SIP Provider Modification

Identifies modifications to the registered Subject Interface Package (SIP) providers. SIP providers are used by the Windows cryptographic system to validate file signatures on the system. This may be an attempt to bypass signature validation checks or inject code into critical processes.

Rule type: eql

Rule indices:

logs-endpoint.events.registry-*
endgame-*
logs-windows.sysmon_operational-*
winlogbeat-*
logs-m365_defender.event-*
logs-sentinel_one_cloud_funnel.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://github.com/mattifestation/PoCSubjectInterfacePackage

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Elastic Endgame
Data Source: Elastic Defend
Data Source: Sysmon
Data Source: Microsoft Defender for Endpoint
Data Source: SentinelOne

Version: 310

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

registry where host.os.type == "windows" and event.type == "change" and registry.value : ("Dll", "$Dll") and
  registry.path: (
    "*\\SOFTWARE\\Microsoft\\Cryptography\\OID\\EncodingType 0\\CryptSIPDllPutSignedDataMsg\\{*}\\Dll",
    "*\\SOFTWARE\\WOW6432Node\\Microsoft\\Cryptography\\OID\\EncodingType 0\\CryptSIPDllPutSignedDataMsg\\{*}\\Dll",
    "*\\SOFTWARE\\Microsoft\\Cryptography\\Providers\\Trust\\FinalPolicy\\{*}\\$Dll",
    "*\\SOFTWARE\\WOW6432Node\\Microsoft\\Cryptography\\Providers\\Trust\\FinalPolicy\\{*}\\$Dll"
    ) and
  registry.data.strings:"*.dll" and
  not (process.name : "msiexec.exe" and registry.data.strings : "mso.dll") and
  not (process.name : "regsvr32.exe" and registry.data.strings == "WINTRUST.DLL")

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Subvert Trust Controls
- ID: T1553
- Reference URL: https://attack.mitre.org/techniques/T1553/
Sub-technique:
- Name: SIP and Trust Provider Hijacking
- ID: T1553.003
- Reference URL: https://attack.mitre.org/techniques/T1553/003/

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