Sublime Security medium experimental mql

Attachment: Archive with embedded CHM file

Recursively scans files and archives to detect embedded CHM (Microsoft Compiled HTML Help) files. According to CERT-UA, on March 7, 2022, phishing attacks targeted state organizations of Ukraine using Zip files with embedded CHM documents, which themselves contained malicious VBScript inside a .htm file. The activity is associated with UNC1151, according to CERT-UA.

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Detection Logic

type.inbound
and any(attachments,
        .file_extension in~ $file_extensions_common_archives
        and any(file.explode(.), .file_extension =~ "chm")
)

Field Validations

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