rule win_thunderx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 395710 7507 32c0 e9???????? 837f1410 8bc7 8955fc }
            // n = 7, score = 200
            //   395710               | cmp                 dword ptr [edi + 0x10], edx
            //   7507                 | jne                 9
            //   32c0                 | xor                 al, al
            //   e9????????           |                     
            //   837f1410             | cmp                 dword ptr [edi + 0x14], 0x10
            //   8bc7                 | mov                 eax, edi
            //   8955fc               | mov                 dword ptr [ebp - 4], edx

        $sequence_1 = { 8b550c 8d045a 3bc1 7617 }
            // n = 4, score = 200
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   8d045a               | lea                 eax, [edx + ebx*2]
            //   3bc1                 | cmp                 eax, ecx
            //   7617                 | jbe                 0x19

        $sequence_2 = { 897318 8d7b1c 33c0 ab 53 6a01 }
            // n = 6, score = 200
            //   897318               | mov                 dword ptr [ebx + 0x18], esi
            //   8d7b1c               | lea                 edi, [ebx + 0x1c]
            //   33c0                 | xor                 eax, eax
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   53                   | push                ebx
            //   6a01                 | push                1

        $sequence_3 = { 83e4f8 81ec14010000 a1???????? 33c4 89842410010000 8b4510 89442408 }
            // n = 7, score = 200
            //   83e4f8               | and                 esp, 0xfffffff8
            //   81ec14010000         | sub                 esp, 0x114
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   89842410010000       | mov                 dword ptr [esp + 0x110], eax
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   89442408             | mov                 dword ptr [esp + 8], eax

        $sequence_4 = { 8b4048 f00fc118 4b 7515 8b4510 81784820014200 7409 }
            // n = 7, score = 200
            //   8b4048               | mov                 eax, dword ptr [eax + 0x48]
            //   f00fc118             | lock xadd           dword ptr [eax], ebx
            //   4b                   | dec                 ebx
            //   7515                 | jne                 0x17
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   81784820014200       | cmp                 dword ptr [eax + 0x48], 0x420120
            //   7409                 | je                  0xb

        $sequence_5 = { 8d4dd8 7407 e8???????? eb50 e8???????? 6a30 8bf0 }
            // n = 7, score = 200
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   7407                 | je                  9
            //   e8????????           |                     
            //   eb50                 | jmp                 0x52
            //   e8????????           |                     
            //   6a30                 | push                0x30
            //   8bf0                 | mov                 esi, eax

        $sequence_6 = { 5b 5f 5d c20800 6a38 b8???????? e8???????? }
            // n = 7, score = 200
            //   5b                   | pop                 ebx
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   6a38                 | push                0x38
            //   b8????????           |                     
            //   e8????????           |                     

        $sequence_7 = { a1???????? 83c0e4 83781408 7202 8b00 53 }
            // n = 6, score = 200
            //   a1????????           |                     
            //   83c0e4               | add                 eax, -0x1c
            //   83781408             | cmp                 dword ptr [eax + 0x14], 8
            //   7202                 | jb                  4
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   53                   | push                ebx

        $sequence_8 = { 55 8bec 8bd1 8b4d08 57 8b4214 8b7a10 }
            // n = 7, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8bd1                 | mov                 edx, ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   8b4214               | mov                 eax, dword ptr [edx + 0x14]
            //   8b7a10               | mov                 edi, dword ptr [edx + 0x10]

        $sequence_9 = { 8d7608 660fd60f 8d7f08 8b048dc49f4000 ffe0 f7c703000000 }
            // n = 6, score = 200
            //   8d7608               | lea                 esi, [esi + 8]
            //   660fd60f             | movq                qword ptr [edi], xmm1
            //   8d7f08               | lea                 edi, [edi + 8]
            //   8b048dc49f4000       | mov                 eax, dword ptr [ecx*4 + 0x409fc4]
            //   ffe0                 | jmp                 eax
            //   f7c703000000         | test                edi, 3

    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 )
}