Potential Regsvr32 Commandline Flag Anomaly

testmedium
log source: windows · process_creationauthor Florian Roth (Nextron Systems)date 2019-07-13
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description

What this is, in brief.

Detects a potential command line flag anomaly related to "regsvr32" in which the "/i" flag is used without the "/n" which should be uncommon.

02

tags

attack.stealthattack.t1218.010
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rule source (YAML)

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

ATT&CK techniques this enables or maps to.

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references

External citations — patches, advisories, analysis.