{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/unlocker/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Unlocker Extension","Splunk Enterprise","Splunk Enterprise Security","Splunk Cloud"],"_cs_severities":["medium"],"_cs_tags":["iobit","unlocker","regsvr32","dll","windows","threat-detection"],"_cs_type":"advisory","_cs_vendors":["IObit","Splunk"],"content_html":"\u003cp\u003eIOBit Unlocker is a legitimate Windows utility designed to resolve issues involving files or folders that cannot be deleted, moved, or renamed because they are locked by other processes or applications. Attackers can abuse this tool by registering a malicious extension DLL that enables them to unlock and manipulate critical system files, potentially leading to privilege escalation, data exfiltration, or system compromise. This technique can be employed to disable security software, modify system configurations, or deploy malware more effectively.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker gains initial access to a compromised system.\u003c/li\u003e\n\u003cli\u003eThe attacker drops a malicious DLL file, disguised as or named similarly to \u0026ldquo;IObitUnlockerExtension.dll\u0026rdquo;, onto the system.\u003c/li\u003e\n\u003cli\u003eThe attacker uses regsvr32.exe to register the malicious DLL: \u003ccode\u003eregsvr32.exe /s IObitUnlockerExtension.dll\u003c/code\u003e. The \u003ccode\u003e/s\u003c/code\u003e flag is used for silent registration to avoid user interaction.\u003c/li\u003e\n\u003cli\u003eUpon successful registration, the DLL is loaded by the system.\u003c/li\u003e\n\u003cli\u003eThe malicious DLL hooks into system processes, granting the attacker the ability to unlock files and folders protected by the operating system or other applications.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the DLL\u0026rsquo;s capabilities to unlock files or folders related to security software, such as antivirus programs, or critical system configurations.\u003c/li\u003e\n\u003cli\u003eThe attacker modifies or replaces these unlocked files to disable security controls, escalate privileges, or plant persistent malware.\u003c/li\u003e\n\u003cli\u003eThe attacker achieves their objective, which may include data exfiltration, system disruption, or deploying ransomware.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation can lead to the complete compromise of a Windows host. An attacker may disable security software, modify sensitive system configurations, and deploy malware undetected. The DFIR Report has observed this technique used in intrusions leading to ransomware deployment.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect IOBit Unlocker Extension DLL Registration via Regsvr32\u003c/code\u003e to your SIEM to identify suspicious registrations of IOBitUnlockerExtension.dll.\u003c/li\u003e\n\u003cli\u003eMonitor process creation events for instances of \u003ccode\u003eregsvr32.exe\u003c/code\u003e registering DLLs from unusual or suspicious locations.\u003c/li\u003e\n\u003cli\u003eImplement application control policies to restrict the execution of \u003ccode\u003eregsvr32.exe\u003c/code\u003e to authorized users and processes.\u003c/li\u003e\n\u003cli\u003eRegularly review and audit registered DLLs to identify any unauthorized or malicious extensions.\u003c/li\u003e\n\u003cli\u003eInvestigate any endpoint activity involving IObit Unlocker, including file modifications and process terminations related to locked files.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T12:00:00Z","date_published":"2024-01-03T12:00:00Z","id":"/briefs/2024-01-iobit-unlocker-extension-dll-registration/","summary":"The IOBit Unlocker Extension DLL is being registered via regsvr32.exe, a Windows utility used to unlock files or folders by terminating locking processes, which could be abused for malicious purposes.","title":"IOBit Unlocker Extension DLL Registration via Regsvr32","url":"https://feed.craftedsignal.io/briefs/2024-01-iobit-unlocker-extension-dll-registration/"}],"language":"en","title":"CraftedSignal Threat Feed — Unlocker","version":"https://jsonfeed.org/version/1.1"}