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Best solution for PC-prebuilts at bigger scale?
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<blockquote data-quote="Andy Ful" data-source="post: 976266" data-attributes="member: 32260"><p><strong>According to Microsoft, the "Cloud protection level" settings can significantly improve anti-ransomware protection. </strong></p><p></p><p>The most valuable protection of MS Office is the ASR rule:</p><p><a href="https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-all-office-applications-from-creating-child-processes" target="_blank">Block all Office applications from creating child processes</a></p><p>It can prevent most attacks via weaponized documents. </p><p></p><p>Other important rules are related to scripts:</p><p><a href="https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-execution-of-potentially-obfuscated-scripts" target="_blank">Block execution of potentially obfuscated scripts</a></p><p><a href="https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-javascript-or-vbscript-from-launching-downloaded-executable-content" target="_blank">Block JavaScript or VBScript from launching downloaded executable content</a></p><p></p><p>Of course, all ASR rules are valuable, but others will probably require adding some exclusions. You can look here:</p><p>[URL unfurl="true"]https://medium.com/palantir/microsoft-defender-attack-surface-reduction-recommendations-a5c7d41c3cf8[/URL]</p><p></p><p>The rule; "<a href="https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#use-advanced-protection-against-ransomware" target="_blank">Use advanced protection against ransomware</a>" can also produce more false positives.</p><p></p><p></p><p></p><p>You can look at the FirewallHardening (Recommended H_C) rules. The most effective is blocking scripting Interpreters and some popular LOLBins used to download payloads.</p><p></p><p></p><p></p><p>Could you post some additional info about what compatibility errors did you encounter and what rules were involved? Did the Administrator use exclusions for ASR rules? One can exclude files and folders in ASR - but, any exclusion is applied to all ASR rules that allow exclusions</p><p></p><p>The rule "<a href="https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-executable-files-from-running-unless-they-meet-a-prevalence-age-or-trusted-list-criterion" target="_blank">Block executable files from running unless they meet a prevalence, age, or trusted list criterion</a>" is a kind of file reputation rule, so it will produce more false positives when installing/updating applications.</p><p></p><p>The rule "<a href="https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-untrusted-and-unsigned-processes-that-run-from-usb" target="_blank">Block untrusted and unsigned processes that run from USB</a>" is a similar reputation-based rule, but the age criterium is skipped. It will block most of the unsigned applications originating from the USB drive.</p><p></p><p></p><p></p><p>The lack of MOTW invalidates the BAFS. From the known packers, the Windows built-in ZIP, Bandizip, and Explzh can preserve the MOTW.</p></blockquote><p></p>
[QUOTE="Andy Ful, post: 976266, member: 32260"] [B]According to Microsoft, the "Cloud protection level" settings can significantly improve anti-ransomware protection. [/B] The most valuable protection of MS Office is the ASR rule: [URL='https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-all-office-applications-from-creating-child-processes']Block all Office applications from creating child processes[/URL] It can prevent most attacks via weaponized documents. Other important rules are related to scripts: [URL='https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-execution-of-potentially-obfuscated-scripts']Block execution of potentially obfuscated scripts[/URL] [URL='https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-javascript-or-vbscript-from-launching-downloaded-executable-content']Block JavaScript or VBScript from launching downloaded executable content[/URL] Of course, all ASR rules are valuable, but others will probably require adding some exclusions. You can look here: [URL unfurl="true"]https://medium.com/palantir/microsoft-defender-attack-surface-reduction-recommendations-a5c7d41c3cf8[/URL] The rule; "[URL='https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#use-advanced-protection-against-ransomware']Use advanced protection against ransomware[/URL]" can also produce more false positives. You can look at the FirewallHardening (Recommended H_C) rules. The most effective is blocking scripting Interpreters and some popular LOLBins used to download payloads. Could you post some additional info about what compatibility errors did you encounter and what rules were involved? Did the Administrator use exclusions for ASR rules? One can exclude files and folders in ASR - but, any exclusion is applied to all ASR rules that allow exclusions The rule "[URL='https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-executable-files-from-running-unless-they-meet-a-prevalence-age-or-trusted-list-criterion']Block executable files from running unless they meet a prevalence, age, or trusted list criterion[/URL]" is a kind of file reputation rule, so it will produce more false positives when installing/updating applications. The rule "[URL='https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-untrusted-and-unsigned-processes-that-run-from-usb']Block untrusted and unsigned processes that run from USB[/URL]" is a similar reputation-based rule, but the age criterium is skipped. It will block most of the unsigned applications originating from the USB drive. The lack of MOTW invalidates the BAFS. From the known packers, the Windows built-in ZIP, Bandizip, and Explzh can preserve the MOTW. [/QUOTE]
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