Microsoft Office Composite Moniker Remote Code Execution

Credit: Rich Warren
Risk: High
Local: No
Remote: Yes

## What? This repo contains a Proof of Concept exploit for CVE-2017-8570, a.k.a the "Composite Moniker" vulnerability. This demonstrates using the Packager.dll trick to drop an sct file into the %TEMP% directory, and then execute it using the primitive that the vulnerability provides. ## Why? A few reasons. 1. I wanted to see if it was possible to use the [Packager.dll file-dropping trick]( to exploit this vulnerability. 2. As far as I'm aware, all other public exploits for CVE-2017-8570 are actually exploiting the "Script Moniker" variant of CVE-2017-0199 and are not actually composite moniker exploits. 3. Raise awareness of exploitation techniques used in the wild, and help defenders to detect exploitation attempts. ## How to run Simply run the script, providing an Sct file to execute, and an output name for your RTF file: python -s calc.sct -o example.rtf [+] RTF file written to: example.rtf ## Detection I have included a Yara rule to detect attempts to exploit this vulnerability via RTF. ## References - - -


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