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Many of our users do leverage email clients and webmail that the rule targets. We registered no events relating to this control in the data we collected. Block executable content from email client and webmail #Set microsoft edge download rules in gpo update#Make sure you have an alternative update approach. Tip: Be careful with the Adobe update process. #Set microsoft edge download rules in gpo pdf#We’ve decided to accept the slight operational cost for the sake of additional security related to PDF malware. #Set microsoft edge download rules in gpo software#Rather than rolling back the rule, we opted to perform the Adobe updates via our central software patching and maintenance service so that there is no legitimate need for Adobe to be launching child processes. The update mechanism of the Adobe application attempts to launch a child process to do the work. ID: 7674BA52-32EB-4A4F-A9A1-F0F9A1619A2C Detection time: T19:35:03.723Z User: DOMAIN\User Path: C:\xxx\ Acrobat_DC_Set-Up.exe Process Name: C:\xxx\AcroRd32.exe Security intelligence Version: 1.325.883.0 Engine Version: 0.4 Product Version. For more information please contact your IT administrator. Here’s an example event: Message=Windows Defender Exploit Guard has blocked an operation that is not allowed by your IT administrator. We identified early in our ASR journey that “Block Adobe Reader Child Process” does cause a minor issue related to the way Adobe currently approaches updates for some products. ![]() Block Adobe Reader from creating child processes We feel this rule would be safe to deploy in block mode in almost any corporate environment. We configured this rule in block mode on day one and didn’t register a single event related to this ASR rule over the past 18 months. Rule breakdown Block untrusted and unsigned processes that run from USBĬonfiguring “Block untrusted and unsigned processes that run from USB” in block mode caused no issues whatsoever. ![]() ![]() An alternative is to create multiple policies where exceptions need to be granted to block mode rules, configuring the exceptions as higher priority group policies, restricted by “apply group policy“ access control entries on the group policy object. You can use a single policy for all ASR rules you’ll just need to decide between block mode and audit mode for each setting you configure. Our ASR deployment was configured by setting the group policy settings described here. Our WEF guide can be found here and configuration samples here. #Set microsoft edge download rules in gpo windows#Audit mode on its own will provide an excellent source of data for defenders and can be configured fleet wide in most corporate environments in under an hour using group policy.Ī note on ASR deployment and event log forwarding: At Palantir, we make heavy use of Windows Event Forwarding (WEF) to collect the 11 events for analysis. The obvious challenge is that Windows is likely to restrict legitimate use cases in some environments and that’s what we are hoping to help avoid with this post. It’s very likely that you’ll be dealing with a different set of constraints in the networks you protect.įor those looking to dive right in to the logs in their environment, the information will be recorded in two different events:Ĭonfiguring any ASR setting in block mode will cause Windows to deny the behavior and also log the event. ![]() Please refer to the descriptions below this summary section for the reasons we’ve made the recommendations. We aimed to be somewhat opinionated in this post to provide value to readers but we also acknowledge that all of the settings have their own environmental nuance. Attack surface reduction rules can constrain these kinds of risky behaviors and help keep your organization safe. Such behaviors are sometimes seen in legitimate applications however, they are considered risky because they are commonly abused by malware.
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