Name:Windows Uncommon Remote Thread Creation In Browser Process id:634cce27-a3a6-4079-b0d6-3ced361a0aa9 version:1 date:None author:Teoderick Contreras, Nasreddine Bencherchali, Splunk status:production type:Anomaly Description:The following analytic identifies the creation of a remote thread by a process such as wermgr.exe or rundll32.exe into a browser process such as firefox.exe, chrome.exe, and others.
These processes do not typically create remote threads, in browser processes.
It leverages Sysmon EventID 8 to detect this behavior by monitoring SourceImage and TargetImage fields.
This activity is significant because it is commonly associated with malware like Qakbot and IcedID, which injects malicious code into legitimate processes to steal information.
If confirmed malicious, this activity could allow attackers to execute arbitrary code, escalate privileges, and exfiltrate sensitive data from the compromised host. Data_source:
how_to_implement:To successfully implement this search, you need to be ingesting logs with the SourceImage, TargetImage, and EventCode executions from your endpoints related to create remote thread or injecting codes. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA. known_false_positives:No false positives have been identified at this time. References: -https://news.sophos.com/en-us/2022/03/10/qakbot-decoded/ -https://www.trellix.com/en-us/about/newsroom/stories/research/demystifying-qbot-malware.html -https://www.joesandbox.com/analysis/380662/0/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 ("$dest$") | 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:'7d' latest_offset:'0' analytic_story:['Qakbot', 'IcedID', 'Living Off The Land']
