Name:Detect Credential Dumping through LSASS access id:2c365e57-4414-4540-8dc0-73ab10729996 version:5 date:2024-09-30 author:Patrick Bareiss, Splunk status:production type:TTP Description:The following analytic detects attempts to read LSASS memory, indicative of credential dumping. It leverages Sysmon EventCode 10, filtering for specific access permissions (0x1010 and 0x1410) on the lsass.exe process. This activity is significant because it suggests an attacker is trying to extract credentials from LSASS memory, potentially leading to unauthorized access, data breaches, and compromise of sensitive information. If confirmed malicious, this could enable attackers to escalate privileges, move laterally within the network, or exfiltrate data. Extensive triage is necessary to differentiate between malicious and benign activities. Data_source:
-Sysmon EventID 10
search:`sysmon` EventCode=10 TargetImage=*lsass.exe (GrantedAccess=0x1010 OR GrantedAccess=0x1410) | stats count min(_time) as firstTime max(_time) as lastTime by dest, SourceImage, SourceProcessId, TargetImage, TargetProcessId, EventCode, GrantedAccess | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)` | `detect_credential_dumping_through_lsass_access_filter`
how_to_implement:This search needs Sysmon Logs and a sysmon configuration, which includes EventCode 10 with lsass.exe. This search uses an input macro named `sysmon`. We strongly recommend that you specify your environment-specific configurations (index, source, sourcetype, etc.) for Windows Sysmon logs. Replace the macro definition with configurations for your Splunk environment. The search also uses a post-filter macro designed to filter out known false positives. known_false_positives:The activity may be legitimate. Other tools can access lsass for legitimate reasons, and it's possible this event could be generated in those cases. In these cases, false positives should be fairly obvious and you may need to tweak the search to eliminate noise. References: drilldown_searches: name:'View the detection results for - "$dest$" and "$TargetImage$"' search:'%original_detection_search% | search dest = "$dest$" TargetImage = "$TargetImage$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest$" and "$TargetImage$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$", "$TargetImage$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'Detect Zerologon Attack' - 'CISA AA23-347A' - 'Credential Dumping' - 'BlackSuit Ransomware' asset_type:Windows confidence:100 impact:80 message:The $SourceImage$ has attempted access to read $TargetImage$ was identified on endpoint $dest$, this is indicative of credential dumping and should be investigated. mitre_attack_id: - 'T1003.001' - 'T1003' observable: name:'dest' type:'Hostname' - role: - 'Victim' name:'TargetImage' type:'Other' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'EventCode' - 'TargetImage' - 'GrantedAccess' - 'dest' - 'SourceImage' - 'SourceProcessId' - 'TargetImage' - 'TargetProcessId' risk_score:80 security_domain:endpoint
