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Problem with SHA1 calculation

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What could be the reason that some detections do not have SHA-1 calculated? Also in these cases the Signature type and Signer Name are Unknow - the print screen below is for "powershell.exe", which triggers the rule [E0309]. For some events of this type, the SHA-1 calculation is correct, but for some it is empty and I cannot find the reason. I thought we had a compromised version of powershell.exe, but when manually verifying the file from computers, it's ok. Any ideas?


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If the problem occurs with the latest version 2.0.3549, please raise a support ticket for further investigation.

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