malware_sakula_loader

YARA detection rule by David Cannings/NCCGroup · GPL-2.0

A small DLL loader (~6KiB) for Sakula malware

rule malware_sakula_loader {
  meta:
    description = "A small DLL loader (~6KiB) for Sakula malware"
    author = "David Cannings/NCCGroup"
    reference = "https://github.com/nccgroup/Cyber-Defence/tree/master/Technical%20Notes/Sakula"
    md5 = "58d56d6e2cafca33e5a9303a36228ef6"

  strings:
    
        $opcodes_string_stack01 = { 6A 69 68 70 2E 6D 73 68 73 65 74 75 }

    
    $opcodes_decode_loop = { 48 83 F8 00 0F ?? ?? ?? ?? ?? 8A 18 80 F3 ?? 80 FB 00 }

        $str01 = "Win32 Program!"
    $str02 = "GoLink, GoAsm www.GoDevTool.com"

  condition:
    1 of ($opcodes*) and 1 of ($str*)
}

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

ad149a64-31d6-46ef-8c02-a42467c6796e

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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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