Persistent Asynchronous and Fileless Backdoor

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WMI Event - Filters• The definition of the event to trigger• Takes the form of a WMI query• Be mindful of performance!• These take some practice…• Intrinsic querySELECT * FROM __InstanceOperationEvent WITHIN 30 WHERE((__CLASS = "__InstanceCreationEvent" OR __CLASS ="__InstanceModificationEvent") AND TargetInstance ISA"CIM_DataFile") AND (TargetInstance.Extension = "doc") OR(TargetInstance.Extension = "docx")• Extrinsic querySELECT * FROM Win32_VolumeChangeEvent WHERE EventType = 2
WMI Event - Consumers• The action taken upon firing an event• These are the st<strong>and</strong>ard event consumers:– LogFileEventConsumer– ActiveScriptEventConsumer– NTEventLogEventConsumer– SMTPEventConsumer– Comm<strong>and</strong>LineEventConsumer• Present in the following namespaces:– ROOT\CIMV2– ROOT\DEFAULT
Page 4 and 5: Fact - Attackers are abusing WMI1.
Page 8: Outline1. Abridged History of WMI M
Page 11 and 12: 2010 - Ghost• Utilized permanent
Page 13 and 14: WMI Basics
Page 15 and 16: WMI Basics - Architecture• WMI im
Page 18 and 19: Interacting with WMI
Page 20 and 21: Utilities - wmic.exe• Pentesters
Page 22 and 23: Utilities - wbemtest.exe• The WMI
Page 24 and 25: Utilities• Linux - wmic, wmis, wm
Page 26 and 27: Remote WMI Protocols - DCOM• DCOM
Page 28 and 29: Remote WMI Protocols - WinRM/PowerS
Page 30 and 31: Remote WMI Protocols - WinRM/PowerS
Page 32 and 33: WMI Eventing
Page 34 and 35: WMI Event Type - Intrinsic• Intri
Page 38 and 39: WMI Attacks
Page 40 and 41: WMI - Benefits to an Attacker• Se
Page 42 and 43: WMI Attacks - VM/Sandbox Detection
Page 44 and 45: WMI Attacks - Code Execution and La
Page 46 and 47: WMI Attacks - Data Storage$StaticCl
Page 48 and 49: WMI Attacks - C2 Communication (WMI
Page 50 and 51: WMI Attacks - C2 Communication (Reg
Page 52 and 53: WMI Attacks - Stealthy Command “P
Page 54 and 55: WMI Providers
Page 56 and 57: 3 rd Party WMI Providers• Some 3
Page 58 and 59: WMI Provider Enumeration• Get-Wmi
Page 60 and 61: PoC WMI Backdoor Background• A pu
Page 62 and 63: PoC WMI Backdoor Syntax - New-WMIBa
Page 64 and 65: PoC WMI Backdoor - Examples$Trigger
Page 66 and 67: Attacker Detection with WMI• Pers
Page 68 and 69: Attacker Detection with WMIWMI is t
Page 70 and 71: Mitigations
Page 72 and 73: Thank you!• Valuable input on use

Persistent Asynchronous and Fileless Backdoor

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