rule win_meduza_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.meduza."
        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.meduza"
        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 = { 7424 6a0d eb19 8b0c9d70884a00 8a443928 a840 7508 }
            // n = 7, score = 100
            //   7424                 | je                  0x26
            //   6a0d                 | push                0xd
            //   eb19                 | jmp                 0x1b
            //   8b0c9d70884a00       | mov                 ecx, dword ptr [ebx*4 + 0x4a8870]
            //   8a443928             | mov                 al, byte ptr [ecx + edi + 0x28]
            //   a840                 | test                al, 0x40
            //   7508                 | jne                 0xa

        $sequence_1 = { c745fc05000000 8b0d???????? 8b4904 8b8970924a00 85c9 7405 8b11 }
            // n = 7, score = 100
            //   c745fc05000000       | mov                 dword ptr [ebp - 4], 5
            //   8b0d????????         |                     
            //   8b4904               | mov                 ecx, dword ptr [ecx + 4]
            //   8b8970924a00         | mov                 ecx, dword ptr [ecx + 0x4a9270]
            //   85c9                 | test                ecx, ecx
            //   7405                 | je                  7
            //   8b11                 | mov                 edx, dword ptr [ecx]

        $sequence_2 = { 8d7e90 8b4004 c74430906cea4900 8b07 8b4804 8d4190 8944318c }
            // n = 7, score = 100
            //   8d7e90               | lea                 edi, [esi - 0x70]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   c74430906cea4900     | mov                 dword ptr [eax + esi - 0x70], 0x49ea6c
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   8d4190               | lea                 eax, [ecx - 0x70]
            //   8944318c             | mov                 dword ptr [ecx + esi - 0x74], eax

        $sequence_3 = { e8???????? 8d8d78fcffff c645fc1f e8???????? 83ec10 8d8d98feffff 8bf4 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d8d78fcffff         | lea                 ecx, [ebp - 0x388]
            //   c645fc1f             | mov                 byte ptr [ebp - 4], 0x1f
            //   e8????????           |                     
            //   83ec10               | sub                 esp, 0x10
            //   8d8d98feffff         | lea                 ecx, [ebp - 0x168]
            //   8bf4                 | mov                 esi, esp

        $sequence_4 = { c785dcf6ffff7b4c4a4f 8b85d8f6ffff 8b8ddcf6ffff 8985a8f0ffff 898dacf0ffff c785d8f6ffff0a664eff }
            // n = 6, score = 100
            //   c785dcf6ffff7b4c4a4f     | mov    dword ptr [ebp - 0x924], 0x4f4a4c7b
            //   8b85d8f6ffff         | mov                 eax, dword ptr [ebp - 0x928]
            //   8b8ddcf6ffff         | mov                 ecx, dword ptr [ebp - 0x924]
            //   8985a8f0ffff         | mov                 dword ptr [ebp - 0xf58], eax
            //   898dacf0ffff         | mov                 dword ptr [ebp - 0xf54], ecx
            //   c785d8f6ffff0a664eff     | mov    dword ptr [ebp - 0x928], 0xff4e660a

        $sequence_5 = { e9???????? 8d8df0feffff e9???????? 8d8d68faffff e9???????? 8d8d38faffff e9???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8d8df0feffff         | lea                 ecx, [ebp - 0x110]
            //   e9????????           |                     
            //   8d8d68faffff         | lea                 ecx, [ebp - 0x598]
            //   e9????????           |                     
            //   8d8d38faffff         | lea                 ecx, [ebp - 0x5c8]
            //   e9????????           |                     

        $sequence_6 = { 668908 c645bc01 eb57 807dbc00 7451 8b4db8 83f908 }
            // n = 7, score = 100
            //   668908               | mov                 word ptr [eax], cx
            //   c645bc01             | mov                 byte ptr [ebp - 0x44], 1
            //   eb57                 | jmp                 0x59
            //   807dbc00             | cmp                 byte ptr [ebp - 0x44], 0
            //   7451                 | je                  0x53
            //   8b4db8               | mov                 ecx, dword ptr [ebp - 0x48]
            //   83f908               | cmp                 ecx, 8

        $sequence_7 = { 75f9 2bca 8d85b0f4ffff 51 50 8d8d54eeffff e8???????? }
            // n = 7, score = 100
            //   75f9                 | jne                 0xfffffffb
            //   2bca                 | sub                 ecx, edx
            //   8d85b0f4ffff         | lea                 eax, [ebp - 0xb50]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   8d8d54eeffff         | lea                 ecx, [ebp - 0x11ac]
            //   e8????????           |                     

        $sequence_8 = { 898560edffff 898d64edffff c785d8e4ffffdc70e11a c785dce4fffff74b9182 8b85d8e4ffff 8b8ddce4ffff 898568edffff }
            // n = 7, score = 100
            //   898560edffff         | mov                 dword ptr [ebp - 0x12a0], eax
            //   898d64edffff         | mov                 dword ptr [ebp - 0x129c], ecx
            //   c785d8e4ffffdc70e11a     | mov    dword ptr [ebp - 0x1b28], 0x1ae170dc
            //   c785dce4fffff74b9182     | mov    dword ptr [ebp - 0x1b24], 0x82914bf7
            //   8b85d8e4ffff         | mov                 eax, dword ptr [ebp - 0x1b28]
            //   8b8ddce4ffff         | mov                 ecx, dword ptr [ebp - 0x1b24]
            //   898568edffff         | mov                 dword ptr [ebp - 0x1298], eax

        $sequence_9 = { e9???????? 807e0800 8b0f 8b01 8b4004 740e 6a04 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   807e0800             | cmp                 byte ptr [esi + 8], 0
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   740e                 | je                  0x10
            //   6a04                 | push                4

    condition:
        7 of them and filesize < 1433600
}