apt_Gamaredon_GammaLoad_MaliciousLNK

YARA detection rule by HydraDragonAntivirus · GPL-2.0

Detects Gamaredon's GammaLoad LNK

rule apt_Gamaredon_GammaLoad_MaliciousLNK {
  meta:
    id             = "2612e6c6-0bda-4bfa-a840-aa0a0b4c945b"
    version        = "1.0"
    malware        = "GammaLoad"
    intrusion_set  = "Gamaredon"
    description    = "Detects Gamaredon's GammaLoad LNK"
    source         = "SEKOIA"
    creation_date  = "2022-08-01"
    classification = "TLP:WHITE"

  strings:
    $mshta = "System32\\mshta.exe"
    $trait = { 0D 0A ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 0D 0A }

  condition:
    uint32be(0) == 0x4c000000 and
    #trait > 100 and $mshta and
    filesize > 100KB and filesize < 400KB
}

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

1511c889-ffda-400b-ae2e-ea33e98d865b

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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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