rule win_dramnudge_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.dramnudge."
        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.dramnudge"
        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 = { 3db4000000 7d17 a3???????? ff75d8 68???????? e8???????? }
            // n = 6, score = 100
            //   3db4000000           | cmp                 eax, 0xb4
            //   7d17                 | jge                 0x19
            //   a3????????           |                     
            //   ff75d8               | push                dword ptr [ebp - 0x28]
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_1 = { 56 57 43 33c0 8bfb 83c9ff }
            // n = 6, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   43                   | inc                 ebx
            //   33c0                 | xor                 eax, eax
            //   8bfb                 | mov                 edi, ebx
            //   83c9ff               | or                  ecx, 0xffffffff

        $sequence_2 = { 89bd6cfeffff 8b4580 898568feffff 8b5598 899564feffff ffb56cfeffff ffb568feffff }
            // n = 7, score = 100
            //   89bd6cfeffff         | mov                 dword ptr [ebp - 0x194], edi
            //   8b4580               | mov                 eax, dword ptr [ebp - 0x80]
            //   898568feffff         | mov                 dword ptr [ebp - 0x198], eax
            //   8b5598               | mov                 edx, dword ptr [ebp - 0x68]
            //   899564feffff         | mov                 dword ptr [ebp - 0x19c], edx
            //   ffb56cfeffff         | push                dword ptr [ebp - 0x194]
            //   ffb568feffff         | push                dword ptr [ebp - 0x198]

        $sequence_3 = { e8???????? 83c40c 85ff 741a 57 8b5514 03551c }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85ff                 | test                edi, edi
            //   741a                 | je                  0x1c
            //   57                   | push                edi
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]
            //   03551c               | add                 edx, dword ptr [ebp + 0x1c]

        $sequence_4 = { 66c746106800 8b45ac 8b50f4 42 85d2 7e51 }
            // n = 6, score = 100
            //   66c746106800         | mov                 word ptr [esi + 0x10], 0x68
            //   8b45ac               | mov                 eax, dword ptr [ebp - 0x54]
            //   8b50f4               | mov                 edx, dword ptr [eax - 0xc]
            //   42                   | inc                 edx
            //   85d2                 | test                edx, edx
            //   7e51                 | jle                 0x53

        $sequence_5 = { e9???????? 6a02 6a00 8b4b24 51 53 e8???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   6a02                 | push                2
            //   6a00                 | push                0
            //   8b4b24               | mov                 ecx, dword ptr [ebx + 0x24]
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   e8????????           |                     

        $sequence_6 = { 891d???????? c74318f0030000 c6433001 8b07 a3???????? 8b55ac 64891500000000 }
            // n = 7, score = 100
            //   891d????????         |                     
            //   c74318f0030000       | mov                 dword ptr [ebx + 0x18], 0x3f0
            //   c6433001             | mov                 byte ptr [ebx + 0x30], 1
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   a3????????           |                     
            //   8b55ac               | mov                 edx, dword ptr [ebp - 0x54]
            //   64891500000000       | mov                 dword ptr fs:[0], edx

        $sequence_7 = { 33c9 894a40 6a04 e8???????? 59 8945fc 85c0 }
            // n = 7, score = 100
            //   33c9                 | xor                 ecx, ecx
            //   894a40               | mov                 dword ptr [edx + 0x40], ecx
            //   6a04                 | push                4
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   85c0                 | test                eax, eax

        $sequence_8 = { 83c408 eb27 6a02 53 }
            // n = 4, score = 100
            //   83c408               | add                 esp, 8
            //   eb27                 | jmp                 0x29
            //   6a02                 | push                2
            //   53                   | push                ebx

        $sequence_9 = { 53 56 57 8b7d10 8b750c 3bfe 7602 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   3bfe                 | cmp                 edi, esi
            //   7602                 | jbe                 4

    condition:
        7 of them and filesize < 1294336
}