APT_Turla_IronPython_Apr_2021_1

YARA detection rule by Arkbird_SOLG

Detect IronPython script used by Turla group

rule APT_Turla_IronPython_Apr_2021_1 {
   meta:
        description = "Detect IronPython script used by Turla group"
        author = "Arkbird_SOLG"
        reference = "https://twitter.com/DrunkBinary/status/1388332507695919104"
        date = "2021-04-30"
        hash1 = "65b43e30547ae4066229040c9056aa9243145b9ae5f3b9d0a01a5068ef9a0361"
        hash2 = "c430ebab4bf827303bc4ad95d40eecc7988bdc17cc139c8f88466bc536755d4e"
        hash3 = "f76257749792cc4e54f75d0e7a83e7a4429395c5dbc48078a8068575d7e9a98"
        tlp = "White"
        adversary = "Turla"
   strings:
        $s1 = { 6c 61 6d 62 64 61 20 73 2c 6b 3a 27 27 2e 6a 6f 69 6e 28 5b 63 68 72 28 28 6f 72 64 28 63 29 5e 6b 29 25 30 78 31 30 30 29 20 66 6f 72 20 63 20 69 6e 20 73 5d 29 } 
        $s2 = { 66 72 6f 6d 20 53 79 73 74 65 6d 2e 53 65 63 75 72 69 74 79 2e 43 72 79 70 74 6f 67 72 61 70 68 79 20 69 6d 70 6f 72 74 2a }
        $s3 = { 52 69 6a 6e 64 61 65 6c 4d 61 6e 61 67 65 64 28 4b 65 79 53 69 7a 65 3d 31 32 38 2c 42 6c 6f 63 6b 53 69 7a 65 3d 31 32 38 29 } 
        $s4 = { 72 65 74 75 72 6e 20 53 79 73 74 65 6d 2e 41 72 72 61 79 5b 53 79 73 74 65 6d 2e 42 79 74 65 5d 28 5b 6f 72 64 28 78 29 66 6f 72 20 78 20 69 6e 20 6c 69 73 74 28 73 74 72 29 5d 29 }
        $s5 = { 53 79 73 74 65 6d 2e 41 72 72 61 79 2e 43 72 65 61 74 65 49 6e 73 74 61 6e 63 65 28 53 79 73 74 65 6d 2e 42 79 74 65 2c [10-12] 2e 4c 65 6e 67 74 68 29 } 
        $s6 = { 28 62 61 73 65 36 34 2e 62 36 34 64 65 63 6f 64 65 28 [4-10] 5b 31 36 3a 5d 29 2c 73 79 73 2e 61 72 67 76 5b 31 5d 2c [4-10] 5b 3a 31 36 5d 2c } 
        $s7 = { 41 73 73 65 6d 62 6c 79 2e 4c 6f 61 64 28 }
        $s8 = { 20 69 66 20 6c 65 6e 28 73 79 73 2e 61 72 67 76 29 21 3d 32 3a } 
        $s9 = { 65 78 63 65 70 74 20 53 79 73 74 65 6d 2e 53 79 73 74 65 6d 45 78 63 65 70 74 69 6f 6e 20 61 73 20 65 78 3a } 
        $s10 = { 69 66 20 5f 5f 6e 61 6d 65 5f 5f 3d 3d } 
        $s11 = { 2e 66 6f 72 6d 61 74 28 65 78 2e 4d 65 73 73 61 67 65 2c 65 78 2e 53 74 61 63 6b 54 72 61 63 65 29 29 }
   condition:
        filesize > 100KB and 9 of ($s*)
}

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

6edec895-c763-40b9-a775-2e768e7db620

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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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