rule win_bart_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "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 = { 50 ff15???????? 85c0 7409 6aff 50 ff15???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7409                 | je                  0xb
            //   6aff                 | push                -1
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_1 = { 5d c20400 b8???????? e8???????? 83ec10 8365f000 53 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   b8????????           |                     
            //   e8????????           |                     
            //   83ec10               | sub                 esp, 0x10
            //   8365f000             | and                 dword ptr [ebp - 0x10], 0
            //   53                   | push                ebx

        $sequence_2 = { 724c 80c1ff 79e8 5f 5e 8b4c2464 33cc }
            // n = 7, score = 100
            //   724c                 | jb                  0x4e
            //   80c1ff               | add                 cl, 0xff
            //   79e8                 | jns                 0xffffffea
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8b4c2464             | mov                 ecx, dword ptr [esp + 0x64]
            //   33cc                 | xor                 ecx, esp

        $sequence_3 = { 3c19 7738 ff75f0 8d8564ffffff 8bce 50 e8???????? }
            // n = 7, score = 100
            //   3c19                 | cmp                 al, 0x19
            //   7738                 | ja                  0x3a
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   8d8564ffffff         | lea                 eax, [ebp - 0x9c]
            //   8bce                 | mov                 ecx, esi
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { 59 33f6 8945f4 897dfc 6a04 58 85ff }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   33f6                 | xor                 esi, esi
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   6a04                 | push                4
            //   58                   | pop                 eax
            //   85ff                 | test                edi, edi

        $sequence_5 = { 85c0 0f84db010000 ff75b8 ff75b4 ff75d4 ff15???????? 8bf0 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   0f84db010000         | je                  0x1e1
            //   ff75b8               | push                dword ptr [ebp - 0x48]
            //   ff75b4               | push                dword ptr [ebp - 0x4c]
            //   ff75d4               | push                dword ptr [ebp - 0x2c]
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_6 = { 4f 75e5 8b5d94 6a07 ff7590 8d55e0 8d4da0 }
            // n = 7, score = 100
            //   4f                   | dec                 edi
            //   75e5                 | jne                 0xffffffe7
            //   8b5d94               | mov                 ebx, dword ptr [ebp - 0x6c]
            //   6a07                 | push                7
            //   ff7590               | push                dword ptr [ebp - 0x70]
            //   8d55e0               | lea                 edx, [ebp - 0x20]
            //   8d4da0               | lea                 ecx, [ebp - 0x60]

        $sequence_7 = { 50 53 ffd7 8b4618 c1e808 8845ff }
            // n = 6, score = 100
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ffd7                 | call                edi
            //   8b4618               | mov                 eax, dword ptr [esi + 0x18]
            //   c1e808               | shr                 eax, 8
            //   8845ff               | mov                 byte ptr [ebp - 1], al

        $sequence_8 = { 02c8 0255ef 33f6 884df1 8855f2 0fb64435f0 }
            // n = 6, score = 100
            //   02c8                 | add                 cl, al
            //   0255ef               | add                 dl, byte ptr [ebp - 0x11]
            //   33f6                 | xor                 esi, esi
            //   884df1               | mov                 byte ptr [ebp - 0xf], cl
            //   8855f2               | mov                 byte ptr [ebp - 0xe], dl
            //   0fb64435f0           | movzx               eax, byte ptr [ebp + esi - 0x10]

        $sequence_9 = { ff75fc ff15???????? ff75fc ff15???????? 53 56 57 }
            // n = 7, score = 100
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi

    condition:
        7 of them and filesize < 163840
}