Persistence Via New SIP Provider — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2022-07-21 / 2023-08-17.

{
  "category": "registry_set",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 3bcd6abed0c06f2e81b5050dbed6b1460d5cdfe6a5bde5ae4c5a85f7332aac50

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Persistence Via New SIP Provider
id: 5a2b21ee-6aaa-4234-ac9d-59a59edf90a1
status: test
description: Detects when an attacker register a new SIP provider for persistence and defense evasion
references:
    - https://persistence-info.github.io/Data/codesigning.html
    - https://github.com/gtworek/PSBits/tree/master/SIP
    - https://specterops.io/assets/resources/SpecterOps_Subverting_Trust_in_Windows.pdf
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-21
modified: 2023-08-17
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1553.003
logsource:
    category: registry_set
    product: windows
detection:
    selection_root:
        TargetObject|contains:
            - '\SOFTWARE\Microsoft\Cryptography\Providers\'
            - '\SOFTWARE\Microsoft\Cryptography\OID\EncodingType'
            - '\SOFTWARE\WOW6432Node\Microsoft\Cryptography\Providers\'
            - '\SOFTWARE\WOW6432Node\Microsoft\Cryptography\OID\EncodingType'
    selection_dll:
        TargetObject|contains:
            - '\Dll'
            - '\$DLL'
    filter:
        Details:
            # Add more legitimate SIP providers according to your env
            - WINTRUST.DLL
            - mso.dll
    filter_poqexec:
        Image: 'C:\Windows\System32\poqexec.exe'
        TargetObject|contains: '\CryptSIPDll'
        Details: 'C:\Windows\System32\PsfSip.dll'
    condition: all of selection_* and not 1 of filter*
falsepositives:
    - Legitimate SIP being registered by the OS or different software.
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate SIP being registered by the OS or different software.

Source references

• https://persistence-info.github.io/Data/codesigning.html
• https://github.com/gtworek/PSBits/tree/master/SIP
• https://specterops.io/assets/resources/SpecterOps_Subverting_Trust_in_Windows.pdf