win_xmrig_dga_b9

YARA detection rule by Johannes Bader @viql · MIT

detects a XMRig malware with DGA based on the Bitcoin Genesis Block

rule win_xmrig_dga_b9 {

    meta:
        author      = "Johannes Bader @viql"
        date        = "2022-07-23"
        description = "detects a XMRig malware with DGA based on the Bitcoin Genesis Block"
        tlp         = "TLP:WHITE"
        version     = "v1.1"
        hash_md5    = "5c13ee5dbe45d02ed74ef101b2e82ae6"
        hash_sha1   = "bdc36bc233675e7a96faa2c4917e9b756cc2a2a0"
        hash_sha256 = "ad1e39076212d8d58ff45d1e24d681fe0c600304bd20388cddcf9182b1d28c2f"

    strings:
        $str_json_1 = "\"bytes\": ["
        $str_json_2 = "\"subtype\": "
        $str_json_3 = "{\"bytes\":["
        $str_json_4 = "],\"subtype\":"
        $str_json_5 = "null}"
        $str_json_6 = "<discarded>"
        $str_json_7 = "[json.exception."

        
        $split_hash_1 = {8A 55 ?? 88 14 08 C6 44 08 01 00 EB}
        
        $split_hash_2 = {43 83 FB 10 0F 8C}

        
        $format_the_date = {6A 00 6A 00 89 55 EC 89 45 E8}

    condition:
        uint16(0) == 0x5A4D and 
        all of ($str_json_*) and
        all of ($split_hash_*) and
        $format_the_date
}

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

743481ef-92ac-4a4c-ab67-839a9e51fff9

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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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