rule win_thunderx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.thunderx."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.thunderx"
        malpedia_rule_date = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { a3???????? 8b4104 a3???????? 8b4108 }
            // n = 4, score = 200
            //   a3????????           |                     
            //   8b4104               | mov                 eax, dword ptr [ecx + 4]
            //   a3????????           |                     
            //   8b4108               | mov                 eax, dword ptr [ecx + 8]

        $sequence_1 = { ff15???????? 51 50 8d4dd4 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   51                   | push                ecx
            //   50                   | push                eax
            //   8d4dd4               | lea                 ecx, dword ptr [ebp - 0x2c]

        $sequence_2 = { e8???????? e8???????? 8d4c240c e8???????? }
            // n = 4, score = 200
            //   e8????????           |                     
            //   e8????????           |                     
            //   8d4c240c             | lea                 ecx, dword ptr [esp + 0xc]
            //   e8????????           |                     

        $sequence_3 = { 8845d5 8b45b0 895db8 c745d801000000 8b0485701b4200 8945d0 81f9e9fd0000 }
            // n = 7, score = 200
            //   8845d5               | mov                 byte ptr [ebp - 0x2b], al
            //   8b45b0               | mov                 eax, dword ptr [ebp - 0x50]
            //   895db8               | mov                 dword ptr [ebp - 0x48], ebx
            //   c745d801000000       | mov                 dword ptr [ebp - 0x28], 1
            //   8b0485701b4200       | mov                 eax, dword ptr [eax*4 + 0x421b70]
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   81f9e9fd0000         | cmp                 ecx, 0xfde9

        $sequence_4 = { 59 1adb 59 fec3 eb02 32db e8???????? }
            // n = 7, score = 200
            //   59                   | pop                 ecx
            //   1adb                 | sbb                 bl, bl
            //   59                   | pop                 ecx
            //   fec3                 | inc                 bl
            //   eb02                 | jmp                 4
            //   32db                 | xor                 bl, bl
            //   e8????????           |                     

        $sequence_5 = { 8d4d90 e8???????? 833d????????00 0f8420040000 a1???????? 8d4ded 6a0a }
            // n = 7, score = 200
            //   8d4d90               | lea                 ecx, dword ptr [ebp - 0x70]
            //   e8????????           |                     
            //   833d????????00       |                     
            //   0f8420040000         | je                  0x426
            //   a1????????           |                     
            //   8d4ded               | lea                 ecx, dword ptr [ebp - 0x13]
            //   6a0a                 | push                0xa

        $sequence_6 = { e8???????? 8d4c243c e8???????? ba???????? 8d4c2424 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8d4c243c             | lea                 ecx, dword ptr [esp + 0x3c]
            //   e8????????           |                     
            //   ba????????           |                     
            //   8d4c2424             | lea                 ecx, dword ptr [esp + 0x24]

        $sequence_7 = { 03c9 e8???????? 5d c20400 e8???????? cc }
            // n = 6, score = 200
            //   03c9                 | add                 ecx, ecx
            //   e8????????           |                     
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   e8????????           |                     
            //   cc                   | int3                

        $sequence_8 = { 33c0 40 e9???????? 8365c000 c745c47c964000 a1???????? 8d4dc0 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   e9????????           |                     
            //   8365c000             | and                 dword ptr [ebp - 0x40], 0
            //   c745c47c964000       | mov                 dword ptr [ebp - 0x3c], 0x40967c
            //   a1????????           |                     
            //   8d4dc0               | lea                 ecx, dword ptr [ebp - 0x40]

        $sequence_9 = { c3 55 8bec 51 8b4214 53 8b5a10 }
            // n = 7, score = 200
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   8b4214               | mov                 eax, dword ptr [edx + 0x14]
            //   53                   | push                ebx
            //   8b5a10               | mov                 ebx, dword ptr [edx + 0x10]

    condition:
        7 of them and filesize < 319488
}

import "pe"

rule win_thunderx_w0 {
   meta:
      description = "Rule to dettect tthe ThunderX ransomware family"
      author = "Christiaan Beek @ McAfee ATR team"
      date = "2020-09-14"
      rule_version = "v1"
      malware_type = "ransomware"
      malware_family = "Ransomware:W32/ThunderX"
      actor_type = "Cybercrime"
      actor_group = "Unknown"
      hash1 = "7bab5dedef124803668580a59b6bf3c53cc31150d19591567397bbc131b9ccb6"
      hash2 = "0fbfdb8340108fafaca4c5ff4d3c9f9a2296efeb9ae89fcd9210e3d4c7239666"
      hash3 = "7527459500109b3bb48665236c5c5cb2ec71ba789867ad2b6417b38b9a46615e"
      source = "https://github.com/advanced-threat-research/Yara-Rules/blob/master/ransomware/Ransom_ThunderX.yar"
      malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.thunderx"
      malpedia_rule_date = "20200915"
      malpedia_hash = ""
      malpedia_version = "20200915"
      malpedia_license = "CC BY-SA 4.0"
      malpedia_sharing = "TLP:WHITE"

   strings:
   
      $pattern1 = "626364656469742E657865202F736574207B64656661756C747D20626F6F74737461747573706F6C6963792069676E6F7265616C6C6661696C75726573" 
     
      $s3 = "776261646D696E2044454C4554452053595354454D53544154454241434B5550202D64656C6574654F6C64657374" ascii
      $s4 = "626364656469742E657865202F736574207B64656661756C747D207265636F76657279656E61626C6564204E6F" ascii 
      $s5 = "776261646D696E2044454C4554452053595354454D53544154454241434B5550" ascii 
      $s6 = "433A5C50726F6772616D2046696C65732028783836295C4D6963726F736F66742053514C20536572766572" ascii 
      $s7 = "476C6F62616C5C33353335354641352D303745392D343238422D423541352D314338384341423242343838" ascii 
      $s8 = "433A5C50726F6772616D2046696C65735C4D6963726F736F66742053514C20536572766572" ascii 
      $s9 = "76737361646D696E2E6578652044656C65746520536861646F7773202F416C6C202F5175696574" ascii 
      $s10 = "776D69632E65786520534841444F57434F5059202F6E6F696E746572616374697665" ascii 
      $s11 = "534F4654574152455C4D6963726F736F66745C45524944" ascii 
      $s12 = "AppPolicyGetProcessTerminationMethod" fullword ascii
      $s13 = "7B5041545445524E5F49447D" ascii 
      $s14 = "726561646D652E747874" ascii 
      $s15 = "226E6574776F726B223A22" ascii 
      $s16 = "227375626964223A22" ascii 
      $s17 = "226C616E67223A22" ascii 
      $s18 = "22657874223A22" ascii 
      $s19 = "69642E6B6579" ascii 
      $s20 = "7B5549447D" ascii 

      $seq0 = { eb 34 66 0f 12 0d 10 c4 41 00 f2 0f 59 c1 ba cc }
      $seq1 = { 6a 07 50 e8 51 ff ff ff 8d 86 d0 }
      $seq2 = { ff 15 34 81 41 00 eb 15 83 f8 fc 75 10 8b 45 f4 }
   condition:
      ( uint16(0) == 0x5a4d and filesize < 400KB and pe.imphash() == "ea7e408cd2a264fd13492973e97d8d70" and $pattern1 and 4 of them ) and all of ($seq*) or ( all of them )
}