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Video Reviews - Security and Privacy
AppGuard bypassed (old version)
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<blockquote data-quote="hjlbx" data-source="post: 541969"><p>The video is a test of 4.3.1.3 - which has since been fixed. The current versions are 4.4.6.1 (AppGuard Professional) and 5.X.X.X (AppGuard Personal)</p><p></p><p>The malware uses a *.lnk file with an argument that points to Powershell. Powershell then downloads the ransomware from the net and writes it to c:\windows\temp and then executes it. I cannot recall, but I think a *.wfs file (wscript) is used as well. This video publisher posted two such scenarios - and I cannot remember the exact details of each - but both involved *.lnk files.</p><p></p><p>Malicious attacks using *.lnk files is not a common method, but I have seen it done.</p><p></p><p>BRN solved the issue in version 4.4 by adding Powershell to Guarded Apps and also blocking *.wfs files by default. Guarded Apps cannot write to c:\windows\temp. So an attack using Powershell as shown in the video is not possible with the current consumer versions.</p><p></p><p>* * * * *</p><p></p><p>I have submitted formal enhancements to have:</p><p></p><p>1. Powershell completely disabled by default in the consumer (non-Enterprise) versions of AppGuard</p><p>2. A generic protection against malicious *.lnk files with arguments; writable directories in System Space are to be treated the same as User Space</p><p></p><p>What 2 means is that a malicious *.lnk file with an argument can abuse a vulnerable Windows process not on the Guarded Apps list to download a malicious file, write it to any System Space directory that the OS allows, but AppGuard will block all executions from those directories.</p><p></p><p>This is the most effective way to do it without breaking anything...</p><p></p><p>Also, the way I have requested 2, it eliminates the need to add every vulnerable Windows process to the Guarded Apps list. Adding all vulnerable Windows processes can still be done - in order to mitigate an exploit attack - which is unrelated to the attack shown in the video - earlier in the run sequence - but there is no absolute need to do it.</p></blockquote><p></p>
[QUOTE="hjlbx, post: 541969"] The video is a test of 4.3.1.3 - which has since been fixed. The current versions are 4.4.6.1 (AppGuard Professional) and 5.X.X.X (AppGuard Personal) The malware uses a *.lnk file with an argument that points to Powershell. Powershell then downloads the ransomware from the net and writes it to c:\windows\temp and then executes it. I cannot recall, but I think a *.wfs file (wscript) is used as well. This video publisher posted two such scenarios - and I cannot remember the exact details of each - but both involved *.lnk files. Malicious attacks using *.lnk files is not a common method, but I have seen it done. BRN solved the issue in version 4.4 by adding Powershell to Guarded Apps and also blocking *.wfs files by default. Guarded Apps cannot write to c:\windows\temp. So an attack using Powershell as shown in the video is not possible with the current consumer versions. * * * * * I have submitted formal enhancements to have: 1. Powershell completely disabled by default in the consumer (non-Enterprise) versions of AppGuard 2. A generic protection against malicious *.lnk files with arguments; writable directories in System Space are to be treated the same as User Space What 2 means is that a malicious *.lnk file with an argument can abuse a vulnerable Windows process not on the Guarded Apps list to download a malicious file, write it to any System Space directory that the OS allows, but AppGuard will block all executions from those directories. This is the most effective way to do it without breaking anything... Also, the way I have requested 2, it eliminates the need to add every vulnerable Windows process to the Guarded Apps list. Adding all vulnerable Windows processes can still be done - in order to mitigate an exploit attack - which is unrelated to the attack shown in the video - earlier in the run sequence - but there is no absolute need to do it. [/QUOTE]
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