rule win_bart_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.bart."
        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.bart"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { ff7604 ff15???????? 3bc3 7439 8d4668 }
            // n = 5, score = 100
            //   ff7604               | push                dword ptr [esi + 4]
            //   ff15????????         |                     
            //   3bc3                 | cmp                 eax, ebx
            //   7439                 | je                  0x3b
            //   8d4668               | lea                 eax, dword ptr [esi + 0x68]

        $sequence_1 = { 0f8509010000 395e20 0f8500010000 395e18 0f85f7000000 395e14 }
            // n = 6, score = 100
            //   0f8509010000         | jne                 0x10f
            //   395e20               | cmp                 dword ptr [esi + 0x20], ebx
            //   0f8500010000         | jne                 0x106
            //   395e18               | cmp                 dword ptr [esi + 0x18], ebx
            //   0f85f7000000         | jne                 0xfd
            //   395e14               | cmp                 dword ptr [esi + 0x14], ebx

        $sequence_2 = { ffd7 8a460c 8845ff 8d45ff 6a01 50 53 }
            // n = 7, score = 100
            //   ffd7                 | call                edi
            //   8a460c               | mov                 al, byte ptr [esi + 0xc]
            //   8845ff               | mov                 byte ptr [ebp - 1], al
            //   8d45ff               | lea                 eax, dword ptr [ebp - 1]
            //   6a01                 | push                1
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_3 = { 85f6 7f1f 7c08 81fb00004006 7315 807df300 8b4da8 }
            // n = 7, score = 100
            //   85f6                 | test                esi, esi
            //   7f1f                 | jg                  0x21
            //   7c08                 | jl                  0xa
            //   81fb00004006         | cmp                 ebx, 0x6400000
            //   7315                 | jae                 0x17
            //   807df300             | cmp                 byte ptr [ebp - 0xd], 0
            //   8b4da8               | mov                 ecx, dword ptr [ebp - 0x58]

        $sequence_4 = { 83c004 53 50 56 e8???????? 8b8558ffffff 8d8d7cffffff }
            // n = 7, score = 100
            //   83c004               | add                 eax, 4
            //   53                   | push                ebx
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b8558ffffff         | mov                 eax, dword ptr [ebp - 0xa8]
            //   8d8d7cffffff         | lea                 ecx, dword ptr [ebp - 0x84]

        $sequence_5 = { 50 6a04 8d45f8 50 57 ff15???????? b8ad540000 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   6a04                 | push                4
            //   8d45f8               | lea                 eax, dword ptr [ebp - 8]
            //   50                   | push                eax
            //   57                   | push                edi
            //   ff15????????         |                     
            //   b8ad540000           | mov                 eax, 0x54ad

        $sequence_6 = { 8d4304 8bd6 50 57 8bce 89856cffffff }
            // n = 6, score = 100
            //   8d4304               | lea                 eax, dword ptr [ebx + 4]
            //   8bd6                 | mov                 edx, esi
            //   50                   | push                eax
            //   57                   | push                edi
            //   8bce                 | mov                 ecx, esi
            //   89856cffffff         | mov                 dword ptr [ebp - 0x94], eax

        $sequence_7 = { 895de0 8d5f06 897de8 897de4 8b4118 8945ec 8b411c }
            // n = 7, score = 100
            //   895de0               | mov                 dword ptr [ebp - 0x20], ebx
            //   8d5f06               | lea                 ebx, dword ptr [edi + 6]
            //   897de8               | mov                 dword ptr [ebp - 0x18], edi
            //   897de4               | mov                 dword ptr [ebp - 0x1c], edi
            //   8b4118               | mov                 eax, dword ptr [ecx + 0x18]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8b411c               | mov                 eax, dword ptr [ecx + 0x1c]

        $sequence_8 = { 33c9 bb???????? 2bde 8d7907 }
            // n = 4, score = 100
            //   33c9                 | xor                 ecx, ecx
            //   bb????????           |                     
            //   2bde                 | sub                 ebx, esi
            //   8d7907               | lea                 edi, dword ptr [ecx + 7]

        $sequence_9 = { ffb554ffffff 8b80b0000000 ffd0 8b8558ffffff 8d8d7cffffff 8bd6 0fb600 }
            // n = 7, score = 100
            //   ffb554ffffff         | push                dword ptr [ebp - 0xac]
            //   8b80b0000000         | mov                 eax, dword ptr [eax + 0xb0]
            //   ffd0                 | call                eax
            //   8b8558ffffff         | mov                 eax, dword ptr [ebp - 0xa8]
            //   8d8d7cffffff         | lea                 ecx, dword ptr [ebp - 0x84]
            //   8bd6                 | mov                 edx, esi
            //   0fb600               | movzx               eax, byte ptr [eax]

    condition:
        7 of them and filesize < 163840
}