Suspicious DLL Loaded via CertOC.EXE
Detects when a user installs certificates by using CertOC.exe to load the target DLL file.
Sigma rule (View on GitHub)
1title: Suspicious DLL Loaded via CertOC.EXE
2id: 84232095-ecca-4015-b0d7-7726507ee793
3related:
4 - id: 242301bc-f92f-4476-8718-78004a6efd9f
5 type: similar
6status: test
7description: Detects when a user installs certificates by using CertOC.exe to load the target DLL file.
8references:
9 - https://twitter.com/sblmsrsn/status/1445758411803480072?s=20
10 - https://github.com/elastic/protections-artifacts/commit/746086721fd385d9f5c6647cada1788db4aea95f#diff-fe98e74189873d6df72a15df2eaa0315c59ba9cdaca93ecd68afc4ea09194ef2
11 - https://lolbas-project.github.io/lolbas/Binaries/Certoc/
12author: Nasreddine Bencherchali (Nextron Systems)
13date: 2023-02-15
14modified: 2024-03-05
15tags:
16 - attack.defense-evasion
17 - attack.t1218
18logsource:
19 category: process_creation
20 product: windows
21detection:
22 selection_img:
23 - Image|endswith: '\certoc.exe'
24 - OriginalFileName: 'CertOC.exe'
25 selection_cli:
26 CommandLine|contains|windash: ' -LoadDLL '
27 selection_paths:
28 CommandLine|contains:
29 - '\Appdata\Local\Temp\'
30 - '\Desktop\'
31 - '\Downloads\'
32 - '\Users\Public\'
33 - 'C:\Windows\Tasks\'
34 - 'C:\Windows\Temp\'
35 condition: all of selection_*
36falsepositives:
37 - Unknown
38level: high
References
-
Elastic Security detection content for Endpoint. Contribute to elastic/protections-artifacts development by creating an account on GitHub.
Read More -
CertOC.exe is a living-of-the-land file containing unexpected functionality that can be abused by attackers; this page lists all its use cases.
Read More
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