Potential Regsvr32 Commandline Flag Anomaly

 1title: Potential Regsvr32 Commandline Flag Anomaly
 2id: b236190c-1c61-41e9-84b3-3fe03f6d76b0
 3status: test
 4description: Detects a potential command line flag anomaly related to "regsvr32" in which the "/i" flag is used without the "/n" which should be uncommon.
 5references:
 6    - https://twitter.com/sbousseaden/status/1282441816986484737?s=12
 7author: Florian Roth (Nextron Systems)
 8date: 2019-07-13
 9modified: 2024-03-13
10tags:
11    - attack.defense-evasion
12    - attack.t1218.010
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    selection:
18        Image|endswith: '\regsvr32.exe'
19        CommandLine|contains|windash: ' -i:'
20    filter_main_flag:
21        CommandLine|contains|windash: ' -n '
22    condition: selection and not 1 of filter_main_*
23falsepositives:
24    - Administrator typo might cause some false positives
25level: medium