rule win_fishmaster_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.fishmaster."
        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.fishmaster"
        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 = { 4c8bcb 49c7c0ffffffff 48c744242000000000 488bd7 488b08 4883c901 ff15???????? }
            // n = 7, score = 100
            //   4c8bcb               | cmp                 esi, 0x10
            //   49c7c0ffffffff       | dec                 eax
            //   48c744242000000000     | mov    ecx, eax
            //   488bd7               | dec                 eax
            //   488b08               | test                eax, eax
            //   4883c901             | je                  0x1ab
            //   ff15????????         |                     

        $sequence_1 = { 448b7f10 48897310 48c743180f000000 408833 4533c0 488d15d5300000 }
            // n = 6, score = 100
            //   448b7f10             | movups              xmmword ptr [esp + 0x70], xmm0
            //   48897310             | dec                 eax
            //   48c743180f000000     | mov                 dword ptr [ebp - 0x78], 0xf
            //   408833               | jmp                 0x9d
            //   4533c0               | dec                 ecx
            //   488d15d5300000       | mov                 ebx, esi

        $sequence_2 = { 8bbc2498000000 4180f82f 410f44fa c1ff04 c0e202 }
            // n = 5, score = 100
            //   8bbc2498000000       | jb                  0x7ad
            //   4180f82f             | dec                 eax
            //   410f44fa             | mov                 dword ptr [esp + 0x40], edi
            //   c1ff04               | dec                 esp
            //   c0e202               | mov                 dword ptr [esp + 0x48], esp

        $sequence_3 = { ff15???????? 4533f6 4489742420 4533c9 4533c0 418d5601 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   4533f6               | dec                 eax
            //   4489742420           | cmovae              edx, dword ptr [esp + 0x40]
            //   4533c9               | dec                 eax
            //   4533c0               | lea                 ecx, [esp + 0x40]
            //   418d5601             | dec                 eax

        $sequence_4 = { 48837f1810 7203 488b07 488d4c2438 4983fe10 }
            // n = 5, score = 100
            //   48837f1810           | mov                 eax, 0x3f
            //   7203                 | cmp                 al, 0x19
            //   488b07               | ja                  0x1a1
            //   488d4c2438           | inc                 esp
            //   4983fe10             | lea                 esp, [ecx - 0x41]

        $sequence_5 = { eb26 ff15???????? cc 488bd6 e8???????? }
            // n = 5, score = 100
            //   eb26                 | jne                 0x91
            //   ff15????????         |                     
            //   cc                   | mov                 edx, edi
            //   488bd6               | jmp                 0x9f
            //   e8????????           |                     

        $sequence_6 = { 488d0d922c0000 e8???????? 85c0 742e 32c0 eb33 }
            // n = 6, score = 100
            //   488d0d922c0000       | cmove               eax, edx
            //   e8????????           |                     
            //   85c0                 | inc                 esp
            //   742e                 | mov                 esp, edi
            //   32c0                 | jmp                 0x776
            //   eb33                 | cmp                 cl, 0x2f

        $sequence_7 = { 4883ec18 4c8bc1 b84d5a0000 6639051dcbffff }
            // n = 4, score = 100
            //   4883ec18             | dec                 eax
            //   4c8bc1               | add                 eax, 0x27
            //   b84d5a0000           | dec                 eax
            //   6639051dcbffff       | and                 eax, 0xffffffe0

        $sequence_8 = { 42880409 488d542440 48837c245810 480f43542440 488d4c2440 }
            // n = 5, score = 100
            //   42880409             | dec                 ebp
            //   488d542440           | mov                 eax, esi
            //   48837c245810         | dec                 esp
            //   480f43542440         | mov                 dword ptr [esi + 0x10], edi
            //   488d4c2440           | dec                 esi

        $sequence_9 = { 8d71b9 eb1c 8d41d0 3c09 }
            // n = 4, score = 100
            //   8d71b9               | jl                  0x96
            //   eb1c                 | dec                 eax
            //   8d41d0               | lea                 eax, [ebp + 0x80]
            //   3c09                 | dec                 eax

    condition:
        7 of them and filesize < 812032
}