\Program Files\Windows Sidebar\sidebar.exe
C:\Windows\system32\SearchFilterHost.exe
C:\Users\Patrick\Downloads\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = 0.1.178.7:80
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: 66.36.248.215 www.bb.com.br
O1 - Hosts: 66.36.248.215 bb.com.br
O1 - Hosts: 66.36.248.215 bancodobrasil.com.br
O1 - Hosts: 66.36.248.215 www.bancodobrasil.com.br
O1 - Hosts: 66.36.248.215 bradesco.com.br
O1 - Hosts: 66.36.248.215 www.bradesco.com.br
O2 - BHO: btorbit.com - {000123B4-9B42-4900-B3F7-F4B073EFC214} - C:\Program Files\Orbitdownloader\orbitcth.dll
O2 - BHO: CompSegIB - {2E3C3651-B19C-4DD9-A979-901EC3E930AF} - C:\Program Files\Scpad\scpsssh2.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\Program Files\Microsoft Office\Office12\GrooveShellExtensions.dll
O2 - BHO: Auxiliar de Conexão do Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: DAEMON Tools Toolbar - {32099AAC-C132-4136-9E9A-4E364A424E17} - C:\Program Files\DAEMON Tools Toolbar\DTToolbar.dll
O3 - Toolbar: Grab Pro - {C55BBCD6-41AD-48AD-9953-3609C48EACC7} - C:\Program Files\Orbitdownloader\GrabPro.dll
O4 - HKLM\..\Run: [Windows Defender] %ProgramFiles%\Windows Defender\MSASCui.exe -hide
O4 - HKLM\..\Run: [LogMeIn GUI] "C:\Program Files\LogMeIn\x86\LogMeInSystray.exe"
O4 - HKLM\..\Run: [egui] "C:\Program Files\ESET\ESET Smart Security\egui.exe" /hide /waitservice
O4 - HKLM\..\Run: [Malwarebytes' Anti-Malware] "C:\Program Files\Malwarebytes' Anti-Malware\mbamgui.exe" /starttray
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKCU\..\Run: [RocketDock] "C:\Program Files\RocketDock\RocketDock.exe"
O4 - HKCU\..\Run: [WinSnap] "C:\Program Files\WinSnap\WinSnap.exe" /startup
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-19\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVIÇO DE REDE')
O9 - Extra button: Enviar para o OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~3\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Enviar para o OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~3\Office12\ONBttnIE.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\Office12\REFIEBAR.DLL
O9 - Extra button: Email Extractor - {AFA7DB99-3E4D-4396-94F8-B0B135BCB472} - (no file) (HKCU)
O9 - Extra 'Tools' menuitem: Advanced Email Extractor - {AFA7DB99-3E4D-4396-94F8-B0B135BCB472} - (no file) (HKCU)
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - C:\Program Files\Microsoft Office\Office12\GrooveSystemServices.dll
O21 - SSODL: CompIBBrd - {A3717295-941D-416F-9384-ED1736729F1C} - C:\Program Files\Scpad\scpLIB.dll
O22 - SharedTaskScheduler: Component Categories cache daemon - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\Windows\system32\browseui.dll
O22 - SharedTaskScheduler: scpLIB - {A3717295-941D-416F-9384-ED1736729F1C} - C:\Program Files\Scpad\scpLIB.dll
O23 - Service: Autodesk Licensing Service - Autodesk - C:\Program Files\Common Files\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: ESET HTTP Server (EhttpSrv) - ESET - C:\Program Files\ESET\ESET Smart Security\EHttpSrv.exe
O23 - Service: ESET Service (ekrn) - ESET - C:\Program Files\ESET\ESET Smart Security\ekrn.exe
O23 - Service: FLEXnet Licensing Service - Acresso Software Inc. - C:\Program Files\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: LMIGuardianSvc - LogMeIn, Inc. - C:\Program Files\LogMeIn\x86\LMIGuardianSvc.exe
O23 - Service: LogMeIn - LogMeIn, Inc. - C:\Program Files\LogMeIn\x86\LogMeIn.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Program Files\Malwarebytes' Anti-Malware\mbamservice.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - NVIDIA Corporation - C:\Windows\system32\nvvsvc.exe
O23 - Service: PnkBstrA - Unknown owner - C:\Windows\system32\PnkBstrA.exe
O23 - Service: Protexis Licensing V2 (PSI_SVC_2) - Protexis Inc. - c:\Program Files\Common Files\Protexis\License Service\PsiService_2.exe
O23 - Service: scpVista - Scopus Tecnologia Ltda - C:\Program Files\Scpad\scpVista.exe
O23 - Service: StarWind AE Service (StarWindServiceAE) - Rocket Division Software - C:\Program Files\Alcohol Soft\Alcohol 120\StarWind\StarWindServiceAE.exe

--
End of file - 6641 bytes

Problema encontrado

A parte do log analisado encontrou-se as seguintes alterações.

O1 - Hosts: 66.36.248.215 www.bb.com.br
O1 - Hosts: 66.36.248.215 bb.com.br
O1 - Hosts: 66.36.248.215 bancodobrasil.com.br
O1 - Hosts: 66.36.248.215 www.bancodobrasil.com.br
O1 - Hosts: 66.36.248.215 bradesco.com.br
O1 - Hosts: 66.36.248.215 www.bradesco.com.br

Nesta caso específico é possível identificar que ocorreu uma alteração dos hosts da máquina analisado. Todas as conexões para os sites listados são direcionadas para o ip 66.36.248.215, dessa maneira não ocorre uma consulta a um serviço de resolução de nomes (DNS).

Exercício 1: Colete e analise os logs de sua máquina

  1. Que informação foi encontrada?
  2. É possível determinar que tudo está certo?
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