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<blockquote data-quote="Rijndael" data-source="post: 839994" data-attributes="member: 83138"><p>Exactly! There are even ways, by design, to bypass AppLocker (with macros and by calling certain WinApi functions with specific parameters. A hotfix exists, but you have to install it manually :emoji_sob<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite109" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />.</p><p></p><p></p><p></p><p></p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite126" alt=":ROFLMAO:" title="ROFL :ROFLMAO:" loading="lazy" data-shortname=":ROFLMAO:" /><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite126" alt=":ROFLMAO:" title="ROFL :ROFLMAO:" loading="lazy" data-shortname=":ROFLMAO:" /></p><p>A very funny simile and it is true in most simple infections but disabling the antivirus can be interesting from the point of view of a malware writer. Almost automatically I came up with the following example:</p><p></p><p><strong>Malware Design</strong></p><p></p><p><u>Downloader.exe</u></p><p>Size 10-30 kb</p><p>Functions: Download File, Save File on disk, Run File, Disable WD (Registry access)</p><p>It does not call Windows API functions that can trigger WD radars</p><p>The odds of being detected as malware are low</p><p>Only detectable using file reputation services</p><p></p><p><u>Malware.exe</u></p><p>Size 50+ kb</p><p>Lots of malware related Windows API calls - Malicious Behavior</p><p>High odds of being detected by ML, heuristics...</p><p></p><p></p><p><strong>Attack scheme</strong></p><p></p><p><u>Downloader</u> -> Disable WD -> Download Malware.exe -> Run Malware.exe</p><p>WD will never see <u>Malware,exe</u></p><p></p><p></p><p>Disabling WD before the malware infects the PC also prevents malicious code from being sent to analysis systems in the WD Cloud.</p></blockquote><p></p>
[QUOTE="Rijndael, post: 839994, member: 83138"] Exactly! There are even ways, by design, to bypass AppLocker (with macros and by calling certain WinApi functions with specific parameters. A hotfix exists, but you have to install it manually :emoji_sob:). :ROFLMAO::ROFLMAO: A very funny simile and it is true in most simple infections but disabling the antivirus can be interesting from the point of view of a malware writer. Almost automatically I came up with the following example: [B]Malware Design[/B] [U]Downloader.exe[/U] Size 10-30 kb Functions: Download File, Save File on disk, Run File, Disable WD (Registry access) It does not call Windows API functions that can trigger WD radars The odds of being detected as malware are low Only detectable using file reputation services [U]Malware.exe[/U] Size 50+ kb Lots of malware related Windows API calls - Malicious Behavior High odds of being detected by ML, heuristics... [B]Attack scheme[/B] [U]Downloader[/U] -> Disable WD -> Download Malware.exe -> Run Malware.exe WD will never see [U]Malware,exe[/U] Disabling WD before the malware infects the PC also prevents malicious code from being sent to analysis systems in the WD Cloud. [/QUOTE]
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