MetaStealer_NET_Reactor_packer

YARA detection rule by RussianPanda

Detects NET_Reactor_packer 12-2023 used in MetaStealer

rule MetaStealer_NET_Reactor_packer {
    meta:
        author = "RussianPanda"
        description = "Detects NET_Reactor_packer 12-2023 used in MetaStealer"
        date = "12/29/2023"

    strings:
        $s1 = {C7 84 24 80 02 00 00 24 02 00 00 C6 44 24}
		$s2 = "mscoree.dll" wide
		$s3 = {43 61 76 69 6c 73 20 43 6f 72 70 2e 20 32 30 31 30}
		$s4 = {80 F1 E7 80 F2 44 [16] 80 F1 4B 80 F2 23}

    condition:
        3 of ($s*) and filesize < 600KB
		
}

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

b4b1558e-8530-4625-8901-3b217a57379c

Propose edits, view related rules, and engage with the community through comments.

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 ]]

Community Discussion