rule win_flowershop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 8975f4 7432 3b1d???????? 7631 56 56 56 }
            // n = 7, score = 500
            //   8975f4               | mov                 dword ptr [ebp - 0xc], esi
            //   7432                 | je                  0x34
            //   3b1d????????         |                     
            //   7631                 | jbe                 0x33
            //   56                   | push                esi
            //   56                   | push                esi
            //   56                   | push                esi

        $sequence_1 = { 56 57 6a34 6a00 68???????? e8???????? 8b7d08 }
            // n = 7, score = 500
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a34                 | push                0x34
            //   6a00                 | push                0
            //   68????????           |                     
            //   e8????????           |                     
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

        $sequence_2 = { eb33 53 33db 3bc6 7305 6afb }
            // n = 6, score = 500
            //   eb33                 | jmp                 0x35
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   3bc6                 | cmp                 eax, esi
            //   7305                 | jae                 7
            //   6afb                 | push                -5

        $sequence_3 = { 8b38 ff15???????? 3907 740d 8bf7 837e0400 8d4604 }
            // n = 7, score = 500
            //   8b38                 | mov                 edi, dword ptr [eax]
            //   ff15????????         |                     
            //   3907                 | cmp                 dword ptr [edi], eax
            //   740d                 | je                  0xf
            //   8bf7                 | mov                 esi, edi
            //   837e0400             | cmp                 dword ptr [esi + 4], 0
            //   8d4604               | lea                 eax, [esi + 4]

        $sequence_4 = { 33c0 5f 5e c3 55 8bec 81ec04010000 }
            // n = 7, score = 500
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ec04010000         | sub                 esp, 0x104

        $sequence_5 = { 57 e8???????? 59 0fb6c0 eb03 6a1e 58 }
            // n = 7, score = 500
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   0fb6c0               | movzx               eax, al
            //   eb03                 | jmp                 5
            //   6a1e                 | push                0x1e
            //   58                   | pop                 eax

        $sequence_6 = { 50 57 e8???????? c1ee10 56 57 }
            // n = 6, score = 500
            //   50                   | push                eax
            //   57                   | push                edi
            //   e8????????           |                     
            //   c1ee10               | shr                 esi, 0x10
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_7 = { ff742414 8bfe 2bfd ffd3 3bf8 7513 57 }
            // n = 7, score = 500
            //   ff742414             | push                dword ptr [esp + 0x14]
            //   8bfe                 | mov                 edi, esi
            //   2bfd                 | sub                 edi, ebp
            //   ffd3                 | call                ebx
            //   3bf8                 | cmp                 edi, eax
            //   7513                 | jne                 0x15
            //   57                   | push                edi

        $sequence_8 = { 8ad0 d3fb 8b4d14 d2e2 8b4dfc 221e 2b4d08 }
            // n = 7, score = 500
            //   8ad0                 | mov                 dl, al
            //   d3fb                 | sar                 ebx, cl
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]
            //   d2e2                 | shl                 dl, cl
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   221e                 | and                 bl, byte ptr [esi]
            //   2b4d08               | sub                 ecx, dword ptr [ebp + 8]

        $sequence_9 = { ff35???????? e8???????? 59 59 33c0 eb78 8b45fc }
            // n = 7, score = 500
            //   ff35????????         |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   eb78                 | jmp                 0x7a
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

    condition:
        7 of them and filesize < 829440
}