Ran_RanzyLocker_Hunting_Mar_2021_1

YARA detection rule by Arkbird_SOLG

Detect RanzyLocker ransomware

rule Ran_RanzyLocker_Hunting_Mar_2021_1 {
   meta:
        description = "Detect RanzyLocker ransomware"
        author = "Arkbird_SOLG"
        reference = "Internal Research"
        date = "2021-03-16"
        hash1 = "5d0af3bf0dc7d99fc87d844a0fcd99796b9257ba02d78510422c498d445f0d0d"
   strings:
        $s1 = "-nolan" fullword wide
        $s2 = { 34 33 33 41 35 43 35 30 37 32 36 46 36 37 37 32 36 31 36 44 32 30 34 36 36 39 36 43 36 35 37 33 32 30 32 38 37 38 33 38 33 36 32 39 35 43 34 44 36 39 36 33 37 32 36 46 37 33 36 46 36 36 37 34 32 30 35 33 35 31 34 43 32 30 35 33 36 35 37 32 37 36 36 35 37 32 }         $s3 = { 34 33 33 41 35 43 35 30 37 32 36 46 36 37 37 32 36 31 36 44 32 30 34 36 36 39 36 43 36 35 37 33 35 43 34 44 36 39 36 33 37 32 36 46 37 33 36 46 36 36 37 34 32 30 35 33 35 31 34 43 32 30 35 33 36 35 37 32 37 36 36 35 37 32 }         $s4 = { 32 32 37 33 37 35 36 32 36 39 36 34 32 32 33 41 32 32 00 00 32 32 36 43 36 31 36 45 36 37 32 32 33 41 32 32 }         $s5 = { 32 32 36 43 36 31 36 45 36 37 32 32 33 41 32 32 }         $s6 = { 32 32 36 35 37 38 37 34 32 32 33 41 32 32 }         $s7 = { 32 32 36 42 36 35 37 39 32 32 33 41 32 32 }         $s8 = { 32 32 36 45 36 35 37 34 37 37 36 46 37 32 36 42 32 32 33 41 32 32 }         $s9 = { 36 32 36 33 36 34 36 35 36 34 36 39 37 34 32 45 36 35 37 38 36 35 32 30 32 46 37 33 36 35 37 34 32 30 37 42 36 34 36 35 36 36 36 31 37 35 36 43 37 34 37 44 32 30 36 32 36 46 36 46 37 34 37 33 37 34 36 31 37 34 37 35 37 33 37 30 36 46 36 43 36 39 36 33 37 39 32 30 36 39 36 37 36 45 36 46 37 32 36 35 36 31 36 43 36 43 36 36 36 31 36 39 36 43 37 35 37 32 36 35 37 33 }         $s10 = { 36 32 36 33 36 34 36 35 36 34 36 39 37 34 32 45 36 35 37 38 36 35 32 30 32 46 37 33 36 35 37 34 32 30 37 42 36 34 36 35 36 36 36 31 37 35 36 43 37 34 37 44 32 30 37 32 36 35 36 33 36 46 37 36 36 35 37 32 37 39 36 35 36 45 36 31 36 32 36 43 36 35 36 34 32 30 34 45 36 46 }         $s11 = { 37 37 36 44 36 39 36 33 32 45 36 35 37 38 36 35 32 30 35 33 34 38 34 31 34 34 34 46 35 37 34 33 34 46 35 30 35 39 32 30 32 46 36 45 36 46 36 39 36 45 37 34 36 35 37 32 36 31 36 33 37 34 36 39 37 36 36 35 }         $s12 = { 35 33 34 46 34 36 35 34 35 37 34 31 35 32 34 35 35 43 34 44 36 39 36 33 37 32 36 46 37 33 36 46 36 36 37 34 35 43 34 35 35 32 34 39 34 34 }         $s13 = { 37 32 36 35 36 31 36 34 36 44 36 35 32 45 37 34 37 38 37 34 }    condition:
        uint16(0) == 0x5a4d and filesize > 100KB and 10 of ($s*)
}

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

91419c2f-8bb7-4a5b-9e7e-cd84ad072cdc

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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

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

[[ currentRule.title ]]

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