DITEKSHEN_MALWARE_Win_Clop

YARA detection rule by ditekSHen · GPL-2.0

Detects Clop ransomware variants

rule DITEKSHEN_MALWARE_Win_Clop: FILE {
  meta:
    description = "Detects Clop ransomware variants"
    author      = "ditekSHen"
    id          = "d3c9e950-8b03-5d19-8448-9cf208813df2"
    date        = "2024-05-28"
    modified    = "2024-05-28"
    reference   = "https://github.com/ditekshen/detection"
    source_url  = "https://github.com/ditekshen/detection/blob/2ddbbe14eea1f342bca2cfd09a643a40ae2fcaf6/yara/malware.yar#L4869-L4889"
    license_url = "https://github.com/ditekshen/detection/blob/2ddbbe14eea1f342bca2cfd09a643a40ae2fcaf6/LICENSE.txt"
    logic_hash  = "a1a21100c468c4db147f97b0724b7a3aefbb92b157071bfe6f61d02768573b44"
    score       = 75
    quality     = 75
    tags        = "FILE"

  strings:
    $x1 = "Cllp^_-" ascii
    $s2 = "temp.dat" fullword wide
    $s3 = "README_README.txt" wide
    $s4 = "BEGIN PUBLIC KEY" ascii
    $s5 = "runrun" wide
    $s6 = "wevtutil.exe" ascii
    $s7 = "%s%s.Cllp" fullword wide
    $s8 = "WinCheckDRVs" fullword wide
    $o1 = { 6a ff 56 89 9d 28 dd ff ff ff d0 a1 64 32 41 00 }
    $o2 = { 56 89 9d 28 dd ff ff ff 15 78 32 41 00 eb 07 43 }
    $o3 = { 68 ?? 34 41 00 8d 85 58 dd ff ff 50 ff d7 85 c0 }
    $o4 = { 68 d0 34 41 00 50 ff d6 8b bd 28 d5 ff ff 83 c4 }
    $o5 = { a1 64 32 41 00 43 56 89 9d 08 d5 ff ff ff d0 8b }

  condition:
    uint16(0) == 0x5a4d and (all of ($s*) or (1 of ($x*) and (3 of ($s*) or 4 of ($o*))) or (all of ($o*) and 2 of ($s*)) or (4 of ($s*) and 4 of ($o*)))
}

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

b24bfe2a-38d2-41a3-98e1-882560a4109b

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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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