{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/windows-firewall/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Windows"],"_cs_severities":["medium"],"_cs_tags":["uac-bypass","privilege-escalation","windows-firewall","mmc"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eThis threat involves the exploitation of a User Account Control (UAC) bypass technique on Windows systems. Attackers leverage the Microsoft Management Console (MMC) and its Windows Firewall snap-in (WF.msc) to execute arbitrary code with elevated privileges. By hijacking this trusted process, malicious actors can circumvent security measures designed to restrict unauthorized access and modifications to the system. This UAC bypass method allows attackers to stealthily execute code, potentially leading to privilege escalation, malware installation, or data exfiltration. The technique is relevant to defenders because it enables attackers to bypass standard security controls, increasing the risk of successful compromise. This activity has been observed in various forms and can be adapted to deliver a range of malicious payloads.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eUser executes a seemingly benign application or script.\u003c/li\u003e\n\u003cli\u003eThe application triggers the execution of \u003ccode\u003emmc.exe\u003c/code\u003e with the \u003ccode\u003eWF.msc\u003c/code\u003e argument, launching the Windows Firewall snap-in.\u003c/li\u003e\n\u003cli\u003eA malicious process is spawned as a child process of \u003ccode\u003emmc.exe\u003c/code\u003e. This is the key indicator of compromise.\u003c/li\u003e\n\u003cli\u003eThe malicious process exploits a vulnerability or misconfiguration within the MMC snap-in or related components.\u003c/li\u003e\n\u003cli\u003eThe exploited process gains elevated privileges, bypassing UAC restrictions.\u003c/li\u003e\n\u003cli\u003eThe attacker uses these elevated privileges to perform malicious actions, such as installing malware or modifying system settings.\u003c/li\u003e\n\u003cli\u003eThe attacker achieves persistence through registry modifications or scheduled tasks.\u003c/li\u003e\n\u003cli\u003eThe final objective is achieved, such as data exfiltration, system compromise, or lateral movement within the network.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eA successful UAC bypass can lead to a significant compromise of the targeted system. Attackers can install persistent backdoors, escalate privileges, and gain control over critical system functions. This can result in data theft, system instability, or complete system takeover. The impact is amplified in environments where UAC is relied upon as a primary security control, potentially affecting a large number of systems across an organization.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;UAC Bypass via Windows Firewall MMC Snap-In Hijack\u0026rdquo; to your SIEM to detect suspicious processes spawned by \u003ccode\u003emmc.exe\u003c/code\u003e with the \u0026ldquo;WF.msc\u0026rdquo; argument.\u003c/li\u003e\n\u003cli\u003eMonitor process creation events for unexpected child processes of \u003ccode\u003emmc.exe\u003c/code\u003e using process monitoring tools and tune the Sigma rule accordingly.\u003c/li\u003e\n\u003cli\u003eEnable process auditing and Sysmon event logging (Event ID 1) to capture detailed information about process creations, as specified in the setup instructions of the original rule.\u003c/li\u003e\n\u003cli\u003eInvestigate any alerts generated by the Sigma rule, focusing on the parent process chain and the actions performed by the spawned process.\u003c/li\u003e\n\u003cli\u003eRefer to the references provided for more information on UAC bypass techniques and mitigation strategies.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-24T10:00:00Z","date_published":"2024-01-24T10:00:00Z","id":"/briefs/2024-01-uac-bypass-winfw-mmc/","summary":"Attackers bypass User Account Control (UAC) by hijacking the Microsoft Management Console (MMC) Windows Firewall snap-in to execute code with elevated permissions, potentially leading to system compromise.","title":"UAC Bypass via Windows Firewall MMC Snap-In Hijack","url":"https://feed.craftedsignal.io/briefs/2024-01-uac-bypass-winfw-mmc/"}],"language":"en","title":"CraftedSignal Threat Feed — Windows-Firewall","version":"https://jsonfeed.org/version/1.1"}