{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/process-tree/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Windows"],"_cs_severities":["medium"],"_cs_tags":["execution","windows","process-tree"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eThis detection identifies a suspicious parent-child process relationship involving \u003ccode\u003ecmd.exe\u003c/code\u003e being launched by an unusual parent process on Windows systems. Adversaries often exploit \u003ccode\u003ecmd.exe\u003c/code\u003e to execute malicious commands stealthily.  This rule flags instances of \u003ccode\u003ecmd.exe\u003c/code\u003e spawned by uncommon parent processes, indicating unauthorized or suspicious activity. The rule focuses on identifying deviations from normal process execution patterns by monitoring process ancestry, specifically looking for \u003ccode\u003ecmd.exe\u003c/code\u003e instances with parent processes that are not typically associated with command-line execution. This allows for early threat detection.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn adversary gains initial access to a Windows system (e.g., via phishing or exploiting a vulnerability).\u003c/li\u003e\n\u003cli\u003eThe adversary executes a malicious payload, potentially dropped onto the system or directly executed in memory.\u003c/li\u003e\n\u003cli\u003eThis payload, masquerading as or using a legitimate process (e.g., \u003ccode\u003ewermgr.exe\u003c/code\u003e or \u003ccode\u003eSearchIndexer.exe\u003c/code\u003e), spawns a new \u003ccode\u003ecmd.exe\u003c/code\u003e process.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003ecmd.exe\u003c/code\u003e executes commands provided by the initial malicious process, such as downloading additional tools or modifying system configurations.\u003c/li\u003e\n\u003cli\u003eThe adversary uses these commands to escalate privileges or move laterally within the network.\u003c/li\u003e\n\u003cli\u003eData exfiltration may occur through the command shell, piping output to network utilities.\u003c/li\u003e\n\u003cli\u003ePersistence mechanisms are established via registry modifications or scheduled tasks, again using \u003ccode\u003ecmd.exe\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe ultimate objective is achieved, such as data theft, system disruption, or ransomware deployment.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation could lead to unauthorized access, privilege escalation, and execution of arbitrary commands on the compromised system. This can result in data breaches, system instability, and potential lateral movement within the network. The impact ranges from minor disruptions to severe data loss and operational downtime, depending on the attacker's objectives and the level of access gained. The rule helps defenders quickly spot unusual cmd.exe execution and shut down command execution.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eUnusual Cmd.exe Parent Process\u003c/code\u003e to your SIEM to detect anomalous process relationships (process_creation).\u003c/li\u003e\n\u003cli\u003eInvestigate any alerts triggered by the Sigma rule by examining the parent process's command-line arguments and network activity.\u003c/li\u003e\n\u003cli\u003eImplement enhanced monitoring for \u003ccode\u003ecmd.exe\u003c/code\u003e and its parent processes to proactively identify similar anomalies in the future (Sysmon).\u003c/li\u003e\n\u003cli\u003eCreate exceptions for legitimate processes spawning \u003ccode\u003ecmd.exe\u003c/code\u003e as identified in the rule's false positive analysis, such as \u003ccode\u003eSearchIndexer.exe\u003c/code\u003e or \u003ccode\u003etaskhostw.exe\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eConsider enabling process command line auditing to enhance visibility into the commands being executed by \u003ccode\u003ecmd.exe\u003c/code\u003e (Sysmon).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-02T12:00:00Z","date_published":"2024-01-02T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-unusual-cmd-parent/","summary":"Atypical parent processes spawning cmd.exe indicate potential malicious command execution on Windows systems, where adversaries leverage cmd.exe from unusual parent processes to execute malicious commands stealthily.","title":"Unusual Parent Process for cmd.exe","url":"https://feed.craftedsignal.io/briefs/2024-01-unusual-cmd-parent/"}],"language":"en","title":"CraftedSignal Threat Feed - Process-Tree","version":"https://jsonfeed.org/version/1.1"}