SmartApeSG_JS_NetSupportRAT_stage2

YARA detection rule by RussianPanda

Detects SmartApeSG JavaScript Stage 2 retrieving NetSupportRAT

rule SmartApeSG_JS_NetSupportRAT_stage2 {
    meta:
        author = "RussianPanda"
        description = "Detects SmartApeSG JavaScript Stage 2 retrieving NetSupportRAT"
        date = "1/11/2024"
        modified = "1/12/2024"
        hash = "67d8f84b37732cf85e05b327ad6b6a9f"
    strings:
        $x1 = "powershell.exe -Ex Bypass -NoP -C $"
        $x2 = "Get-Random -Minimum -1000 -Maximum 1000"

        $s1 = "HKCU:\\\\SOFTWARE\\\\Microsoft\\\\Windows\\\\CurrentVersion\\\\Run"
        $s2 = "=new ActiveXObject('W"
        $s3 = "System.Net.WebClient).DownloadString($"
        $s4 = "FromBase64String"
        $s5 = "Start-Process -FilePath $"
    condition:
        filesize < 1MB 
        and (
            ( 1 of ($x*) and 3 of them )
            or 5 of them
        )
}

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

0d1602f4-45f0-4ba8-b437-61e154c1fb2e

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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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