rule win_thanatos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.thanatos."
        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.thanatos"
        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 = { 85f6 7543 eb26 8d4d98 eb21 8d4dcc eb1c }
            // n = 7, score = 500
            //   85f6                 | test                esi, esi
            //   7543                 | jne                 0x45
            //   eb26                 | jmp                 0x28
            //   8d4d98               | lea                 ecx, [ebp - 0x68]
            //   eb21                 | jmp                 0x23
            //   8d4dcc               | lea                 ecx, [ebp - 0x34]
            //   eb1c                 | jmp                 0x1e

        $sequence_1 = { 8a4415ec 3086e75b0210 ff15???????? 3bf0 }
            // n = 4, score = 500
            //   8a4415ec             | mov                 al, byte ptr [ebp + edx - 0x14]
            //   3086e75b0210         | xor                 byte ptr [esi + 0x10025be7], al
            //   ff15????????         |                     
            //   3bf0                 | cmp                 esi, eax

        $sequence_2 = { 50 ff15???????? 8d45c8 8945e4 8d45e0 }
            // n = 5, score = 500
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d45c8               | lea                 eax, [ebp - 0x38]
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   8d45e0               | lea                 eax, [ebp - 0x20]

        $sequence_3 = { e8???????? bad74ffba4 8bcf a3???????? e8???????? 8b35???????? }
            // n = 6, score = 500
            //   e8????????           |                     
            //   bad74ffba4           | mov                 edx, 0xa4fb4fd7
            //   8bcf                 | mov                 ecx, edi
            //   a3????????           |                     
            //   e8????????           |                     
            //   8b35????????         |                     

        $sequence_4 = { 83c408 eb02 33c0 a3???????? }
            // n = 4, score = 500
            //   83c408               | add                 esp, 8
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   a3????????           |                     

        $sequence_5 = { c745e47773325f c745e833322e64 66c745ec6c6c c645ee00 c745f06e74646c c745f46c2e646c }
            // n = 6, score = 500
            //   c745e47773325f       | mov                 dword ptr [ebp - 0x1c], 0x5f327377
            //   c745e833322e64       | mov                 dword ptr [ebp - 0x18], 0x642e3233
            //   66c745ec6c6c         | mov                 word ptr [ebp - 0x14], 0x6c6c
            //   c645ee00             | mov                 byte ptr [ebp - 0x12], 0
            //   c745f06e74646c       | mov                 dword ptr [ebp - 0x10], 0x6c64746e
            //   c745f46c2e646c       | mov                 dword ptr [ebp - 0xc], 0x6c642e6c

        $sequence_6 = { 7414 8b4df4 81c900000002 894e04 8b4d24 83c108 eb03 }
            // n = 7, score = 500
            //   7414                 | je                  0x16
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   81c900000002         | or                  ecx, 0x2000000
            //   894e04               | mov                 dword ptr [esi + 4], ecx
            //   8b4d24               | mov                 ecx, dword ptr [ebp + 0x24]
            //   83c108               | add                 ecx, 8
            //   eb03                 | jmp                 5

        $sequence_7 = { 68???????? 50 ff15???????? 83c40c e8???????? 50 8d85ecfeffff }
            // n = 7, score = 500
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   e8????????           |                     
            //   50                   | push                eax
            //   8d85ecfeffff         | lea                 eax, [ebp - 0x114]

        $sequence_8 = { 8d842428020000 50 8d84242c010000 68???????? 50 ff15???????? }
            // n = 6, score = 500
            //   8d842428020000       | lea                 eax, [esp + 0x228]
            //   50                   | push                eax
            //   8d84242c010000       | lea                 eax, [esp + 0x12c]
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_9 = { 99 f7ff 68???????? 46 8a4415f4 30864f580210 ff15???????? }
            // n = 7, score = 500
            //   99                   | cdq                 
            //   f7ff                 | idiv                edi
            //   68????????           |                     
            //   46                   | inc                 esi
            //   8a4415f4             | mov                 al, byte ptr [ebp + edx - 0xc]
            //   30864f580210         | xor                 byte ptr [esi + 0x1002584f], al
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 1810432
}