diff --git a/rules/windows/builtin/security/win_security_new_or_renamed_user_account_with_dollar_sign.yml b/rules/windows/builtin/security/win_security_new_or_renamed_user_account_with_dollar_sign.yml index 442b67b4a..2cb0b5bbe 100644 --- a/rules/windows/builtin/security/win_security_new_or_renamed_user_account_with_dollar_sign.yml +++ b/rules/windows/builtin/security/win_security_new_or_renamed_user_account_with_dollar_sign.yml @@ -4,7 +4,7 @@ status: test description: Detects possible bypass EDR and SIEM via abnormal user account name. author: Ilyas Ochkov, oscd.community date: 2019/10/25 -modified: 2022/10/09 +modified: 2022/11/22 tags: - attack.defense_evasion - attack.t1036 @@ -12,16 +12,18 @@ logsource: product: windows service: security detection: - selection: - EventID: - - 4720 # create user - - 4781 # rename user + selection1: + EventID: 4720 # create user SamAccountName|contains: '$' - condition: selection + selection2: + EventID: 4781 # rename user + NewTargetUserName|contains: '$' + condition: 1 of selection* fields: - EventID - SamAccountName - SubjectUserName + - NewTargetUserName falsepositives: - Unknown level: high