rule win_getmail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { c744243801000000 8b44241c 889c2450040000 50 8b08 8d442428 51 }
            // n = 7, score = 100
            //   c744243801000000     | mov                 dword ptr [esp + 0x38], 1
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   889c2450040000       | mov                 byte ptr [esp + 0x450], bl
            //   50                   | push                eax
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8d442428             | lea                 eax, [esp + 0x28]
            //   51                   | push                ecx

        $sequence_1 = { 5e 5d 5b 83c460 c3 49 51 }
            // n = 7, score = 100
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   83c460               | add                 esp, 0x60
            //   c3                   | ret                 
            //   49                   | dec                 ecx
            //   51                   | push                ecx

        $sequence_2 = { 50 56 ff5238 8b44241c 85c0 7409 8b0e }
            // n = 7, score = 100
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff5238               | call                dword ptr [edx + 0x38]
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   85c0                 | test                eax, eax
            //   7409                 | je                  0xb
            //   8b0e                 | mov                 ecx, dword ptr [esi]

        $sequence_3 = { ba???????? 3bc3 7402 8bd0 8b4c2420 3bcb 7505 }
            // n = 7, score = 100
            //   ba????????           |                     
            //   3bc3                 | cmp                 eax, ebx
            //   7402                 | je                  4
            //   8bd0                 | mov                 edx, eax
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]
            //   3bcb                 | cmp                 ecx, ebx
            //   7505                 | jne                 7

        $sequence_4 = { 8b15???????? 89442420 894c2424 89542428 eb07 8d44241c 50 }
            // n = 7, score = 100
            //   8b15????????         |                     
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   894c2424             | mov                 dword ptr [esp + 0x24], ecx
            //   89542428             | mov                 dword ptr [esp + 0x28], edx
            //   eb07                 | jmp                 9
            //   8d44241c             | lea                 eax, [esp + 0x1c]
            //   50                   | push                eax

        $sequence_5 = { bf???????? 88442430 83c9ff 33c0 6a01 f2ae }
            // n = 6, score = 100
            //   bf????????           |                     
            //   88442430             | mov                 byte ptr [esp + 0x30], al
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax
            //   6a01                 | push                1
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]

        $sequence_6 = { 895904 895908 89590c a1???????? 8d542444 50 }
            // n = 6, score = 100
            //   895904               | mov                 dword ptr [ecx + 4], ebx
            //   895908               | mov                 dword ptr [ecx + 8], ebx
            //   89590c               | mov                 dword ptr [ecx + 0xc], ebx
            //   a1????????           |                     
            //   8d542444             | lea                 edx, [esp + 0x44]
            //   50                   | push                eax

        $sequence_7 = { 52 c784249800000003000000 c784249c0000001e000130 c78424a00000001e000330 c78424a40000000300150c }
            // n = 5, score = 100
            //   52                   | push                edx
            //   c784249800000003000000     | mov    dword ptr [esp + 0x98], 3
            //   c784249c0000001e000130     | mov    dword ptr [esp + 0x9c], 0x3001001e
            //   c78424a00000001e000330     | mov    dword ptr [esp + 0xa0], 0x3003001e
            //   c78424a40000000300150c     | mov    dword ptr [esp + 0xa4], 0xc150003

        $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 = { 83c404 8b8c24d8000000 3bcb 7449 8a41ff 84c0 740b }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   8b8c24d8000000       | mov                 ecx, dword ptr [esp + 0xd8]
            //   3bcb                 | cmp                 ecx, ebx
            //   7449                 | je                  0x4b
            //   8a41ff               | mov                 al, byte ptr [ecx - 1]
            //   84c0                 | test                al, al
            //   740b                 | je                  0xd

    condition:
        7 of them and filesize < 188416
}