Name:Windows Unsigned DLL Side-Loading In Same Process Path id:3cf85c02-f9d6-4186-bf3c-e70ee99fbc7f version:2 date:2024-09-30 author:Teoderick Contreras, Splunk status:production type:TTP Description:This detection identifies unsigned DLLs loaded through DLL side-loading with same file path with the process loaded the DLL, a technique observed in DarkGate malware. This detection monitors DLL loading, verifies signatures, and flags unsigned DLLs. Suspicious file paths and known executable associations are checked. Detecting such suspicious DLLs is crucial in preventing privilege escalation attacks and other potential security breaches. Regular security assessments, thorough monitoring, and implementing security best practices are essential in safeguarding systems from such threats. Data_source:
-Sysmon EventID 7
search:`sysmon` EventCode=7 Signed=false SignatureStatus != Valid NOT (Image IN ("*:\\windows\\system32\\*", "*:\\windows\\syswow64\\*", "c:\\Program Files*")) NOT (ImageLoaded IN ("*:\\windows\\system32\\*", "*:\\windows\\syswow64\\*", "c:\\Program Files*")) | rex field=Image "(?<ImageFolderPath>.+\\\)" | rex field=ImageLoaded "(?<ImageLoadedFolderPath>.+\\\)" | where ImageFolderPath = ImageLoadedFolderPath | stats count min(_time) as firstTime max(_time) as lastTime by Image ProcessGuid ImageLoaded user Computer EventCode ImageFolderPath ImageLoadedFolderPath Company Description Product Signed SignatureStatus | rename Computer as dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_unsigned_dll_side_loading_in_same_process_path_filter`
how_to_implement:To successfully implement this search, you need to be ingesting logs with the process name and imageloaded executions 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://www.splunk.com/en_us/blog/security/enter-the-gates-an-analysis-of-the-darkgate-autoit-loader.html -https://www.trendmicro.com/en_us/research/23/b/investigating-the-plugx-trojan-disguised-as-a-legitimate-windows.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: - 'DarkGate Malware' - 'PlugX' asset_type:Endpoint confidence:70 impact:70 message:An unsigned dll module was loaded on $dest$ mitre_attack_id: - 'T1574.002' - 'T1574' observable: name:'dest' type:'Endpoint' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' risk_score:49 required_fields: - '_time' - 'Image' - 'ImageLoaded' - 'Signed' - 'SignatureStatus' - 'OriginalFileName' - 'process_name' - 'dest' - 'EventCode' - 'ProcessId' - 'Hashes' - 'IMPHASH' security_domain:endpoint
