rule win_flowershop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.flowershop."
        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.flowershop"
        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 = { 83f8ff 7437 ff35???????? ff15???????? 85c0 7427 8935???????? }
            // n = 7, score = 500
            //   83f8ff               | cmp                 eax, -1
            //   7437                 | je                  0x39
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7427                 | je                  0x29
            //   8935????????         |                     

        $sequence_1 = { ff15???????? 8bf0 85f6 7429 ff7514 8b450c 83660800 }
            // n = 7, score = 500
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7429                 | je                  0x2b
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   83660800             | and                 dword ptr [esi + 8], 0

        $sequence_2 = { 8b45f4 a3???????? 8b4508 3b45f0 74e0 8945f0 6a08 }
            // n = 7, score = 500
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   a3????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   3b45f0               | cmp                 eax, dword ptr [ebp - 0x10]
            //   74e0                 | je                  0xffffffe2
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   6a08                 | push                8

        $sequence_3 = { 7459 56 e8???????? 663dac3f 59 66a3???????? 7209 }
            // n = 7, score = 500
            //   7459                 | je                  0x5b
            //   56                   | push                esi
            //   e8????????           |                     
            //   663dac3f             | cmp                 ax, 0x3fac
            //   59                   | pop                 ecx
            //   66a3????????         |                     
            //   7209                 | jb                  0xb

        $sequence_4 = { 89510c c3 a1???????? 53 56 b9fc070000 668b30 }
            // n = 7, score = 500
            //   89510c               | mov                 dword ptr [ecx + 0xc], edx
            //   c3                   | ret                 
            //   a1????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   b9fc070000           | mov                 ecx, 0x7fc
            //   668b30               | mov                 si, word ptr [eax]

        $sequence_5 = { 894624 33c9 85c0 0f95c1 8bc1 5f 5e }
            // n = 7, score = 500
            //   894624               | mov                 dword ptr [esi + 0x24], eax
            //   33c9                 | xor                 ecx, ecx
            //   85c0                 | test                eax, eax
            //   0f95c1               | setne               cl
            //   8bc1                 | mov                 eax, ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_6 = { be???????? 8b0e 8bc1 d1e8 83e003 83e800 0f84a8000000 }
            // n = 7, score = 500
            //   be????????           |                     
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   8bc1                 | mov                 eax, ecx
            //   d1e8                 | shr                 eax, 1
            //   83e003               | and                 eax, 3
            //   83e800               | sub                 eax, 0
            //   0f84a8000000         | je                  0xae

        $sequence_7 = { ebcc 53 56 8b74240c 33db 85f6 57 }
            // n = 7, score = 500
            //   ebcc                 | jmp                 0xffffffce
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8b74240c             | mov                 esi, dword ptr [esp + 0xc]
            //   33db                 | xor                 ebx, ebx
            //   85f6                 | test                esi, esi
            //   57                   | push                edi

        $sequence_8 = { 33c0 3806 5e 0f95c0 c9 c3 8b442404 }
            // n = 7, score = 500
            //   33c0                 | xor                 eax, eax
            //   3806                 | cmp                 byte ptr [esi], al
            //   5e                   | pop                 esi
            //   0f95c0               | setne               al
            //   c9                   | leave               
            //   c3                   | ret                 
            //   8b442404             | mov                 eax, dword ptr [esp + 4]

        $sequence_9 = { 56 6a28 6a00 68???????? e8???????? 8b742414 6a0f }
            // n = 7, score = 500
            //   56                   | push                esi
            //   6a28                 | push                0x28
            //   6a00                 | push                0
            //   68????????           |                     
            //   e8????????           |                     
            //   8b742414             | mov                 esi, dword ptr [esp + 0x14]
            //   6a0f                 | push                0xf

    condition:
        7 of them and filesize < 829440
}