MALWARE_Win_PWSHDLLDL

YARA detection rule by ditekShen · NOASSERTION

Detects downloader

import "pe"
rule MALWARE_Win_PWSHDLLDL {
    meta:
        author = "ditekShen"
        description = "Detects downloader"
    strings:
        $s1 = "powershell.exe Set-ExecutionPolicy Bypass -Scope Process ; powershell -file " fullword wide nocase
        $s2 = "objShell.run \"powershell -WindowStyle hidden -command wscript.exe //b //nologo '" fullword wide nocase
        $s3 = "cmd.exe /c schtasks.exe /create /tn \"" fullword wide nocase
        $s4 = "-WindowStyle hidden -command wscript.exe //b //nologo '" fullword wide nocase
        $s6 = "\" /tr \"wscript.exe //b //nologo '" fullword wide nocase
        $s7 = "\" -Value \"Powershell.exe -WindowStyle hidden \"\"& '" fullword wide nocase
        $op0 = { 61 01 00 34 53 79 73 74 65 6d 2e 57 65 62 2e 53 }
        $op1 = { 4b 04 00 00 34 01 00 00 7f 05 00 00 1a }
    condition:
        uint16(0) == 0x5a4d and pe.is_dll() and 5 of them
}

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

a27977c9-841d-4cd8-84b8-ba9d70b12e36

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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 ]]

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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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