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26 lines
1.5 KiB
Markdown
26 lines
1.5 KiB
Markdown
## Code Signing Certificate Cloning Attack
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A Powershell script that signs input Executable file with fake Microsoft code-signing certificate to demonstrate risks of cloned-certificate sign attacks.
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Script was shamelessly borrowed from [Matt Graeber, @mattifestation](https://twitter.com/mattifestation) and his research titled:
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- [_Code Signing Certificate Cloning Attacks and Defenses_](https://posts.specterops.io/code-signing-certificate-cloning-attacks-and-defenses-6f98657fc6ec)
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**All credits go to Matt** - this directory contains a copy of his code (_bit tweaked by me_) for preserverance purposes.
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### Effectiveness
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As of [13/07/2022](https://twitter.com/mariuszbit/status/1547320418821980160) this **dumb trick** still gets off the shelf malware evade detection of at least 8 modern security scanners.
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| What | Result |
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|------------------------------------------------------------------------------|-----------|
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| Mythic Apollo.exe before fake-signing | [30/70](https://www.virustotal.com/gui/file/1413de7cee2c7c161f814fe93256968450b4e99ae65f0b5e7c2e76128526cc73?nocache=1) |
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| Mythic Apollo.exe after fake-signing with Microsoft code-signing certificate | [22/70](https://www.virustotal.com/gui/file/34543de8a6b24c98ea526d8f2ae5f1dbe99d64386d8a8f46ddbcdcebaac3df65?nocache=1) |
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### Usage
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```
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PS C:\> . .\Sign-Artifact.ps1
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PS C:\> Sign-Artifact -InputFile malware.exe -OutputFile nomalware.exe -Verbose
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```
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