rule win_sepulcher_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.sepulcher."
        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.sepulcher"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 8bf9 0fb64722 83e801 7439 }
            // n = 4, score = 100
            //   8bf9                 | mov                 edi, ecx
            //   0fb64722             | movzx               eax, byte ptr [edi + 0x22]
            //   83e801               | sub                 eax, 1
            //   7439                 | je                  0x3b

        $sequence_1 = { e8???????? 85c0 0f8434030000 6828080000 33ff 8d85ccf7ffff 57 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8434030000         | je                  0x33a
            //   6828080000           | push                0x828
            //   33ff                 | xor                 edi, edi
            //   8d85ccf7ffff         | lea                 eax, [ebp - 0x834]
            //   57                   | push                edi

        $sequence_2 = { 741c 85db 7507 c746346c5c0110 57 ff7634 c6463c01 }
            // n = 7, score = 100
            //   741c                 | je                  0x1e
            //   85db                 | test                ebx, ebx
            //   7507                 | jne                 9
            //   c746346c5c0110       | mov                 dword ptr [esi + 0x34], 0x10015c6c
            //   57                   | push                edi
            //   ff7634               | push                dword ptr [esi + 0x34]
            //   c6463c01             | mov                 byte ptr [esi + 0x3c], 1

        $sequence_3 = { 8b4508 83c40c 89851cd8ffff 8b8618250000 898540d8ffff }
            // n = 5, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83c40c               | add                 esp, 0xc
            //   89851cd8ffff         | mov                 dword ptr [ebp - 0x27e4], eax
            //   8b8618250000         | mov                 eax, dword ptr [esi + 0x2518]
            //   898540d8ffff         | mov                 dword ptr [ebp - 0x27c0], eax

        $sequence_4 = { 8a1c01 eb40 8a5dff eb3b 8b4f30 8b4718 f6c101 }
            // n = 7, score = 100
            //   8a1c01               | mov                 bl, byte ptr [ecx + eax]
            //   eb40                 | jmp                 0x42
            //   8a5dff               | mov                 bl, byte ptr [ebp - 1]
            //   eb3b                 | jmp                 0x3d
            //   8b4f30               | mov                 ecx, dword ptr [edi + 0x30]
            //   8b4718               | mov                 eax, dword ptr [edi + 0x18]
            //   f6c101               | test                cl, 1

        $sequence_5 = { 8d8424f0040000 50 ffd6 6a10 59 }
            // n = 5, score = 100
            //   8d8424f0040000       | lea                 eax, [esp + 0x4f0]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   6a10                 | push                0x10
            //   59                   | pop                 ecx

        $sequence_6 = { 7437 3df2030000 7530 56 6a00 68???????? eb1c }
            // n = 7, score = 100
            //   7437                 | je                  0x39
            //   3df2030000           | cmp                 eax, 0x3f2
            //   7530                 | jne                 0x32
            //   56                   | push                esi
            //   6a00                 | push                0
            //   68????????           |                     
            //   eb1c                 | jmp                 0x1e

        $sequence_7 = { 59 6a25 8bfa f3ab 59 6a64 58 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   6a25                 | push                0x25
            //   8bfa                 | mov                 edi, edx
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   59                   | pop                 ecx
            //   6a64                 | push                0x64
            //   58                   | pop                 eax

        $sequence_8 = { 56 50 68???????? 8d8424d4710000 6800040000 50 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   50                   | push                eax
            //   68????????           |                     
            //   8d8424d4710000       | lea                 eax, [esp + 0x71d4]
            //   6800040000           | push                0x400
            //   50                   | push                eax

        $sequence_9 = { 7428 ba00010000 663bc2 741e ba00020000 663bc2 }
            // n = 6, score = 100
            //   7428                 | je                  0x2a
            //   ba00010000           | mov                 edx, 0x100
            //   663bc2               | cmp                 ax, dx
            //   741e                 | je                  0x20
            //   ba00020000           | mov                 edx, 0x200
            //   663bc2               | cmp                 ax, dx

    condition:
        7 of them and filesize < 279552
}