FILE-OFFICE -- Snort detected traffic targeting vulnerabilities in files belonging to the Microsoft Office suite of software (Excel, PowerPoint, Word, Visio, Access, Outlook, etc.).
FILE-OFFICE Microsoft MSHTML ActiveX control bypass attempt
This rule looks for malicious crafted DOCX and RTF files, that specifically have the ability to launch a download from any site of the attacker's choice.
This rule will fire when malicious crafted DOCX and RTF files designed to exploit CVE-2021-40444 are detected on the network.
No public information
No known false positives
Cisco Talos Intelligence Group
No rule groups
Remote File Inclusion
Remote File Inclusion (RFI) attacks occur when a webserver takes a file crafted by an attacker as input and runs or stores it in an unsafe manner. For instance, the webserver could accept an image file that is actually code, then call it to execute after uploading. RFI attacks happen on web applications that dynamically include external files or scripts. A successful RFI can lead to data leaks, remote code execution, or cross site scripting. Avoid dynamic inclusion of user input files, or whitelist files that may be included. Keep the PHP allow_url_include option set to off; this will not protect against Local File Inclusion attacks.
CVE-2021-40444Microsoft MSHTML Remote Code Execution Vulnerability |
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Tactic: Initial Access
Technique: Trusted Relationship
For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org
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