rule win_htran_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 8b942430510000 55 52 68???????? e8???????? }
            // n = 5, score = 200
            //   8b942430510000       | mov                 edx, dword ptr [esp + 0x5130]
            //   55                   | push                ebp
            //   52                   | push                edx
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_1 = { 8d4c243c 50 51 52 ffd5 }
            // n = 5, score = 200
            //   8d4c243c             | lea                 ecx, [esp + 0x3c]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   52                   | push                edx
            //   ffd5                 | call                ebp

        $sequence_2 = { 8d3449 8d34b5f09b4000 83c00c 3bc6 7305 }
            // n = 5, score = 200
            //   8d3449               | lea                 esi, [ecx + ecx*2]
            //   8d34b5f09b4000       | lea                 esi, [esi*4 + 0x409bf0]
            //   83c00c               | add                 eax, 0xc
            //   3bc6                 | cmp                 eax, esi
            //   7305                 | jae                 7

        $sequence_3 = { 52 50 68???????? 03f0 2be8 e8???????? 83c410 }
            // n = 7, score = 200
            //   52                   | push                edx
            //   50                   | push                eax
            //   68????????           |                     
            //   03f0                 | add                 esi, eax
            //   2be8                 | sub                 ebp, eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10

        $sequence_4 = { ffd5 8bf8 8b442440 50 ff15???????? 50 53 }
            // n = 7, score = 200
            //   ffd5                 | call                ebp
            //   8bf8                 | mov                 edi, eax
            //   8b442440             | mov                 eax, dword ptr [esp + 0x40]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_5 = { 8b8424e0420100 33c9 894c2414 53 8b10 }
            // n = 5, score = 200
            //   8b8424e0420100       | mov                 eax, dword ptr [esp + 0x142e0]
            //   33c9                 | xor                 ecx, ecx
            //   894c2414             | mov                 dword ptr [esp + 0x14], ecx
            //   53                   | push                ebx
            //   8b10                 | mov                 edx, dword ptr [eax]

        $sequence_6 = { 8816 46 eb0f 0fb6d2 f682c1c3400004 }
            // n = 5, score = 200
            //   8816                 | mov                 byte ptr [esi], dl
            //   46                   | inc                 esi
            //   eb0f                 | jmp                 0x11
            //   0fb6d2               | movzx               edx, dl
            //   f682c1c3400004       | test                byte ptr [edx + 0x40c3c1], 4

        $sequence_7 = { 33c0 f3a4 b900500000 8dbc14ec020000 2bca }
            // n = 5, score = 200
            //   33c0                 | xor                 eax, eax
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   b900500000           | mov                 ecx, 0x5000
            //   8dbc14ec020000       | lea                 edi, [esp + edx + 0x2ec]
            //   2bca                 | sub                 ecx, edx

        $sequence_8 = { 33c0 8dbc24ec520000 f3ab 8d9424e4000000 52 53 }
            // n = 6, score = 200
            //   33c0                 | xor                 eax, eax
            //   8dbc24ec520000       | lea                 edi, [esp + 0x52ec]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8d9424e4000000       | lea                 edx, [esp + 0xe4]
            //   52                   | push                edx
            //   53                   | push                ebx

        $sequence_9 = { 899424e8010000 89b424e8000000 899424e4000000 33c0 8d8c24e8000000 }
            // n = 5, score = 200
            //   899424e8010000       | mov                 dword ptr [esp + 0x1e8], edx
            //   89b424e8000000       | mov                 dword ptr [esp + 0xe8], esi
            //   899424e4000000       | mov                 dword ptr [esp + 0xe4], edx
            //   33c0                 | xor                 eax, eax
            //   8d8c24e8000000       | lea                 ecx, [esp + 0xe8]

    condition:
        7 of them and filesize < 114688
}