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dubseven dropper dialog remains

yara LOW Yara-Rules
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This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-06-05T23:00:00Z · Confidence: medium

Hunt Hypothesis

The hypothesis is that the presence of the “dubseven_dropper_dialog_remains” YARA rule indicates potential residual artifacts from a malicious dropper, which may be used to identify early-stage compromise. SOC teams should proactively hunt for this behavior in Azure Sentinel to detect and respond to advanced persistent threats before they establish a persistent foothold.

YARA Rule

rule dubseven_dropper_dialog_remains
{
   
    meta:
        author = "Matt Brooks, @cmatthewbrooks"
        desc = "Searches for related dialog remnants. How rude."
    
    strings:
        $dia1 = "fuckMessageBox 1.0" wide
        $dia2 = "Rundll 1.0" wide
        
    condition:
        //MZ header //PE signature
        uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550 and any of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 2 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/APT_UP007_SLServer.yar