rule win_bundestrojaner_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.bundestrojaner."
        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.bundestrojaner"
        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 = { d94020 d86040 d95c2414 d9c0 d8c2 d95c2400 d9c9 }
            // n = 7, score = 100
            //   d94020               | fld                 dword ptr [eax + 0x20]
            //   d86040               | fsub                dword ptr [eax + 0x40]
            //   d95c2414             | fstp                dword ptr [esp + 0x14]
            //   d9c0                 | fld                 st(0)
            //   d8c2                 | fadd                st(2)
            //   d95c2400             | fstp                dword ptr [esp]
            //   d9c9                 | fxch                st(1)

        $sequence_1 = { 89463c e8???????? 6800010000 894640 e8???????? 894644 8b460c }
            // n = 7, score = 100
            //   89463c               | mov                 dword ptr [esi + 0x3c], eax
            //   e8????????           |                     
            //   6800010000           | push                0x100
            //   894640               | mov                 dword ptr [esi + 0x40], eax
            //   e8????????           |                     
            //   894644               | mov                 dword ptr [esi + 0x44], eax
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]

        $sequence_2 = { 7419 48 7455 8b06 56 c7401430000000 8b0e }
            // n = 7, score = 100
            //   7419                 | je                  0x1b
            //   48                   | dec                 eax
            //   7455                 | je                  0x57
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   56                   | push                esi
            //   c7401430000000       | mov                 dword ptr [eax + 0x14], 0x30
            //   8b0e                 | mov                 ecx, dword ptr [esi]

        $sequence_3 = { 51 e8???????? 89465c 8b5710 8d449004 894660 8b4e08 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   89465c               | mov                 dword ptr [esi + 0x5c], eax
            //   8b5710               | mov                 edx, dword ptr [edi + 0x10]
            //   8d449004             | lea                 eax, [eax + edx*4 + 4]
            //   894660               | mov                 dword ptr [esi + 0x60], eax
            //   8b4e08               | mov                 ecx, dword ptr [esi + 8]

        $sequence_4 = { 8b442470 8b4e18 50 8b464c 51 50 ff5214 }
            // n = 7, score = 100
            //   8b442470             | mov                 eax, dword ptr [esp + 0x70]
            //   8b4e18               | mov                 ecx, dword ptr [esi + 0x18]
            //   50                   | push                eax
            //   8b464c               | mov                 eax, dword ptr [esi + 0x4c]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   ff5214               | call                dword ptr [edx + 0x14]

        $sequence_5 = { 8b869c000000 51 52 50 8b4e30 51 e8???????? }
            // n = 7, score = 100
            //   8b869c000000         | mov                 eax, dword ptr [esi + 0x9c]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   50                   | push                eax
            //   8b4e30               | mov                 ecx, dword ptr [esi + 0x30]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_6 = { 8b4f18 8a5734 83c105 51 8d8c24c0000000 51 52 }
            // n = 7, score = 100
            //   8b4f18               | mov                 ecx, dword ptr [edi + 0x18]
            //   8a5734               | mov                 dl, byte ptr [edi + 0x34]
            //   83c105               | add                 ecx, 5
            //   51                   | push                ecx
            //   8d8c24c0000000       | lea                 ecx, [esp + 0xc0]
            //   51                   | push                ecx
            //   52                   | push                edx

        $sequence_7 = { 895040 895140 8b4604 8b4804 895940 }
            // n = 5, score = 100
            //   895040               | mov                 dword ptr [eax + 0x40], edx
            //   895140               | mov                 dword ptr [ecx + 0x40], edx
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   895940               | mov                 dword ptr [ecx + 0x40], ebx

        $sequence_8 = { 81ec1c010000 57 8bf9 6a10 c744240c04010000 e8???????? 83c404 }
            // n = 7, score = 100
            //   81ec1c010000         | sub                 esp, 0x11c
            //   57                   | push                edi
            //   8bf9                 | mov                 edi, ecx
            //   6a10                 | push                0x10
            //   c744240c04010000     | mov                 dword ptr [esp + 0xc], 0x104
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_9 = { 740d 51 ff15???????? c70600000000 33c9 5e 85c0 }
            // n = 7, score = 100
            //   740d                 | je                  0xf
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   c70600000000         | mov                 dword ptr [esi], 0
            //   33c9                 | xor                 ecx, ecx
            //   5e                   | pop                 esi
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 729088
}