rule win_getmail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.getmail."
        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.getmail"
        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 = { 5e b803000000 5b c3 50 e8???????? 8bf8 }
            // n = 7, score = 100
            //   5e                   | pop                 esi
            //   b803000000           | mov                 eax, 3
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_1 = { 8d542424 51 52 8d4c2420 894604 895e08 }
            // n = 6, score = 100
            //   8d542424             | lea                 edx, [esp + 0x24]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   8d4c2420             | lea                 ecx, [esp + 0x20]
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   895e08               | mov                 dword ptr [esi + 8], ebx

        $sequence_2 = { 8d4c2444 50 53 e8???????? 3bc3 7528 8b44245c }
            // n = 7, score = 100
            //   8d4c2444             | lea                 ecx, [esp + 0x44]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   3bc3                 | cmp                 eax, ebx
            //   7528                 | jne                 0x2a
            //   8b44245c             | mov                 eax, dword ptr [esp + 0x5c]

        $sequence_3 = { f3a6 7405 1bd2 83daff 85d2 755f }
            // n = 6, score = 100
            //   f3a6                 | repe cmpsb          byte ptr [esi], byte ptr es:[edi]
            //   7405                 | je                  7
            //   1bd2                 | sbb                 edx, edx
            //   83daff               | sbb                 edx, -1
            //   85d2                 | test                edx, edx
            //   755f                 | jne                 0x61

        $sequence_4 = { 8be9 8bc8 3bc5 7202 8bcd }
            // n = 5, score = 100
            //   8be9                 | mov                 ebp, ecx
            //   8bc8                 | mov                 ecx, eax
            //   3bc5                 | cmp                 eax, ebp
            //   7202                 | jb                  4
            //   8bcd                 | mov                 ecx, ebp

        $sequence_5 = { 88442458 53 e8???????? 8b442434 899c2434020000 397010 }
            // n = 6, score = 100
            //   88442458             | mov                 byte ptr [esp + 0x58], al
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8b442434             | mov                 eax, dword ptr [esp + 0x34]
            //   899c2434020000       | mov                 dword ptr [esp + 0x234], ebx
            //   397010               | cmp                 dword ptr [eax + 0x10], esi

        $sequence_6 = { 8b4108 f6c408 7514 8b442434 8178300b001f0e 7509 6683783800 }
            // n = 7, score = 100
            //   8b4108               | mov                 eax, dword ptr [ecx + 8]
            //   f6c408               | test                ah, 8
            //   7514                 | jne                 0x16
            //   8b442434             | mov                 eax, dword ptr [esp + 0x34]
            //   8178300b001f0e       | cmp                 dword ptr [eax + 0x30], 0xe1f000b
            //   7509                 | jne                 0xb
            //   6683783800           | cmp                 word ptr [eax + 0x38], 0

        $sequence_7 = { e8???????? 84c0 742c 8b4c244c 8b542448 8d3c0a 8bce }
            // n = 7, score = 100
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   742c                 | je                  0x2e
            //   8b4c244c             | mov                 ecx, dword ptr [esp + 0x4c]
            //   8b542448             | mov                 edx, dword ptr [esp + 0x48]
            //   8d3c0a               | lea                 edi, [edx + ecx]
            //   8bce                 | mov                 ecx, esi

        $sequence_8 = { 8b44241c 89742434 89742438 8b11 8974243c 8b742418 40 }
            // n = 7, score = 100
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   89742434             | mov                 dword ptr [esp + 0x34], esi
            //   89742438             | mov                 dword ptr [esp + 0x38], esi
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   8974243c             | mov                 dword ptr [esp + 0x3c], esi
            //   8b742418             | mov                 esi, dword ptr [esp + 0x18]
            //   40                   | inc                 eax

        $sequence_9 = { c78424d0000000ffffffff e8???????? 8b8c24c4000000 5f 5e 5b }
            // n = 6, score = 100
            //   c78424d0000000ffffffff     | mov    dword ptr [esp + 0xd0], 0xffffffff
            //   e8????????           |                     
            //   8b8c24c4000000       | mov                 ecx, dword ptr [esp + 0xc4]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

    condition:
        7 of them and filesize < 188416
}