rule win_dairy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.dairy."
        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.dairy"
        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 = { 83c41c f2ae f7d1 49 880431 8d442410 }
            // n = 6, score = 100
            //   83c41c               | add                 esp, 0x1c
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   880431               | mov                 byte ptr [ecx + esi], al
            //   8d442410             | lea                 eax, [esp + 0x10]

        $sequence_1 = { 68???????? 6a00 890d???????? 8b0d???????? 6a02 }
            // n = 5, score = 100
            //   68????????           |                     
            //   6a00                 | push                0
            //   890d????????         |                     
            //   8b0d????????         |                     
            //   6a02                 | push                2

        $sequence_2 = { 8b74241c 46 4f 84c0 }
            // n = 4, score = 100
            //   8b74241c             | mov                 esi, dword ptr [esp + 0x1c]
            //   46                   | inc                 esi
            //   4f                   | dec                 edi
            //   84c0                 | test                al, al

        $sequence_3 = { 89442424 894c2428 c744241840000000 ffd7 8b35???????? }
            // n = 5, score = 100
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   894c2428             | mov                 dword ptr [esp + 0x28], ecx
            //   c744241840000000     | mov                 dword ptr [esp + 0x18], 0x40
            //   ffd7                 | call                edi
            //   8b35????????         |                     

        $sequence_4 = { 8b4c2410 8b450c 8d54241c 51 52 }
            // n = 5, score = 100
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8d54241c             | lea                 edx, [esp + 0x1c]
            //   51                   | push                ecx
            //   52                   | push                edx

        $sequence_5 = { 50 ffd5 8bf0 85f6 746f 8b4e10 8b11 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ffd5                 | call                ebp
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   746f                 | je                  0x71
            //   8b4e10               | mov                 ecx, dword ptr [esi + 0x10]
            //   8b11                 | mov                 edx, dword ptr [ecx]

        $sequence_6 = { ba27000000 2bd1 bf???????? 83c9ff 33c0 }
            // n = 5, score = 100
            //   ba27000000           | mov                 edx, 0x27
            //   2bd1                 | sub                 edx, ecx
            //   bf????????           |                     
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax

        $sequence_7 = { eb2b 8dbc0c3d060000 83c9ff 33c0 }
            // n = 4, score = 100
            //   eb2b                 | jmp                 0x2d
            //   8dbc0c3d060000       | lea                 edi, [esp + ecx + 0x63d]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax

        $sequence_8 = { bf???????? 33c0 8d54243c f2ae f7d1 2bf9 6a0a }
            // n = 7, score = 100
            //   bf????????           |                     
            //   33c0                 | xor                 eax, eax
            //   8d54243c             | lea                 edx, [esp + 0x3c]
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx
            //   6a0a                 | push                0xa

        $sequence_9 = { 83c9ff 33c0 46 83c502 }
            // n = 4, score = 100
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax
            //   46                   | inc                 esi
            //   83c502               | add                 ebp, 2

    condition:
        7 of them and filesize < 212992
}