CRIM_FIN7_PS_Cryptor_Jun_2021_1

YARA detection rule by Arkbird_SOLG

Detect PS Cryptor used by FIN7 for Diceloader and Carbanak

rule CRIM_FIN7_PS_Cryptor_Jun_2021_1 {
    meta:
        description = "Detect PS Cryptor used by FIN7 for Diceloader and Carbanak"
        author = "Arkbird_SOLG"
        reference = "https://twitter.com/z0ul_/status/1401795117678219267"
        date = "2021-06-07"
        hash1 = "944e47dc9da19b753beba173214cdebea2aa3651c402dfacae2dde82c4fdaa43"
        hash2 = "fada67a9f89429d6c191cd6fef5d75cd7b49eebaa2e40d1dd1f9884b3038a23b"
        hash3 = "0f083aac77fb734a8e81fb9dff218f0414ac6c4c9a23b2832837fbc2c7e2031d"
        hash4 = "dc9442838b464e96281a32705c9b5958e4f45dbefd1ef4a885fac9898af0a4b7"
        hash5 = "fad295cf65552061dc553c21d89d8bbd0b02783c01f5e696232df6a14381c206"
        tlp = "White"
        adversary = "FIN7"
    strings:
        $s1 = { 3d 4e 65 77 2d 4f 62 6a 65 63 74 20 49 4f 2e 43 6f 6d 70 72 65 73 73 69 6f 6e 2e 44 65 66 6c 61 74 65 53 74 72 65 61 6d 28 5b 49 4f 2e 4d 65 6d 6f 72 79 53 74 72 65 61 6d 5d 5b 42 79 74 65 5b 5d [6-12] 5b 49 4f 2e 43 6f 6d 70 72 65 73 73 69 6f 6e 2e 43 6f 6d 70 72 65 73 73 69 6f 6e 4d 6f 64 65 5d 3a 3a 44 65 63 6f 6d 70 72 65 73 73 29 }
        $s2 = { 40 28 5b 49 6e 74 50 74 72 5d 2c 5b 55 49 6e 74 33 32 5d 2c 5b 55 49 6e 74 33 32 5d 2c 5b 55 49 6e 74 33 32 5d 29 28 5b 49 6e 74 50 74 72 5d 29 }
        $s3 = { 2c 20 24 6e 75 6c 6c 2c 20 5b 53 79 73 74 65 6d 2e 52 65 66 6c 65 63 74 69 6f 6e 2e 43 61 6c 6c 69 6e 67 43 6f 6e 76 65 6e 74 69 6f 6e 73 5d 3a 3a 41 6e 79 2c 20 40 28 28 4e 65 77 2d 4f 62 6a 65 63 74 20 53 79 73 74 65 6d 2e 52 75 6e 74 69 6d 65 2e 49 6e 74 65 72 6f 70 53 65 72 76 69 63 65 73 2e 48 61 6e 64 6c 65 52 65 66 29 2e 47 65 74 54 79 70 65 28 29 2c 20 5b 73 74 72 69 6e 67 5d 29 2c 20 24 6e 75 6c 6c }
        $s4 = { 5b 53 79 73 74 65 6d 2e 52 75 6e 74 69 6d 65 2e 49 6e 74 65 72 6f 70 53 65 72 76 69 63 65 73 2e 4d 61 72 73 68 61 6c 5d 3a 3a 47 65 74 44 65 6c 65 67 61 74 65 46 6f 72 46 75 6e 63 74 69 6f 6e 50 6f 69 6e 74 65 72 28 }
        $s5 = { 2c 20 24 6e 75 6c 6c 2c 20 5b 53 79 73 74 65 6d 2e 52 65 66 6c 65 63 74 69 6f 6e 2e 43 61 6c 6c 69 6e 67 43 6f 6e 76 65 6e 74 69 6f 6e 73 5d 3a 3a 41 6e 79 2c 20 40 28 5b 73 74 72 69 6e 67 5d 29 2c 20 24 6e 75 6c 6c 29 }
        $s6 = { 5b 41 70 70 44 6f 6d 61 69 6e 5d 3a 3a 43 75 72 72 65 6e 74 44 6f 6d 61 69 6e 2e 47 65 74 41 73 73 65 6d 62 6c 69 65 73 28 29 20 7c 20 57 68 65 72 65 2d 4f 62 6a 65 63 74 20 7b 20 24 5f 2e 47 6c 6f 62 61 6c 41 73 73 65 6d 62 6c 79 43 61 63 68 65 20 2d 41 6e 64 20 24 5f 2e 4c 6f 63 61 74 69 6f 6e 2e 53 70 6c 69 74 28 27 5c 5c 27 29 5b 2d 31 5d 2e 45 71 75 61 6c 73 28 28 }
        $s7 = { 2c 20 5b 53 79 73 74 65 6d 2e 52 65 66 6c 65 63 74 69 6f 6e 2e 43 61 6c 6c 69 6e 67 43 6f 6e 76 65 6e 74 69 6f 6e 73 5d 3a 3a 53 74 61 6e 64 61 72 64 2c }
        $s8 = { 5b 53 79 73 74 65 6d 2e 52 75 6e 74 69 6d 65 2e 49 6e 74 65 72 6f 70 53 65 72 76 69 63 65 73 2e 48 61 6e 64 6c 65 52 65 66 5d 28 4e 65 77 2d 4f 62 6a 65 63 74 20 53 79 73 74 65 6d 2e 52 75 6e 74 69 6d 65 2e 49 6e 74 65 72 6f 70 53 65 72 76 69 63 65 73 2e 48 61 6e 64 6c 65 52 65 66 28 24 }
        $s9 = { 3d 5b 53 79 73 74 65 6d 2e 52 75 6e 74 69 6d 65 2e 49 6e 74 65 72 6f 70 53 65 72 76 69 63 65 73 2e 4d 61 72 73 68 61 6c 5d 3a 3a 47 65 74 44 65 6c 65 67 61 74 65 46 6f 72 46 75 6e 63 74 69 6f 6e 50 6f 69 6e 74 65 72 28 24 }
        $s10 = { 5b 53 79 73 74 65 6d 2e 52 75 6e 74 69 6d 65 2e 49 6e 74 65 72 6f 70 53 65 72 76 69 63 65 73 2e 4d 61 72 73 68 61 6c 5d 3a 3a 43 6f 70 79 28 24 }
        $s11 = { 3d 5b 49 6e 74 50 74 72 5d 3a 3a 5a 65 72 6f }
    condition:
        filesize > 40KB and 8 of ($s*)
}

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

b7aec860-698e-49f7-b58a-971e5b982709

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