rule win_eyservice_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.eyservice."
        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.eyservice"
        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 = { 0fb692bc844000 ff2495a8844000 56 e8???????? 894610 8b442418 83782400 }
            // n = 7, score = 100
            //   0fb692bc844000       | movzx               edx, byte ptr [edx + 0x4084bc]
            //   ff2495a8844000       | jmp                 dword ptr [edx*4 + 0x4084a8]
            //   56                   | push                esi
            //   e8????????           |                     
            //   894610               | mov                 dword ptr [esi + 0x10], eax
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   83782400             | cmp                 dword ptr [eax + 0x24], 0

        $sequence_1 = { 50 6a00 68???????? 51 896c2430 895c2438 ffd7 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   6a00                 | push                0
            //   68????????           |                     
            //   51                   | push                ecx
            //   896c2430             | mov                 dword ptr [esp + 0x30], ebp
            //   895c2438             | mov                 dword ptr [esp + 0x38], ebx
            //   ffd7                 | call                edi

        $sequence_2 = { 8b8ea0000000 57 68cb000000 6a01 51 ffd0 5f }
            // n = 7, score = 100
            //   8b8ea0000000         | mov                 ecx, dword ptr [esi + 0xa0]
            //   57                   | push                edi
            //   68cb000000           | push                0xcb
            //   6a01                 | push                1
            //   51                   | push                ecx
            //   ffd0                 | call                eax
            //   5f                   | pop                 edi

        $sequence_3 = { 6a01 51 ffd6 57 6a01 6a01 68???????? }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   57                   | push                edi
            //   6a01                 | push                1
            //   6a01                 | push                1
            //   68????????           |                     

        $sequence_4 = { 85c0 7511 55 ff15???????? 5e b80c000000 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   7511                 | jne                 0x13
            //   55                   | push                ebp
            //   ff15????????         |                     
            //   5e                   | pop                 esi
            //   b80c000000           | mov                 eax, 0xc

        $sequence_5 = { 8d442424 50 6802000080 ff15???????? 85c0 }
            // n = 5, score = 100
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   50                   | push                eax
            //   6802000080           | push                0x80000002
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_6 = { 51 e8???????? 85c0 8b44241c 74d0 85c0 7407 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   74d0                 | je                  0xffffffd2
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9

        $sequence_7 = { 8d4c2408 c7842460080000ffffffff e8???????? 33c0 eb40 8d84244c060000 50 }
            // n = 7, score = 100
            //   8d4c2408             | lea                 ecx, [esp + 8]
            //   c7842460080000ffffffff     | mov    dword ptr [esp + 0x860], 0xffffffff
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   eb40                 | jmp                 0x42
            //   8d84244c060000       | lea                 eax, [esp + 0x64c]
            //   50                   | push                eax

        $sequence_8 = { 5d 83c8ff 5b 59 c20400 8b7c2418 57 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   83c8ff               | or                  eax, 0xffffffff
            //   5b                   | pop                 ebx
            //   59                   | pop                 ecx
            //   c20400               | ret                 4
            //   8b7c2418             | mov                 edi, dword ptr [esp + 0x18]
            //   57                   | push                edi

        $sequence_9 = { c20400 83f802 751e bf???????? bee8660000 e9???????? bf???????? }
            // n = 7, score = 100
            //   c20400               | ret                 4
            //   83f802               | cmp                 eax, 2
            //   751e                 | jne                 0x20
            //   bf????????           |                     
            //   bee8660000           | mov                 esi, 0x66e8
            //   e9????????           |                     
            //   bf????????           |                     

    condition:
        7 of them and filesize < 452608
}