rule win_farseer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 0f85ac000000 83bc24fc02000010 0f8206020000 8b9424e8020000 52 e9???????? 8bd8 }
            // n = 7, score = 100
            //   0f85ac000000         | jne                 0xb2
            //   83bc24fc02000010     | cmp                 dword ptr [esp + 0x2fc], 0x10
            //   0f8206020000         | jb                  0x20c
            //   8b9424e8020000       | mov                 edx, dword ptr [esp + 0x2e8]
            //   52                   | push                edx
            //   e9????????           |                     
            //   8bd8                 | mov                 ebx, eax

        $sequence_1 = { 0f8e60010000 8d7c2458 e8???????? 56 33c9 8d74243c 8d942490000000 }
            // n = 7, score = 100
            //   0f8e60010000         | jle                 0x166
            //   8d7c2458             | lea                 edi, [esp + 0x58]
            //   e8????????           |                     
            //   56                   | push                esi
            //   33c9                 | xor                 ecx, ecx
            //   8d74243c             | lea                 esi, [esp + 0x3c]
            //   8d942490000000       | lea                 edx, [esp + 0x90]

        $sequence_2 = { 53 50 889c2428030000 e8???????? 83c40c 6804010000 8d8c2420030000 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   50                   | push                eax
            //   889c2428030000       | mov                 byte ptr [esp + 0x328], bl
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6804010000           | push                0x104
            //   8d8c2420030000       | lea                 ecx, [esp + 0x320]

        $sequence_3 = { a1???????? 8d0c90 890d???????? b8???????? 5f }
            // n = 5, score = 100
            //   a1????????           |                     
            //   8d0c90               | lea                 ecx, [eax + edx*4]
            //   890d????????         |                     
            //   b8????????           |                     
            //   5f                   | pop                 edi

        $sequence_4 = { 83c404 8b44246c 33ff 85c0 0f86f9000000 b308 8d6f10 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   8b44246c             | mov                 eax, dword ptr [esp + 0x6c]
            //   33ff                 | xor                 edi, edi
            //   85c0                 | test                eax, eax
            //   0f86f9000000         | jbe                 0xff
            //   b308                 | mov                 bl, 8
            //   8d6f10               | lea                 ebp, [edi + 0x10]

        $sequence_5 = { 52 e8???????? 83c408 89442418 3bc5 0f850a020000 68c8000000 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   3bc5                 | cmp                 eax, ebp
            //   0f850a020000         | jne                 0x210
            //   68c8000000           | push                0xc8

        $sequence_6 = { 83f801 752b 8d4c2430 38842466010000 750f }
            // n = 5, score = 100
            //   83f801               | cmp                 eax, 1
            //   752b                 | jne                 0x2d
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   38842466010000       | cmp                 byte ptr [esp + 0x166], al
            //   750f                 | jne                 0x11

        $sequence_7 = { 59 8945e0 85c0 7461 8d0cbd20634200 8901 8305????????20 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   85c0                 | test                eax, eax
            //   7461                 | je                  0x63
            //   8d0cbd20634200       | lea                 ecx, [edi*4 + 0x426320]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8305????????20       |                     

        $sequence_8 = { 8b9424cc000000 52 e8???????? 83c404 89bc24e0000000 89ac24dc000000 c68424cc00000000 }
            // n = 7, score = 100
            //   8b9424cc000000       | mov                 edx, dword ptr [esp + 0xcc]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   89bc24e0000000       | mov                 dword ptr [esp + 0xe0], edi
            //   89ac24dc000000       | mov                 dword ptr [esp + 0xdc], ebp
            //   c68424cc00000000     | mov                 byte ptr [esp + 0xcc], 0

        $sequence_9 = { 3d00010000 7d10 8a8c181d010000 8888f84b4200 40 ebe6 }
            // n = 6, score = 100
            //   3d00010000           | cmp                 eax, 0x100
            //   7d10                 | jge                 0x12
            //   8a8c181d010000       | mov                 cl, byte ptr [eax + ebx + 0x11d]
            //   8888f84b4200         | mov                 byte ptr [eax + 0x424bf8], cl
            //   40                   | inc                 eax
            //   ebe6                 | jmp                 0xffffffe8

    condition:
        7 of them and filesize < 347328
}