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HighSigmaHQ Florian Roth (Nextron Systems) +2

File Decoded From Base64/Hex Via Certutil.EXE

Detects the execution of certutil with either the "decode" or "decodehex" flags to decode base64 or hex encoded files. This can be abused by attackers to decode an encoded payload before execution

Detection logic

Detection requirements

Platform: ESXi Linux macOS Network Devices Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: windows
Log source category: process_creation

Known benign triggers

Unknown

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
learn.microsoft.com/en-us/archive/blogs/pki/basic-crl-checking-with-certutil	Product documentation	Only this detection cites it
learn.microsoft.com/en-us/windows-server/administration/windows-commands/certutil	Product documentation	6
lolbas-project.github.io/lolbas/Binaries/Certutil/	Tool	6from 2 sources
news.sophos.com/en-us/2021/04/13/compromised-exchange-server-hosting-cryptojacker-targeting-other-exchange-servers/	Threat report	4
twitter.com/JohnLaTwC/status/835149808817991680	Social post	Only this detection cites it
unit42.paloaltonetworks.com/new-babyshark-malware-targets-u-s-national-security-think-tanks/	Threat report	2

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