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Windows Defender disabled by malware
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<blockquote data-quote="Andy Ful" data-source="post: 938187" data-attributes="member: 32260"><p>It will if you are going to do it manually. Such an attack can have most chances when done with a little social engineering when the user manually bypasses UAC prompt. Any malware that can get high privileges can smash your system even without disabling the AV.</p><p>It is harder to do it without user interaction. The attacker has to use in the script the UAC bypass and unpacking command-line. Furthermore, the attack would usually require two executables (Defender Control + unpacker) and a payload. The files have to be delivered, usually from not trusted URL. There are some modifications available. All of this significantly increases the suspiciousness of an attack, so one cannot be sure if it would succeed in the wild in the real-world scenario.</p><p>Similar possibilities were available for years and only rarely used in the wild. This method can be used in the targeted attacks, but not to disable Defender permanently. Disabling Defender temporarily (also due to Defender Tamper Protection) can be used to run exploit kits for lateral movement and hide traces.</p></blockquote><p></p>
[QUOTE="Andy Ful, post: 938187, member: 32260"] It will if you are going to do it manually. Such an attack can have most chances when done with a little social engineering when the user manually bypasses UAC prompt. Any malware that can get high privileges can smash your system even without disabling the AV. It is harder to do it without user interaction. The attacker has to use in the script the UAC bypass and unpacking command-line. Furthermore, the attack would usually require two executables (Defender Control + unpacker) and a payload. The files have to be delivered, usually from not trusted URL. There are some modifications available. All of this significantly increases the suspiciousness of an attack, so one cannot be sure if it would succeed in the wild in the real-world scenario. Similar possibilities were available for years and only rarely used in the wild. This method can be used in the targeted attacks, but not to disable Defender permanently. Disabling Defender temporarily (also due to Defender Tamper Protection) can be used to run exploit kits for lateral movement and hide traces. [/QUOTE]
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