win_mal_Zloader

YARA detection rule by RussianPanda

Detects Zloader and other Zloader modules that employ the same encryption

rule win_mal_Zloader {
    meta:
        author = "RussianPanda"
        description = "Detects Zloader and other Zloader modules that employ the same encryption"
        date = "3/10/2024"
    strings:
        $s1 = {8B 45 ?? 89 45 ?? B9 ?? ?? ?? ?? E8 ?? ?? ?? ?? 89 C1 8B 45 ?? 99 F7 F9 8B 45 ?? 48 63 D2 48 8D 0D ?? ?? ?? 00 0F BE 0C 11 31 C8 88 C2 48 8B 45 F0 48 63 4D}
        $s2 = {48 63 C9 44 0F B6 04 08 48 8B 45 E8 8B 4D D4 0F B6 14 08 44 31 C2 88 14 08 8B 45 D4}
        $s3 = {B9 11 00 00 00 99 F7 F9 8B [0-20] 31 C8 88 C2}
        $s4 = {8B 45 ?? BE 11 00 00 00 99 F7 [0-20] 83 F6 FF}
    condition:
        uint16(0) == 0x5A4D and any of them
}

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

231cd673-3dfe-4918-8831-a0aeae27812d

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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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