rule win_bh_a006_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.bh_a006."
        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.bh_a006"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 03de eb09 8bde 2bda 2bd8 83eb05 85c9 }
            // n = 7, score = 100
            //   03de                 | add                 ebx, esi
            //   eb09                 | jmp                 0xb
            //   8bde                 | mov                 ebx, esi
            //   2bda                 | sub                 ebx, edx
            //   2bd8                 | sub                 ebx, eax
            //   83eb05               | sub                 ebx, 5
            //   85c9                 | test                ecx, ecx

        $sequence_1 = { 8d4f01 030e 3b0e 7e72 }
            // n = 4, score = 100
            //   8d4f01               | lea                 ecx, [edi + 1]
            //   030e                 | add                 ecx, dword ptr [esi]
            //   3b0e                 | cmp                 ecx, dword ptr [esi]
            //   7e72                 | jle                 0x74

        $sequence_2 = { 8bd8 663938 75de 8b7d08 2bf7 d1fe 8bc6 }
            // n = 7, score = 100
            //   8bd8                 | mov                 ebx, eax
            //   663938               | cmp                 word ptr [eax], di
            //   75de                 | jne                 0xffffffe0
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   2bf7                 | sub                 esi, edi
            //   d1fe                 | sar                 esi, 1
            //   8bc6                 | mov                 eax, esi

        $sequence_3 = { 6689b5dcf9ffff 50 8d85def9ffff 680b020000 50 }
            // n = 5, score = 100
            //   6689b5dcf9ffff       | mov                 word ptr [ebp - 0x624], si
            //   50                   | push                eax
            //   8d85def9ffff         | lea                 eax, [ebp - 0x622]
            //   680b020000           | push                0x20b
            //   50                   | push                eax

        $sequence_4 = { 6a01 68050000c0 ff15???????? 8b7b08 85ff 7417 }
            // n = 6, score = 100
            //   6a01                 | push                1
            //   68050000c0           | push                0xc0000005
            //   ff15????????         |                     
            //   8b7b08               | mov                 edi, dword ptr [ebx + 8]
            //   85ff                 | test                edi, edi
            //   7417                 | je                  0x19

        $sequence_5 = { 50 ff7514 8b450c ff7510 83c0f2 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   83c0f2               | add                 eax, -0xe

        $sequence_6 = { 7d71 8b5514 81ff00000001 7318 3b5d0c }
            // n = 5, score = 100
            //   7d71                 | jge                 0x73
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]
            //   81ff00000001         | cmp                 edi, 0x1000000
            //   7318                 | jae                 0x1a
            //   3b5d0c               | cmp                 ebx, dword ptr [ebp + 0xc]

        $sequence_7 = { 59 59 85c0 0f859c040000 }
            // n = 4, score = 100
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   0f859c040000         | jne                 0x4a2

    condition:
        7 of them and filesize < 430080
}