Emerging Threathightest
Suspicious Computer Account Name Change CVE-2021-42287
Detects the renaming of an existing computer account to a account name that doesn't contain a $ symbol as seen in attacks against CVE-2021-42287
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Launch
Florian Roth (Nextron Systems)Created Wed Dec 22Updated Sun Dec 2545eb2ae2-9aa2-4c3a-99a5-6e50776554662021
Emerging Threat
Active Threat
Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.
Log Source
Windowssecurity
ProductWindows← raw: windows
Servicesecurity← raw: security
Detection Logic
Detection Logic2 selectors
detection:
selection:
EventID: 4781 # rename user
OldTargetUserName|contains: '$'
filter:
NewTargetUserName|contains: '$'
condition: selection and not filterFalse Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Other
cve.2021-42287detection.emerging-threats
Rule Metadata
Rule ID
45eb2ae2-9aa2-4c3a-99a5-6e5077655466
Status
test
Level
high
Type
Emerging Threat
Created
Wed Dec 22
Modified
Sun Dec 25
Path
rules-emerging-threats/2021/Exploits/CVE-2021-42287/win_security_samaccountname_spoofing_cve_2021_42287.yml
Raw Tags
attack.privilege-escalationattack.defense-evasionattack.persistenceattack.t1036attack.t1098cve.2021-42287detection.emerging-threats