CISA_251155_02

YARA detection rule by CISA Code & Media Analysis · NOASSERTION

Detects Go-Based BRICKSTORM backdoor samples

rule CISA_251155_02 : BRICKSTORM backdoor installs_other_components communicates_with_c2 exfiltrates_data {
    meta:
        author = "CISA Code & Media Analysis"
        incident = "251155"
        date = "2025-09-15"
        last_modified = "20250916_1511"
        actor = "n/a"
        family = "BRICKSTORM"
        capabilities = "installs-other-components communicates-with-c2 exfiltrates-data"
        malware_type = "backdoor"
        tool_type = "unknown"
        description = "Detects Go-Based BRICKSTORM backdoor samples"
        sha256_1 = "320a0b5d4900697e125cebb5ff03dee7368f8f087db1c1570b0b62f5a986d759"
        sha256_1 = "dfac2542a0ee65c474b91d3b352540a24f4e223f1b808b741cfe680263f0ee44"
        sha256_1 = "b91881cb1aa861138f2063ec130b2b01a8aaf0e3f04921e5cbfc61b09024bf12"
        sha256_1 = "bfb3ffd46b21b2281374cd60bc756fe2dcc32486dcc156c9bd98f24101145454"
    strings:
        $s0 = { 04 30 0F B6 54 04 2C 31 D1 88 4C 04 34 48 FF C0 }
        $s1 = { 48 83 F8 04 7C E7 48 C7 04 24 }
        $s2 = { 48 8D 44 24 34 48 89 44 24 08 48 C7 44 24 10 04 }
        $s3 = { 48 89 44 24 48 48 89 4C 24 50 48 8B 6C 24 38 48 }
        $s4 = { 48 83 EC 40 48 89 6C 24 38 48 8D 6C 24 38 C7 44 24 }
        $s5 = { 83 EC 38 48 89 6C 24 30 48 8D 6C 24 30 C6 44 24 }
        $s6 = { 4C 24 20 48 89 44 24 40 48 89 4C 24 48 48 8B 6C }
        $s7 = { 64 48 8B 0C 25 F8 FF FF FF 48 3B 61 10 0F 86 81 }
        $s8 = { 64 48 8B 0C 25 F8 FF FF FF 48 3B 61 10 0F 86 91 }
    condition:
        all of them
}

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

5ad2c313-298c-47ba-9d0e-e27b74e423b1

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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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