Removal of Potential COM Hijacking Registry Keys

 1title: Removal of Potential COM Hijacking Registry Keys
 2id: 96f697b0-b499-4e5d-9908-a67bec11cdb6
 3status: test
 4description: |
 5    Detects any deletion of entries in ".*\shell\open\command" registry keys.
 6    These registry keys might have been used for COM hijacking activities by a threat actor or an attacker and the deletion could indicate steps to remove its tracks.    
 7references:
 8    - https://github.com/OTRF/detection-hackathon-apt29/issues/7
 9    - https://github.com/OTRF/ThreatHunter-Playbook/blob/2d4257f630f4c9770f78d0c1df059f891ffc3fec/docs/evals/apt29/detections/3.C.1_22A46621-7A92-48C1-81BF-B3937EB4FDC3.md
10    - https://learn.microsoft.com/en-us/windows/win32/shell/launch
11    - https://learn.microsoft.com/en-us/windows/win32/api/shobjidl_core/nn-shobjidl_core-iexecutecommand
12    - https://learn.microsoft.com/en-us/windows/win32/shell/shell-and-managed-code
13author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
14date: 2020-05-02
15modified: 2025-10-07
16tags:
17    - attack.defense-evasion
18    - attack.t1112
19logsource:
20    product: windows
21    category: registry_delete
22detection:
23    selection:
24        TargetObject|endswith: '\shell\open\command'
25    filter_main_explorer:
26        Image|endswith: 'C:\Windows\explorer.exe'
27    filter_main_svchost:
28        Image: 'C:\Windows\system32\svchost.exe'
29    filter_main_msiexec:
30        Image:
31            - 'C:\Windows\System32\msiexec.exe'
32            - 'C:\Windows\SysWOW64\msiexec.exe'
33    filter_main_generic_prorams:
34        Image|startswith:
35            - 'C:\Program Files\'
36            - 'C:\Program Files (x86)\'
37    filter_main_openwith:
38        Image: 'C:\Windows\System32\OpenWith.exe'
39    filter_optional_dropbox:
40        Image|endswith: '\Dropbox.exe'
41        # We don't use the HKCR anchor as it could be logged as a different variation (HKEY_CLASSES_ROOT)
42        TargetObject|contains: '\Dropbox.'
43    filter_optional_wireshark:
44        Image|endswith: '\AppData\Local\Temp\Wireshark_uninstaller.exe'
45        # We don't use the HKCR anchor as it could be logged as a different variation (HKEY_CLASSES_ROOT)
46        TargetObject|contains: '\wireshark-capture-file\'
47    filter_optional_peazip:
48        Image|contains: 'peazip'
49        # We don't use the HKCR anchor as it could be logged as a different variation (HKEY_CLASSES_ROOT)
50        TargetObject|contains: '\PeaZip.'
51    filter_optional_everything:
52        Image|endswith: '\Everything.exe'
53        # We don't use the HKCR anchor as it could be logged as a different variation (HKEY_CLASSES_ROOT)
54        TargetObject|contains: '\Everything.'
55    filter_optional_uninstallers:
56        # This image path is linked with different uninstallers when running as admin unfortunately
57        Image|startswith: 'C:\Windows\Installer\MSI'
58    filter_optional_java:
59        Image|startswith: 'C:\Program Files (x86)\Java\'
60        Image|endswith: '\installer.exe'
61        TargetObject|contains: '\Classes\WOW6432Node\CLSID\{4299124F-F2C3-41b4-9C73-9236B2AD0E8F}'
62    filter_optional_edgeupdate:
63        Image|contains: '\Microsoft\EdgeUpdate\Install'
64    filter_optional_avira:
65        Image:
66            - 'C:\Program Files (x86)\Avira\Antivirus\'
67            - 'C:\Program Files\Avira\Antivirus\'
68        TargetObject|endswith:
69            - '\CLSID\{305CA226-D286-468e-B848-2B2E8E697B74}\Shell\Open\Command'
70            - '\AntiVir.Keyfile\shell\open\command'
71    filter_optional_installer_temp:
72        - Image|contains|all:
73              - 'AppData\Local\Temp'
74              - '\setup.exe'
75        - Image|contains|all:
76              - '\Temp\is-'
77              - '\target.tmp'
78    filter_optional_ninite:
79        Image|endswith: '\ninite.exe'
80    filter_optional_discord:
81        Image|endswith: '\reg.exe'
82        TargetObject|endswith: '\Discord\shell\open\command'
83    filter_optional_spotify:
84        Image|endswith: '\Spotify.exe'
85        TargetObject|endswith: '\Spotify\shell\open\command'
86    filter_optional_eclipse:
87        Image|endswith: 'C:\eclipse\eclipse.exe'
88        TargetObject|contains: '_Classes\eclipse+'
89    filter_optional_teamviewer:
90        Image|contains|all:
91            - '\Temp'
92            - '\TeamViewer'
93    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
94falsepositives:
95    - Legitimate software (un)installations are known to cause false positives. Please add them as a filter when encountered
96level: medium