rule win_misfox_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.misfox."
        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.misfox"
        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 = { ddd8 db2d???????? b801000000 833d????????00 0f8536510000 }
            // n = 5, score = 300
            //   ddd8                 | mov                 eax, dword ptr [esi + edi*8]
            //   db2d????????         |                     
            //   b801000000           | dec                 eax
            //   833d????????00       |                     
            //   0f8536510000         | mov                 eax, ebx

        $sequence_1 = { 8bf7 8906 8d7604 40 3d00010000 7cf3 c745fc00000000 }
            // n = 7, score = 300
            //   8bf7                 | mov                 eax, dword ptr [ecx*4 + 0x10004108]
            //   8906                 | ret                 
            //   8d7604               | mov                 eax, ecx
            //   40                   | test                esi, esi
            //   3d00010000           | je                  0x1e
            //   7cf3                 | fstp                st(0)
            //   c745fc00000000       | mov                 eax, 1

        $sequence_2 = { 8d44241c 50 6a01 8d442420 50 8d442440 50 }
            // n = 7, score = 300
            //   8d44241c             | jns                 0x13
            //   50                   | dec                 esp
            //   6a01                 | lea                 ecx, [0xe20b]
            //   8d442420             | sub                 ecx, 8
            //   50                   | lea                 esi, [esi + 8]
            //   8d442440             | movq                qword ptr [edi], xmm1
            //   50                   | lea                 edi, [edi + 8]

        $sequence_3 = { 8b0c8550870110 8b8524e5ffff f644080480 0f8475030000 8b9530e5ffff 33ff 89bd34e5ffff }
            // n = 7, score = 300
            //   8b0c8550870110       | jne                 0x5141
            //   8b8524e5ffff         | jg                  0xc
            //   f644080480           | mov                 eax, 0xa
            //   0f8475030000         | pop                 esi
            //   8b9530e5ffff         | mov                 esp, ebp
            //   33ff                 | pop                 ebp
            //   89bd34e5ffff         | ret                 

        $sequence_4 = { c3 8bc1 85f6 7409 }
            // n = 4, score = 300
            //   c3                   | and                 eax, 0x1f
            //   8bc1                 | dec                 eax
            //   85f6                 | imul                esi, eax, 0x58
            //   7409                 | dec                 ecx

        $sequence_5 = { 7f0a b80a000000 5e 8be5 5d c3 53 }
            // n = 7, score = 300
            //   7f0a                 | dec                 eax
            //   b80a000000           | mov                 ebx, dword ptr [esp + 0x30]
            //   5e                   | dec                 eax
            //   8be5                 | add                 esp, 0x20
            //   5d                   | pop                 edi
            //   c3                   | ret                 
            //   53                   | dec                 eax

        $sequence_6 = { ff74241c ffd6 85c0 7560 8b3d???????? }
            // n = 5, score = 300
            //   ff74241c             | lea                 ecx, [0x16f4c]
            //   ffd6                 | je                  0x375
            //   85c0                 | inc                 ebp
            //   7560                 | test                edx, edx
            //   8b3d????????         |                     

        $sequence_7 = { 83e908 8d7608 660fd60f 8d7f08 8b048d08410010 }
            // n = 5, score = 300
            //   83e908               | mov                 edi, ebx
            //   8d7608               | dec                 eax
            //   660fd60f             | sar                 edi, 5
            //   8d7f08               | dec                 esp
            //   8b048d08410010       | lea                 esi, [0xd226]

        $sequence_8 = { 488d4dff ba00020000 c745cb00020000 448975c7 }
            // n = 4, score = 100
            //   488d4dff             | mov                 eax, dword ptr [ebp]
            //   ba00020000           | jmp                 0x17
            //   c745cb00020000       | inc                 ecx
            //   448975c7             | cmp                 eax, esp

        $sequence_9 = { e8???????? 8b430c 4c8d6708 894308 8b470c }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8b430c               | mov                 eax, dword ptr [ebx + 0xc]
            //   4c8d6708             | dec                 esp
            //   894308               | lea                 esp, [edi + 8]
            //   8b470c               | mov                 dword ptr [ebx + 8], eax

        $sequence_10 = { 488bc3 488b5c2430 4883c420 5f c3 488d0d4c6f0100 }
            // n = 6, score = 100
            //   488bc3               | mov                 edx, 0x800
            //   488b5c2430           | lea                 eax, [ecx - 6]
            //   4883c420             | cmp                 eax, 1
            //   5f                   | ja                  0x76
            //   c3                   | dec                 eax
            //   488d0d4c6f0100       | mov                 ecx, dword ptr [ebp - 0x41]

        $sequence_11 = { 48837d0810 4c0f434df0 488d4d10 48837d2810 480f434d10 8b4500 }
            // n = 6, score = 100
            //   48837d0810           | mov                 eax, dword ptr [edi + 0xc]
            //   4c0f434df0           | dec                 eax
            //   488d4d10             | cmp                 dword ptr [ebp + 8], 0x10
            //   48837d2810           | dec                 esp
            //   480f434d10           | cmovae              ecx, dword ptr [ebp - 0x10]
            //   8b4500               | dec                 eax

        $sequence_12 = { eb15 413bc4 753e 0fb65530 0fb64531 }
            // n = 5, score = 100
            //   eb15                 | lea                 ecx, [ebp + 0x10]
            //   413bc4               | dec                 eax
            //   753e                 | cmp                 dword ptr [ebp + 0x28], 0x10
            //   0fb65530             | dec                 eax
            //   0fb64531             | cmovae              ecx, dword ptr [ebp + 0x10]

        $sequence_13 = { 8d41fa 83f801 7774 488b4dbf ff15???????? 83f826 }
            // n = 6, score = 100
            //   8d41fa               | mov                 edx, 0x200
            //   83f801               | mov                 dword ptr [ebp - 0x35], 0x200
            //   7774                 | inc                 esp
            //   488b4dbf             | mov                 dword ptr [ebp - 0x39], esi
            //   ff15????????         |                     
            //   83f826               | dec                 eax

        $sequence_14 = { 488bc3 488bfb 48c1ff05 4c8d3526d20000 83e01f 486bf058 498b04fe }
            // n = 7, score = 100
            //   488bc3               | xor                 eax, esp
            //   488bfb               | dec                 eax
            //   48c1ff05             | mov                 dword ptr [ebp + 0x47], eax
            //   4c8d3526d20000       | dec                 eax
            //   83e01f               | lea                 ecx, [0x15f61]
            //   486bf058             | dec                 eax
            //   498b04fe             | lea                 ecx, [ebp - 0x11]

        $sequence_15 = { 4833c4 48894547 488d0d615f0100 ff15???????? 488d4def ba00080000 }
            // n = 6, score = 100
            //   4833c4               | jne                 0x40
            //   48894547             | movzx               edx, byte ptr [ebp + 0x30]
            //   488d0d615f0100       | movzx               eax, byte ptr [ebp + 0x31]
            //   ff15????????         |                     
            //   488d4def             | dec                 eax
            //   ba00080000           | lea                 ecx, [ebp - 1]

    condition:
        7 of them and filesize < 266240
}