{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/taskkill/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Splunk Enterprise","Splunk Enterprise Security","Splunk Cloud"],"_cs_severities":["high"],"_cs_tags":["defense-evasion","endpoint","taskkill"],"_cs_type":"advisory","_cs_vendors":["Splunk"],"content_html":"\u003cp\u003eThis analytic focuses on detecting the use of \u003ccode\u003etaskkill.exe\u003c/code\u003e to forcibly terminate processes on Windows systems. Attackers commonly use this technique to disable security tools, disrupt legitimate applications, and evade detection. The detection leverages endpoint detection and response (EDR) agents to monitor command-line executions of \u003ccode\u003etaskkill.exe\u003c/code\u003e with specific parameters, such as \u003ccode\u003e/f\u003c/code\u003e (force), \u003ccode\u003e/t\u003c/code\u003e (terminate child processes), \u003ccode\u003e/im\u003c/code\u003e (image name), and \u003ccode\u003e/pid\u003c/code\u003e (process ID). Identifying this activity is crucial for defenders because successful termination of security processes can allow attackers to operate undetected, maintain persistence, and escalate their privileges within the compromised environment. This technique has been observed in malware operations, including those associated with remote access trojans (RATs) like NjRAT.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eInitial access is gained through an exploit or social engineering.\u003c/li\u003e\n\u003cli\u003eThe attacker executes \u003ccode\u003etaskkill.exe\u003c/code\u003e with the \u003ccode\u003e/im\u003c/code\u003e parameter followed by the image name of a security tool (e.g., \u003ccode\u003etaskkill /im av.exe /f\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eAlternatively, the attacker uses the \u003ccode\u003e/pid\u003c/code\u003e parameter to terminate a specific process by its process ID (e.g., \u003ccode\u003etaskkill /pid 1234 /f\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003e/f\u003c/code\u003e parameter forces the termination of the targeted process, bypassing normal termination procedures.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003e/t\u003c/code\u003e parameter is used to terminate any child processes associated with the targeted process, ensuring complete removal (e.g., \u003ccode\u003etaskkill /im process.exe /t /f\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eSuccessful termination of security tools allows the attacker to evade detection.\u003c/li\u003e\n\u003cli\u003eThe attacker can then execute malicious payloads or perform lateral movement without interference from security software.\u003c/li\u003e\n\u003cli\u003eThe final objective is to exfiltrate data, deploy ransomware, or achieve other malicious goals.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful use of \u003ccode\u003etaskkill.exe\u003c/code\u003e to disable or disrupt security tools can severely compromise a system\u0026rsquo;s defenses. This can lead to extended periods of undetected malicious activity, resulting in data theft, system instability, or complete system compromise. Specific impacts may include data breaches, financial loss, and reputational damage. This technique is often a precursor to more serious attacks like ransomware deployment, with potential widespread damage across the targeted organization.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEnable Sysmon Event ID 1 and Windows Event Log Security 4688 logging to capture process creation events with command-line arguments for \u003ccode\u003etaskkill.exe\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules provided to your SIEM to detect suspicious use of \u003ccode\u003etaskkill.exe\u003c/code\u003e, focusing on processes being terminated and the users initiating the termination.\u003c/li\u003e\n\u003cli\u003eInvestigate any alerts generated by the Sigma rules, focusing on the parent processes of \u003ccode\u003etaskkill.exe\u003c/code\u003e and the processes being terminated.\u003c/li\u003e\n\u003cli\u003eTune the Sigma rules based on your environment to reduce false positives from legitimate administrative activity, as identified in the \u0026lsquo;known_false_positives\u0026rsquo; section.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to limit the potential impact of a successful attack, mitigating lateral movement post-compromise.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-02T12:00:00Z","date_published":"2024-01-02T12:00:00Z","id":"/briefs/2024-01-02-taskkill-defense-evasion/","summary":"The analytic identifies the use of taskkill.exe to forcibly terminate processes, focusing on command-line executions that include specific taskkill parameters, which can indicate attempts to disable security tools or disrupt legitimate applications.","title":"Windows Taskkill Used for Defense Evasion","url":"https://feed.craftedsignal.io/briefs/2024-01-02-taskkill-defense-evasion/"}],"language":"en","title":"CraftedSignal Threat Feed — Taskkill","version":"https://jsonfeed.org/version/1.1"}