rule win_thanatos_ransom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.thanatos_ransom."
        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_ransom"
        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 = { c3 8d4da4 e9???????? e8???????? c3 8b542408 8d420c }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   8d4da4               | lea                 ecx, [ebp - 0x5c]
            //   e9????????           |                     
            //   e8????????           |                     
            //   c3                   | ret                 
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8d420c               | lea                 eax, [edx + 0xc]

        $sequence_1 = { 7524 0f57c0 c745dc786e4200 68???????? 8d45dc 660fd645e0 }
            // n = 6, score = 100
            //   7524                 | jne                 0x26
            //   0f57c0               | xorps               xmm0, xmm0
            //   c745dc786e4200       | mov                 dword ptr [ebp - 0x24], 0x426e78
            //   68????????           |                     
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   660fd645e0           | movq                qword ptr [ebp - 0x20], xmm0

        $sequence_2 = { 2bca 51 8d85f8feffff 8bcf 50 e8???????? }
            // n = 6, score = 100
            //   2bca                 | sub                 ecx, edx
            //   51                   | push                ecx
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   8bcf                 | mov                 ecx, edi
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_3 = { 668906 663907 7414 8bc7 8d5002 }
            // n = 5, score = 100
            //   668906               | mov                 word ptr [esi], ax
            //   663907               | cmp                 word ptr [edi], ax
            //   7414                 | je                  0x16
            //   8bc7                 | mov                 eax, edi
            //   8d5002               | lea                 edx, [eax + 2]

        $sequence_4 = { 00d0 33d4 33d8 33dc 33e0 }
            // n = 5, score = 100
            //   00d0                 | add                 al, dl
            //   33d4                 | xor                 edx, esp
            //   33d8                 | xor                 ebx, eax
            //   33dc                 | xor                 ebx, esp
            //   33e0                 | xor                 esp, eax

        $sequence_5 = { 8b048dc4b24000 ffe0 f7c703000000 7413 8a06 }
            // n = 5, score = 100
            //   8b048dc4b24000       | mov                 eax, dword ptr [ecx*4 + 0x40b2c4]
            //   ffe0                 | jmp                 eax
            //   f7c703000000         | test                edi, 3
            //   7413                 | je                  0x15
            //   8a06                 | mov                 al, byte ptr [esi]

        $sequence_6 = { 8d8d40ffffff e8???????? 57 e8???????? 83c404 }
            // n = 5, score = 100
            //   8d8d40ffffff         | lea                 ecx, [ebp - 0xc0]
            //   e8????????           |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_7 = { 8d8502ffffff 6a00 50 c785f0feffff00000000 660fd685f8feffff }
            // n = 5, score = 100
            //   8d8502ffffff         | lea                 eax, [ebp - 0xfe]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   c785f0feffff00000000     | mov    dword ptr [ebp - 0x110], 0
            //   660fd685f8feffff     | movq                qword ptr [ebp - 0x108], xmm0

        $sequence_8 = { 57 8b0485e0774300 80640828fe ff15???????? }
            // n = 4, score = 100
            //   57                   | push                edi
            //   8b0485e0774300       | mov                 eax, dword ptr [eax*4 + 0x4377e0]
            //   80640828fe           | and                 byte ptr [eax + ecx + 0x28], 0xfe
            //   ff15????????         |                     

        $sequence_9 = { 53 56 6a00 6a00 ff15???????? 8b7508 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]

    condition:
        7 of them and filesize < 516096
}