Detectionmediumtest
New or Renamed User Account with '$' Character
Detects the creation of a user with the "$" character. This can be used by attackers to hide a user or trick detection systems that lack the parsing mechanisms.
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Ilyas Ochkov, oscd.communityCreated Fri Oct 25Updated Tue Jan 16cfeed607-6aa4-4bbd-9627-b637deb723c8windows
Log Source
Windowssecurity
ProductWindows← raw: windows
Servicesecurity← raw: security
Detection Logic
Detection Logic3 selectors
detection:
selection_create:
EventID: 4720 # create user
SamAccountName|contains: '$'
selection_rename:
EventID: 4781 # rename user
NewTargetUserName|contains: '$'
filter_main_homegroup:
EventID: 4720
TargetUserName: 'HomeGroupUser$'
condition: 1 of selection_* and not 1 of filter_main_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Tactics
Techniques
Rule Metadata
Rule ID
cfeed607-6aa4-4bbd-9627-b637deb723c8
Status
test
Level
medium
Type
Detection
Created
Fri Oct 25
Modified
Tue Jan 16
Author
Path
rules/windows/builtin/security/win_security_new_or_renamed_user_account_with_dollar_sign.yml
Raw Tags
attack.defense-evasionattack.t1036