rule win_htran_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        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 = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 8b842440510000 55 50 53 e8???????? 83c420 85c0 }
            // n = 7, score = 200
            //   8b842440510000       | mov                 eax, dword ptr [esp + 0x5140]
            //   55                   | push                ebp
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c420               | add                 esp, 0x20
            //   85c0                 | test                eax, eax

        $sequence_1 = { 33c9 894c2414 53 8b10 8b4004 }
            // n = 5, score = 200
            //   33c9                 | xor                 ecx, ecx
            //   894c2414             | mov                 dword ptr [esp + 0x14], ecx
            //   53                   | push                ebx
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]

        $sequence_2 = { 83c408 a1???????? 85c0 7405 }
            // n = 4, score = 200
            //   83c408               | add                 esp, 8
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7

        $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 = { 6a01 58 c20400 8b542404 }
            // n = 4, score = 200
            //   6a01                 | push                1
            //   58                   | pop                 eax
            //   c20400               | ret                 4
            //   8b542404             | mov                 edx, dword ptr [esp + 4]

        $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 = { 68???????? e8???????? 83c404 33c0 c3 83ec14 8b4c241c }
            // n = 7, score = 200
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   33c0                 | xor                 eax, eax
            //   c3                   | ret                 
            //   83ec14               | sub                 esp, 0x14
            //   8b4c241c             | mov                 ecx, dword ptr [esp + 0x1c]

        $sequence_7 = { 8bcb c1f805 83e11f 8b048500c54000 8d04c8 eb05 b8???????? }
            // n = 7, score = 200
            //   8bcb                 | mov                 ecx, ebx
            //   c1f805               | sar                 eax, 5
            //   83e11f               | and                 ecx, 0x1f
            //   8b048500c54000       | mov                 eax, dword ptr [eax*4 + 0x40c500]
            //   8d04c8               | lea                 eax, [eax + ecx*8]
            //   eb05                 | jmp                 7
            //   b8????????           |                     

        $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 = { 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
}