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BIOC-suspicious-command-line-.md

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  • rule_id: 402
  • global_rule_id: NO_ID
  • mssp_global_rule_id: None
  • insert_time: 1699031533674
  • modify_time: 1699031533674
  • severity: SEV_030_MEDIUM
  • source: frank.bussink@swissexpertgroup.com
  • comment:
  • status: ENABLED
  • category: CREDENTIAL_ACCESS
  • indicator: None
  • indicator_md5: 11dc07e8da51f64c7d0581cc08c7d588
  • indicator_text: dataset = xdr_data

| filter event_type = ENUM.PROCESS

| filter causality_actor_process_signature_vendor CONTAINS "microsoft" // Only keep cmd.exe or powershell etc...

| alter cmd= action_process_image_command_line // use small length var name

| filter cmd CONTAINS "C:\Windows\NTDS\ntds.dit" or cmd CONTAINS "C:\Windows\System32\config\SYSTEM" or cmd CONTAINS "C:\Windows\System32\config\SAM"

  • name: XQL-suspicious-command-line to Critical registry and NTDS file
  • mitre_technique_id_and_name: T1003 - OS Credential Dumping
  • mitre_tactic_id_and_name: TA0006 - Credential Access
  • mitre_tactic_id: TA0006
  • mitre_technique_id: T1003
  • btp_rule: None
  • btp_rule_name: None
  • is_preventable: 0
  • supported_os: None
  • btp_validation_error: None
  • xql: {"stages":[{"FILTER":{"filter":{"OR":[{"LEFT":"$event_type","OPERATOR":"EQ","RIGHT":"$ENUM.PROCESS","FILTER_DIALECT":"EXTENDED_FILTER_OBJ"}]}}},{"FILTER":{"filter":{"OR":[{"LEFT":"$causality_actor_process_signature_vendor","OPERATOR":"CONTAINS","RIGHT":"microsoft","FILTER_DIALECT":"EXTENDED_FILTER_OBJ"}]}}},{"ADD_FIELDS":{"fields":[{"name":"cmd","source":"$action_process_image_command_line"}]}},{"FILTER":{"filter":{"OR":[{"OR":[{"LEFT":"$cmd","OPERATOR":"CONTAINS","RIGHT":"C:\Windows\NTDS\ntds.dit","FILTER_DIALECT":"EXTENDED_FILTER_OBJ"},{"LEFT":"$cmd","OPERATOR":"CONTAINS","RIGHT":"C:\Windows\System32\config\SYSTEM","FILTER_DIALECT":"EXTENDED_FILTER_OBJ"}]},{"LEFT":"$cmd","OPERATOR":"CONTAINS","RIGHT":"C:\Windows\System32\config\SAM","FILTER_DIALECT":"EXTENDED_FILTER_OBJ"}]}}}],"original_query":null,"tables":["xdr_data"]}
  • is_xql: True
  • query_tables: ["xdr_data"]
  • rule_indicator_last_modified_ts: 1699031533674
  • status_changed_by: None
  • status_changed_at: None
  • last_status_change_reason: None