Name:Windows App Layer Protocol Wermgr Connect To NamedPipe id:2f3a4092-548b-421c-9caa-84918e1787ef version:3 date:2024-09-30 author:Teoderick Contreras, Splunk status:production type:Anomaly Description:The following analytic detects the wermgr.exe process creating or connecting to a named pipe. It leverages Sysmon EventCodes 17 and 18 to identify these actions. This activity is significant because wermgr.exe, a legitimate Windows OS Problem Reporting application, is often abused by malware such as Trickbot and Qakbot to execute malicious code. If confirmed malicious, this behavior could indicate that an attacker has injected code into wermgr.exe, potentially allowing them to communicate covertly, escalate privileges, or persist within the environment. Data_source:
-Sysmon EventID 17
-Sysmon EventID 18
search:`sysmon` EventCode IN (17, 18) Image= "*\\wermgr.exe" EventType IN ( "CreatePipe", "ConnectPipe") | stats min(_time) as firstTime max(_time) as lastTime count by Image EventType ProcessGuid ProcessId PipeName SecurityID EventCode dest UserID | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_app_layer_protocol_wermgr_connect_to_namedpipe_filter`
how_to_implement:To successfully implement this search, you need to be ingesting logs with the process name, pipename, processguid and named pipe event type from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA. known_false_positives:unknown References: -https://strontic.github.io/xcyclopedia/library/wermgr.exe-0F652BF7ADA772981E8AAB0D108FCC92.html -https://www.trellix.com/en-us/about/newsroom/stories/research/demystifying-qbot-malware.html drilldown_searches: name:'View the detection results for - "$dest$"' search:'%original_detection_search% | search dest = "$dest$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") 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: - 'Qakbot' asset_type:Endpoint confidence:70 impact:70 message:wermgr.exe process is creating or connecting to a named pipe $PipeName$ in $dest$ mitre_attack_id: - 'T1071' observable: name:'dest' type:'Endpoint' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'Image' - 'EventType' - 'ProcessGuid' - 'ProcessId' - 'PipeName' - 'dest' - 'UserID' - 'SecurityID' risk_score:49 security_domain:endpoint
