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Lou Stella
2022-01-11 16:44:49 -06:00
parent e7f1eff711
commit 14461f46ff
1 changed files with 1 additions and 1 deletions
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detections/endpoint/ssa___anomalous_usage_of_account_credentials.yml
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@@ -7,7 +7,7 @@ type: Anomaly
datamodel:
- Authentication
description: This is an anomaly generating detection looking for multiple interactive logins within a specific time period. An insider threat may attempt to steal colleagues credentials in low tech, undetectable methods, in order to gain access to additional information or to hide their own behavior. This should capture their attempted use of those credentials on a workstation.
search: '| from read_ssa_enriched_events() | eval device=ucast(map_get(input_event, "dest_device_id"), "string", null), auth_type=ucast(map_get(input_event, "authentication_type"), "string", null), timestamp=parse_long(ucast(map_get(input_event, "_time"), "string", null)), src_user=ucast(map_get(input_event, "endpoint_user_windows_account_names"), "string", null), reason=ucast(map_get(input_event, "reason"), "string", null) | where auth_type="2" OR auth_type="11" | where reason = "success" | where src_user NOT in("DWM-*", "SYSTEM", "ANONYMOUS LOGON") | stats estdc(src_user) AS user_counter by device, span(timestamp, 1200s, 300s) | where user_counter>=2 | rename window_end AS timestamp | eval start_time=window_start, end_time=timestamp, entities=mvappend(device), body=create_map(["user_counter", user_counter, "device", device]) | into write_ssa_detected_events();'
search: '| from read_ssa_enriched_events() | eval device=ucast(map_get(input_event, "dest_device_id"), "string", null), auth_type=ucast(map_get(input_event, "authentication_type"), "integer", null), timestamp=parse_long(ucast(map_get(input_event, "_time"), "string", null)), src_user=ucast(map_get(input_event, "dest_user_original_artifact"), "string", null), reason=ucast(map_get(input_event, "reason"), "string", null) | where auth_type=2 OR auth_type=11 | where reason = "success" | where src_user NOT in("DWM-*", "SYSTEM", "ANONYMOUS LOGON") | stats estdc(src_user) AS user_counter by device, span(timestamp, 300s, 300s) | where user_counter>=2 | rename window_end AS timestamp | eval start_time=window_start, end_time=timestamp, entities=mvappend(device), body=create_map(["user_counter", user_counter, "device", device]) | into write_ssa_detected_events();'
how_to_implement: To successfully implement this detection, you need to be ingesting logon events from workstations.
known_false_positives: Shared workstations can cause false positives
references: