diff --git a/detections/endpoint/creation_of_lsass_dump_with_taskmgr.yml b/detections/endpoint/creation_of_lsass_dump_with_taskmgr.yml new file mode 100644 index 0000000000..c149a63748 --- /dev/null +++ b/detections/endpoint/creation_of_lsass_dump_with_taskmgr.yml @@ -0,0 +1,42 @@ +name: Creation of lsass Dump with Taskmgr +id: b2fbe95a-9c62-4c12-8a29-24b97e84c0cd +version: 1 +date: '2020-02-03' +description: Detect the hands on keyboard behavior of Windows Task Manager creating a prcoess dump of lsass.exe. + Upon this behavior occurring, a file write/modification will occur in the users profile under \AppData\Local\Temp. + The dump file, lsass.dmp, cannot be renamed, however if the dump occurs more than once, it will be named lsass (2).dmp. +how_to_implement: This search requires Sysmon Logs and a Sysmon configuration, which + includes EventCode 11 for detecting file create of lsass.dmp. + 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. +type: ESCU +references: +- https://2017.zeronights.org/wp-content/uploads/materials/ZN17_Kheirkhabarov_Hunting_for_Credentials_Dumping_in_Windows_Environment.pdf +author: Michael Haag, Splunk +search: '`sysmon` EventID=11 process_name=taskmgr.exe TargetFilename=*lsass*.dmp + | stats count min(_time) as firstTime max(_time) as lastTime by Computer, object_category, process_name, TargetFilename + | rename Computer as dest + | `security_content_ctime(firstTime)` + | `security_content_ctime(lastTime)` + | `creation_of_lsass_dump_with_taskmgr_filter`' +known_false_positives: Administrators can create memory dumps for debugging purposes, + but memory dumps of the LSASS process would be unusual. +tags: + analytics_story: + - Credential Dumping + mitre_attack_id: + - T1003.001 + kill_chain_phases: + - Actions on Objectives + cis20: + - CIS 6 + - CIS 8 + nist: + - DE.CM + security_domain: endpoint + asset_type: Windows + dataset: + - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1003.001/atomic_red_team/windows-sysmon.log diff --git a/tests/endpoint/creation_of_lsass_dump_with_taskmgr.test.yml b/tests/endpoint/creation_of_lsass_dump_with_taskmgr.test.yml new file mode 100644 index 0000000000..f01f2a6d7e --- /dev/null +++ b/tests/endpoint/creation_of_lsass_dump_with_taskmgr.test.yml @@ -0,0 +1,12 @@ +name: Creation of lsass dump with taskmgr Unit Test +tests: +- name: Creation of lsass dump with taskmgr + file: endpoint/creation_of_lsass_dump_with_taskmgr.yml + pass_condition: '| stats count | where count > 0' + earliest_time: '-24h' + latest_time: 'now' + attack_data: + - file_name: windows-sysmon.log + data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1003.001/atomic_red_team/windows-sysmon.log + source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational + sourcetype: xmlwineventlog