apt_lazarus_gopuram_backdoor

YARA detection rule by Sekoia.io · GPL-2.0

Detects Gopuram Backdoor

import "pe"
rule apt_lazarus_gopuram_backdoor {
  meta:
    id             = "947d4ee3-79fa-450b-8482-beafe607baae"
    version        = "1.0"
    description    = "Detects Gopuram Backdoor"
    author         = "Sekoia.io"
    creation_date  = "2023-04-04"
    classification = "TLP:CLEAR"
    hash1          = "97b95b4a5461f950e712b82783930cb2a152ec0288c00a977983ca7788342df7"
    hash2          = "beb775af5196f30e0ee021790a4978ca7a7ac2a7cf970a5a620ffeb89cc60b2c"

  strings:
    $x1   = "%s\\config\\TxR\\%s.TxR.0.regtrans-ms"
    $xop  = { D1 E8 33 C3 D1 EB A8 01 74 ?? 81 F3 25 A3 87 DE D1 E8 33 C3 D1 EB A8 01 74 ?? 81 F3 25 A3 87 DE D1 E8 33 C3 D1 EB A8 01 74 ?? 81 F3 25 A3 87 DE D1 E8 33 C3 D1 EB A8 01 74 ?? 81 F3 25 A3 87 DE }
    $opa1 = { 48 89 44 24 ?? 45 33 C9 45 33 C0 33 D2 89 5C 24 ?? 48 89 74 24 ?? 48 89 5C 24 ?? 89 7C 24 ?? FF 15 ?? ?? ?? ?? 85 C0 74 ?? 48 8B 4C 24 ?? 4C 8D 4C 24 ?? 44 8D 43 ?? }
    $opa2 = { 48 89 B4 24 ?? ?? ?? ?? 44 8D 43 ?? 33 D2 48 89 BC 24 ?? ?? ?? ?? 4C 89 B4 24 ?? ?? ?? ?? E8 ?? ?? ?? ?? 48 8B 4C 24 ?? E8 ?? ?? ?? ?? 48 8B 4C 24 ?? 45 33 C0 33 D2 8B F8 E8 ?? ?? ?? ?? 8D 4F ?? E8 ?? ?? ?? ?? 4C 8B 4C 24 ?? 44 8D 43 ?? 48 8B C8 8B D7 48 8B F0 44 8B F7 E8 ?? ?? ?? ?? 48 8B 4C 24 ?? E8 ?? ?? ?? }

  condition:
    (uint16(0) == 0x4d5a and filesize < 2MB
      and pe.characteristics & pe.DLL and 1 of ($x*)
    )
    or all of ($opa*)
}

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

c20729e3-7b85-4b04-9b73-d76793743171

Propose edits, view related rules, and engage with the community through comments.

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 ]]

Community Discussion