rule win_htran_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.htran."
        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.htran"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { c744243001000000 ff15???????? 83f8ff 750e 813d????????14270000 7537 }
            // n = 6, score = 200
            //   c744243001000000     | mov                 dword ptr [esp + 0x30], 1
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   750e                 | jne                 0x10
            //   813d????????14270000     |     
            //   7537                 | jne                 0x39

        $sequence_1 = { 50 e8???????? 8d8c2418f30000 53 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d8c2418f30000       | lea                 ecx, [esp + 0xf318]
            //   53                   | push                ebx

        $sequence_2 = { 897808 8b15???????? 83c00c 8d1452 8d1495f09b4000 }
            // n = 5, score = 200
            //   897808               | mov                 dword ptr [eax + 8], edi
            //   8b15????????         |                     
            //   83c00c               | add                 eax, 0xc
            //   8d1452               | lea                 edx, [edx + edx*2]
            //   8d1495f09b4000       | lea                 edx, [edx*4 + 0x409bf0]

        $sequence_3 = { 51 e8???????? 8b570c 8be8 52 e8???????? }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b570c               | mov                 edx, dword ptr [edi + 0xc]
            //   8be8                 | mov                 ebp, eax
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_4 = { 83e103 f3aa ff15???????? 8b742418 e9???????? b900140000 33c0 }
            // n = 7, score = 200
            //   83e103               | and                 ecx, 3
            //   f3aa                 | rep stosb           byte ptr es:[edi], al
            //   ff15????????         |                     
            //   8b742418             | mov                 esi, dword ptr [esp + 0x18]
            //   e9????????           |                     
            //   b900140000           | mov                 ecx, 0x1400
            //   33c0                 | xor                 eax, eax

        $sequence_5 = { 89742424 51 6a00 52 68???????? 6a00 }
            // n = 6, score = 200
            //   89742424             | mov                 dword ptr [esp + 0x24], esi
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   52                   | push                edx
            //   68????????           |                     
            //   6a00                 | push                0

        $sequence_6 = { ff15???????? 85c0 7d14 68???????? e8???????? 83c404 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7d14                 | jge                 0x16
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_7 = { 89442410 c705????????03000000 8b442410 8b0d???????? 49 743a }
            // n = 6, score = 200
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   c705????????03000000     |     
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   8b0d????????         |                     
            //   49                   | dec                 ecx
            //   743a                 | je                  0x3c

        $sequence_8 = { 8816 46 8a10 40 0fb6da f683c1c3400004 740c }
            // n = 7, score = 200
            //   8816                 | mov                 byte ptr [esi], dl
            //   46                   | inc                 esi
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   40                   | inc                 eax
            //   0fb6da               | movzx               ebx, dl
            //   f683c1c3400004       | test                byte ptr [ebx + 0x40c3c1], 4
            //   740c                 | je                  0xe

        $sequence_9 = { ff15???????? ebb6 6a00 8d8c2424010000 6800500000 }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   ebb6                 | jmp                 0xffffffb8
            //   6a00                 | push                0
            //   8d8c2424010000       | lea                 ecx, [esp + 0x124]
            //   6800500000           | push                0x5000

    condition:
        7 of them and filesize < 114688
}