Security Software Discovery Via Powershell Script
Detects calls to "get-process" where the output is piped to a "where-object" filter to search for security solution processes. Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment. This may include things such as firewall rules and anti-virus
Sigma rule (View on GitHub)
1title: Security Software Discovery Via Powershell Script
2id: 904e8e61-8edf-4350-b59c-b905fc8e810c
3status: test
4description: |
5 Detects calls to "get-process" where the output is piped to a "where-object" filter to search for security solution processes.
6 Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment. This may include things such as firewall rules and anti-virus
7references:
8 - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1518.001/T1518.001.md#atomic-test-2---security-software-discovery---powershell
9author: frack113, Anish Bogati, Nasreddine Bencherchali (Nextron Systems)
10date: 2021-12-16
11modified: 2023-10-24
12tags:
13 - attack.discovery
14 - attack.t1518.001
15logsource:
16 product: windows
17 category: ps_script
18 definition: 'Requirements: Script Block Logging must be enabled'
19detection:
20 selection_cmdlet:
21 ScriptBlockText|contains:
22 - 'get-process | \?'
23 - 'get-process | where'
24 - 'gps | \?'
25 - 'gps | where'
26 selection_field:
27 ScriptBlockText|contains:
28 - 'Company -like'
29 - 'Description -like'
30 - 'Name -like'
31 - 'Path -like'
32 - 'Product -like'
33 selection_keywords:
34 ScriptBlockText|contains:
35 # Note: These strings are using wildcard assuming the search is using the "-like" operator.
36 # You can add specific variant with the actual process names to increase coverage
37 - '\*avira\*'
38 - '\*carbonblack\*'
39 - '\*cylance\*'
40 - '\*defender\*'
41 - '\*kaspersky\*'
42 - '\*malware\*'
43 - '\*sentinel\*'
44 - '\*symantec\*'
45 - '\*virus\*'
46 condition: all of selection_*
47falsepositives:
48 - False positives might occur due to the nature of the ScriptBlock being ingested as a big blob. Initial tuning is required.
49 - As the "selection_cmdlet" is common in scripts the matching engine might slow down the search. Change into regex or a more accurate string to avoid heavy resource consumption if experienced
50level: medium
References
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