diff --git a/detections/endpoint/bcdedit_command_back_to_normal_mode_boot.yml b/detections/endpoint/bcdedit_command_back_to_normal_mode_boot.yml index 545daa939f..7373e931ba 100644 --- a/detections/endpoint/bcdedit_command_back_to_normal_mode_boot.yml +++ b/detections/endpoint/bcdedit_command_back_to_normal_mode_boot.yml @@ -6,25 +6,25 @@ author: Teoderick Contreras, Splunk type: TTP datamodel: - Endpoint -description: This search is to detect a suspicious bcdedit commandline to configure the host from safe mode back to normal boot configuration. - This technique was seen in blackMatter ransomware where it force the compromised host to boot in safe mode to continue its encryption and bring back to normal boot using - bcdedit deletevalue command. - This TTP can be a good alert for host that booted from safe mode forcefully since it need to modify the boot configuration to bring it back to normal. +description: This search is to detect a suspicious bcdedit commandline to configure + the host from safe mode back to normal boot configuration. This technique was seen + in blackMatter ransomware where it force the compromised host to boot in safe mode + to continue its encryption and bring back to normal boot using bcdedit deletevalue + command. This TTP can be a good alert for host that booted from safe mode forcefully + since it need to modify the boot configuration to bring it back to normal. search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name = bcdedit.exe - Processes.process="*/deletevalue*" Processes.process="*{current}*" Processes.process="*safeboot*" by Processes.process_name - Processes.process Processes.parent_process_name Processes.dest Processes.user - |`drop_dm_object_name(Processes)` - | `security_content_ctime(firstTime)` - | `security_content_ctime(lastTime)` - | `bcdedit_command_back_to_normal_mode_boot_filter`' + Processes.process="*/deletevalue*" Processes.process="*{current}*" Processes.process="*safeboot*" + by Processes.process_name Processes.process Processes.parent_process_name Processes.dest + Processes.user |`drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` + | `security_content_ctime(lastTime)` | `bcdedit_command_back_to_normal_mode_boot_filter`' how_to_implement: To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA. Tune and filter known instances where renamed rundll32.exe may be used. known_false_positives: unknown references: -- https://news.sophos.com/en-us/2021/08/09/blackmatter-ransomware-emerges-from-the-shadow-of-darkside/ +- https://news.sophos.com/en-us/2021/08/09/blackmatter-ransomware-emerges-from-the-shadow-of-darkside/ tags: analytic_story: - BlackMatter Ransomware @@ -41,20 +41,20 @@ tags: required_fields: - _time - Processes.process_name - - Processes.process + - Processes.process - Processes.parent_process_name - - Processes.parent_process - - Processes.dest - - Processes.user + - Processes.parent_process + - Processes.dest + - Processes.user security_domain: endpoint impact: 50 confidence: 70 - # (impact * confidence)/100 risk_score: 35 context: - - Source:Endpoint - - Stage:Impact - message: bcdedit process with commandline $process$ to bring back to normal boot configuration the $dest$ + - Source:Endpoint + - Stage:Impact + message: bcdedit process with commandline $process$ to bring back to normal boot + configuration the $dest$ observable: - name: user type: User @@ -63,4 +63,5 @@ tags: - name: dest type: Hostname role: - - Victim \ No newline at end of file + - Victim + automated_detection_testing: passed