Ransom_Loader_Lockbit_V3

YARA detection rule by HydraDragonAntivirus · GPL-2.0

Yara rule for the encrypted Lockbit 3.0 binary

import "pe"
import "math"
rule Ransom_Loader_Lockbit_V3 {
  meta:
    reference   = "506f3b12853375a1fbbf85c82ddf13341cf941c5acd4a39a51d6addf145a7a51"
    description = "Yara rule for the encrypted Lockbit 3.0 binary"

  strings:
    $indirectPEBAccess = {
      33 C0           40              C1 E0 06        8D 40 F0        64 8B 00        C3            }

    $Hex2BinUpperCaseSnippet = {
      66 83 F8 41        72 ??              66 83 F8 46        77 06              66 83 E8 37        EB ??            }

    $GetCommandLineBuffer = {
      E8 ?? FF FF FF        8B 40 10              8B 40 44              C3                  }

  condition:
    uint16(0) == 0x5A4D and
            math.entropy(0, filesize) >= 6.3
    and for any section in pe.sections:
    (
      (
        section.name != ".text"
        and section.characteristics & 0xff == 0x20          and
        (
          pe.entry_point >= section.raw_data_offset and
          pe.entry_point <= (section.raw_data_offset + section.raw_data_size)
        )
        and $indirectPEBAccess in (section.raw_data_offset..(section.raw_data_offset + section.raw_data_size))
        and $Hex2BinUpperCaseSnippet in (section.raw_data_offset..(section.raw_data_offset + section.raw_data_size))
        and $GetCommandLineBuffer in (section.raw_data_offset..(section.raw_data_offset + section.raw_data_size))
      )
    )
}

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

ff268cca-be7e-4846-87b5-90b884e1db29

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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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