Windows_Ransomware_GandCrab_8d0ca31d

YARA detection rule by Elastic Security · Elastic License v2

Rule Windows_Ransomware_GandCrab_8d0ca31d (No description metadata provided).

rule Windows_Ransomware_GandCrab_8d0ca31d {
    meta:
        author = "Elastic Security"
        id = "8d0ca31d-82e6-426a-a5fc-8a7fe626aab7"
        fingerprint = "cb010fd6254fd4383d5a815cfe5ebdd74a67720de09de336d16e38871f0a57eb"
        creation_date = "2024-08-27"
        last_modified = "2024-09-30"
        threat_name = "Windows.Ransomware.GandCrab"
        reference_sample = "29eee4f8b088ec1cdac03a04ca834479fce9a0fdf696224c6f19d573f4e2a703"
        severity = 100
        arch_context = "x86, arm64"
        scan_context = "file, memory"
        license = "Elastic License v2"
        os = "windows"
    strings:
        $ = "%s\\KRAB-DECRYPT.txt" wide fullword
        $ = { 6A 6E 58 6A 74 66 89 44 24 34 8B F2 58 6A 64 89 4C 24 18 59 6A 6C 5A 66 89 44 24 32 6A 2E 58 66 89 44 24 3A 33 C0 66 89 4C 24 34 66 89 4C 24 3C 8D 4C 24 30 66 89 54 24 36 66 89 54 24 38 66 89 54 24 3E 66 89 54 24 40 89 44 24 42 E8 }
        $ = { 6A 2D 58 66 89 45 90 6A 2D 58 66 89 45 92 6A 2D 58 66 89 45 94 6A 42 58 66 89 45 96 6A 45 58 66 89 45 98 6A 47 58 66 89 45 9A 6A 49 58 66 89 45 9C 6A 4E 58 66 89 45 9E 6A 20 58 66 89 45 A0 6A 50 58 66 89 45 A2 6A 43 58 66 89 45 A4 6A 20 58 66 89 45 A6 6A 44 58 66 89 45 A8 6A 41 58 66 89 45 AA 6A 54 58 66 89 45 AC 6A 41 58 66 89 45 AE 6A 2D 58 66 89 45 B0 6A 2D 58 66 89 45 B2 6A 2D 58 66 89 45 B4 33 C0 66 89 45 B6 }
    condition:
        2 of them
}

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

f28ec8e0-b436-4ebe-bf0c-c0ff7036a880

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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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