Potential COM Object Hijacking Via TreatAs Subkey - Registry

 1title: Potential COM Object Hijacking Via TreatAs Subkey - Registry
 2id: 9b0f8a61-91b2-464f-aceb-0527e0a45020
 3status: test
 4description: Detects COM object hijacking via TreatAs subkey
 5references:
 6    - https://bohops.com/2018/08/18/abusing-the-com-registry-structure-part-2-loading-techniques-for-evasion-and-persistence/
 7author: Kutepov Anton, oscd.community
 8date: 2019/10/23
 9modified: 2023/02/07
10tags:
11    - attack.persistence
12    - attack.t1546.015
13logsource:
14    category: registry_add
15    product: windows
16detection:
17    selection:
18        EventType: 'CreateKey'  # Don't want DeleteKey events
19        TargetObject|contains|all:
20            - 'HKU\'
21            - 'Classes\CLSID\'
22            - '\TreatAs'
23    filter_svchost:
24        # Example of target object by svchost
25        # TargetObject: HKU\S-1-5-21-1098798288-3663759343-897484398-1001_Classes\CLSID\{0003000A-0000-0000-C000-000000000046}\TreatAs
26        Image: 'C:\WINDOWS\system32\svchost.exe'
27    condition: selection and not 1 of filter_*
28falsepositives:
29    - Maybe some system utilities in rare cases use linking keys for backward compatibility
30level: medium