mal_msedge_dll_virusloader

YARA detection rule by RussianPanda

Detects malicious msedge.dll file

rule mal_msedge_dll_virusloader {
    meta:
        description = "Detects malicious msedge.dll file"
        author = "RussianPanda"
        reference = "https://blog.phylum.io/npm-package-found-delivering-sophisticated-rat/"
        date = "2024-01-19"
        hash = "ab2e3b07170ef1516af3af0d03388868"
    
    strings:
        $s1 = {C6 85 ?? FE FF FF ?? C6}
        $s2 = {C7 85 ?? FD FF FF}
        $s3 = {BF 60 01 00 00 [18] 30 04 39 41}
  
    condition:
        uint16(0) == 0x5A4D and all of ($s*) and #s1 > 30 and #s2 > 30 and filesize < 300KB
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

87fdb3af-f7c2-437d-8b9b-25af66602c0b

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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