rule win_thunderx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 0f84ba000000 68???????? 8d4da8 e8???????? 6a0b 58 c645fc01 }
            // n = 7, score = 200
            //   0f84ba000000         | je                  0xc0
            //   68????????           |                     
            //   8d4da8               | lea                 ecx, [ebp - 0x58]
            //   e8????????           |                     
            //   6a0b                 | push                0xb
            //   58                   | pop                 eax
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1

        $sequence_1 = { 8945fc e8???????? 8bf0 8d4e01 51 e8???????? 897314 }
            // n = 7, score = 200
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8d4e01               | lea                 ecx, [esi + 1]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   897314               | mov                 dword ptr [ebx + 0x14], esi

        $sequence_2 = { c7459c02000000 eb15 51 56 8bcf e8???????? }
            // n = 6, score = 200
            //   c7459c02000000       | mov                 dword ptr [ebp - 0x64], 2
            //   eb15                 | jmp                 0x17
            //   51                   | push                ecx
            //   56                   | push                esi
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     

        $sequence_3 = { 50 8d45e4 50 ff15???????? 8d4dcc e8???????? 8d45cc }
            // n = 7, score = 200
            //   50                   | push                eax
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d4dcc               | lea                 ecx, [ebp - 0x34]
            //   e8????????           |                     
            //   8d45cc               | lea                 eax, [ebp - 0x34]

        $sequence_4 = { 51 51 ff7610 50 6a08 51 }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   ff7610               | push                dword ptr [esi + 0x10]
            //   50                   | push                eax
            //   6a08                 | push                8
            //   51                   | push                ecx

        $sequence_5 = { e8???????? ba???????? 8d8d58feffff e8???????? 8d8d30ffffff c645fc0c 51 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   ba????????           |                     
            //   8d8d58feffff         | lea                 ecx, [ebp - 0x1a8]
            //   e8????????           |                     
            //   8d8d30ffffff         | lea                 ecx, [ebp - 0xd0]
            //   c645fc0c             | mov                 byte ptr [ebp - 4], 0xc
            //   51                   | push                ecx

        $sequence_6 = { 50 e8???????? 834dfcff 8d4dd4 e8???????? a1???????? 8d48e4 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   834dfcff             | or                  dword ptr [ebp - 4], 0xffffffff
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]
            //   e8????????           |                     
            //   a1????????           |                     
            //   8d48e4               | lea                 ecx, [eax - 0x1c]

        $sequence_7 = { ba???????? e8???????? 8bf0 33db 395e10 7434 }
            // n = 6, score = 200
            //   ba????????           |                     
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   33db                 | xor                 ebx, ebx
            //   395e10               | cmp                 dword ptr [esi + 0x10], ebx
            //   7434                 | je                  0x36

        $sequence_8 = { 8a040e 8801 3bfa 72f1 8b4584 8bbd78ffffff 8d75bc }
            // n = 7, score = 200
            //   8a040e               | mov                 al, byte ptr [esi + ecx]
            //   8801                 | mov                 byte ptr [ecx], al
            //   3bfa                 | cmp                 edi, edx
            //   72f1                 | jb                  0xfffffff3
            //   8b4584               | mov                 eax, dword ptr [ebp - 0x7c]
            //   8bbd78ffffff         | mov                 edi, dword ptr [ebp - 0x88]
            //   8d75bc               | lea                 esi, [ebp - 0x44]

        $sequence_9 = { 895dc8 8975bc 8975c0 8975c4 8975fc 8d45d4 52 }
            // n = 7, score = 200
            //   895dc8               | mov                 dword ptr [ebp - 0x38], ebx
            //   8975bc               | mov                 dword ptr [ebp - 0x44], esi
            //   8975c0               | mov                 dword ptr [ebp - 0x40], esi
            //   8975c4               | mov                 dword ptr [ebp - 0x3c], esi
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   52                   | push                edx

    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 )
}