rule win_farseer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.farseer."
        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.farseer"
        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 = { 8d4c2430 750f 68???????? e8???????? e9???????? }
            // n = 5, score = 100
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   750f                 | jne                 0x11
            //   68????????           |                     
            //   e8????????           |                     
            //   e9????????           |                     

        $sequence_1 = { 8d4c2428 51 c78424a000000000000000 e8???????? 68???????? 8d542428 52 }
            // n = 7, score = 100
            //   8d4c2428             | lea                 ecx, [esp + 0x28]
            //   51                   | push                ecx
            //   c78424a000000000000000     | mov    dword ptr [esp + 0xa0], 0
            //   e8????????           |                     
            //   68????????           |                     
            //   8d542428             | lea                 edx, [esp + 0x28]
            //   52                   | push                edx

        $sequence_2 = { 8d942444030000 6a00 52 89742424 e8???????? 83c40c }
            // n = 6, score = 100
            //   8d942444030000       | lea                 edx, [esp + 0x344]
            //   6a00                 | push                0
            //   52                   | push                edx
            //   89742424             | mov                 dword ptr [esp + 0x24], esi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_3 = { e8???????? e9???????? 83f801 752b 8d4c2430 38842466010000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   e9????????           |                     
            //   83f801               | cmp                 eax, 1
            //   752b                 | jne                 0x2d
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   38842466010000       | cmp                 byte ptr [esp + 0x166], al

        $sequence_4 = { 59 5f 5e 5d 5b 8b8c24b8020000 }
            // n = 6, score = 100
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   8b8c24b8020000       | mov                 ecx, dword ptr [esp + 0x2b8]

        $sequence_5 = { 6803010000 8d8c240d090000 6a00 51 }
            // n = 4, score = 100
            //   6803010000           | push                0x103
            //   8d8c240d090000       | lea                 ecx, [esp + 0x90d]
            //   6a00                 | push                0
            //   51                   | push                ecx

        $sequence_6 = { 6bc930 8975e0 8db1104d4200 8975e4 eb2a 8a4601 }
            // n = 6, score = 100
            //   6bc930               | imul                ecx, ecx, 0x30
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   8db1104d4200         | lea                 esi, [ecx + 0x424d10]
            //   8975e4               | mov                 dword ptr [ebp - 0x1c], esi
            //   eb2a                 | jmp                 0x2c
            //   8a4601               | mov                 al, byte ptr [esi + 1]

        $sequence_7 = { 6aff 53 50 8d4c243c c684248001000001 e8???????? }
            // n = 6, score = 100
            //   6aff                 | push                -1
            //   53                   | push                ebx
            //   50                   | push                eax
            //   8d4c243c             | lea                 ecx, [esp + 0x3c]
            //   c684248001000001     | mov                 byte ptr [esp + 0x180], 1
            //   e8????????           |                     

        $sequence_8 = { 837c241400 74bf 8b542418 6a00 8d4c2418 51 57 }
            // n = 7, score = 100
            //   837c241400           | cmp                 dword ptr [esp + 0x14], 0
            //   74bf                 | je                  0xffffffc1
            //   8b542418             | mov                 edx, dword ptr [esp + 0x18]
            //   6a00                 | push                0
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   51                   | push                ecx
            //   57                   | push                edi

        $sequence_9 = { 8bda c1eb1f 03da 8b7e10 8bcf 2b4e0c }
            // n = 6, score = 100
            //   8bda                 | mov                 ebx, edx
            //   c1eb1f               | shr                 ebx, 0x1f
            //   03da                 | add                 ebx, edx
            //   8b7e10               | mov                 edi, dword ptr [esi + 0x10]
            //   8bcf                 | mov                 ecx, edi
            //   2b4e0c               | sub                 ecx, dword ptr [esi + 0xc]

    condition:
        7 of them and filesize < 347328
}