rule win_thunderx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 8b4510 81784820014200 7409 ff7048 e8???????? 59 c70701000000 }
            // n = 7, score = 200
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   81784820014200       | cmp                 dword ptr [eax + 0x48], 0x420120
            //   7409                 | je                  0xb
            //   ff7048               | push                dword ptr [eax + 0x48]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   c70701000000         | mov                 dword ptr [edi], 1

        $sequence_1 = { 8d8ddcfdffff e8???????? 33ff 8d4d94 c645fc02 e8???????? }
            // n = 6, score = 200
            //   8d8ddcfdffff         | lea                 ecx, [ebp - 0x224]
            //   e8????????           |                     
            //   33ff                 | xor                 edi, edi
            //   8d4d94               | lea                 ecx, [ebp - 0x6c]
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   e8????????           |                     

        $sequence_2 = { 894508 8a02 42 88443dec 47 8a6dee 8a4dec }
            // n = 7, score = 200
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   8a02                 | mov                 al, byte ptr [edx]
            //   42                   | inc                 edx
            //   88443dec             | mov                 byte ptr [ebp + edi - 0x14], al
            //   47                   | inc                 edi
            //   8a6dee               | mov                 ch, byte ptr [ebp - 0x12]
            //   8a4dec               | mov                 cl, byte ptr [ebp - 0x14]

        $sequence_3 = { 83e03f c1f906 6bc038 03048d701b4200 50 ff15???????? 5d }
            // n = 7, score = 200
            //   83e03f               | and                 eax, 0x3f
            //   c1f906               | sar                 ecx, 6
            //   6bc038               | imul                eax, eax, 0x38
            //   03048d701b4200       | add                 eax, dword ptr [ecx*4 + 0x421b70]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   5d                   | pop                 ebp

        $sequence_4 = { 33db 8ac3 e8???????? c3 55 8bec }
            // n = 6, score = 200
            //   33db                 | xor                 ebx, ebx
            //   8ac3                 | mov                 al, bl
            //   e8????????           |                     
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_5 = { c20400 8b09 85c9 0f8501000000 c3 55 }
            // n = 6, score = 200
            //   c20400               | ret                 4
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   85c9                 | test                ecx, ecx
            //   0f8501000000         | jne                 7
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_6 = { 8d4dac e8???????? c645fc03 8d857cffffff 837d9008 ff758c 0f43857cffffff }
            // n = 7, score = 200
            //   8d4dac               | lea                 ecx, [ebp - 0x54]
            //   e8????????           |                     
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   8d857cffffff         | lea                 eax, [ebp - 0x84]
            //   837d9008             | cmp                 dword ptr [ebp - 0x70], 8
            //   ff758c               | push                dword ptr [ebp - 0x74]
            //   0f43857cffffff       | cmovae              eax, dword ptr [ebp - 0x84]

        $sequence_7 = { 33ff 47 897dfc 837db400 0f8429010000 68???????? }
            // n = 6, score = 200
            //   33ff                 | xor                 edi, edi
            //   47                   | inc                 edi
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   837db400             | cmp                 dword ptr [ebp - 0x4c], 0
            //   0f8429010000         | je                  0x12f
            //   68????????           |                     

        $sequence_8 = { 8b442424 81c70000a000 13c3 89442424 3b442414 0f8c49ffffff }
            // n = 6, score = 200
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   81c70000a000         | add                 edi, 0xa00000
            //   13c3                 | adc                 eax, ebx
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   3b442414             | cmp                 eax, dword ptr [esp + 0x14]
            //   0f8c49ffffff         | jl                  0xffffff4f

        $sequence_9 = { 837dbc18 750c 33c9 0fb6db 41 397da8 0f44d9 }
            // n = 7, score = 200
            //   837dbc18             | cmp                 dword ptr [ebp - 0x44], 0x18
            //   750c                 | jne                 0xe
            //   33c9                 | xor                 ecx, ecx
            //   0fb6db               | movzx               ebx, bl
            //   41                   | inc                 ecx
            //   397da8               | cmp                 dword ptr [ebp - 0x58], edi
            //   0f44d9               | cmove               ebx, ecx

    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 )
}