rule win_flowershop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { c3 55 8bec 81ec0c020000 53 33db 391d???????? }
            // n = 7, score = 500
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ec0c020000         | sub                 esp, 0x20c
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   391d????????         |                     

        $sequence_1 = { 85c0 7502 33f6 8325????????00 }
            // n = 4, score = 500
            //   85c0                 | test                eax, eax
            //   7502                 | jne                 4
            //   33f6                 | xor                 esi, esi
            //   8325????????00       |                     

        $sequence_2 = { 8b7dfc 8b5510 8a08 3a0c02 74db 8d450f 6a01 }
            // n = 7, score = 500
            //   8b7dfc               | mov                 edi, dword ptr [ebp - 4]
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   3a0c02               | cmp                 cl, byte ptr [edx + eax]
            //   74db                 | je                  0xffffffdd
            //   8d450f               | lea                 eax, [ebp + 0xf]
            //   6a01                 | push                1

        $sequence_3 = { 894610 89460c 33c0 5b eb69 e8???????? 85c0 }
            // n = 7, score = 500
            //   894610               | mov                 dword ptr [esi + 0x10], eax
            //   89460c               | mov                 dword ptr [esi + 0xc], eax
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   eb69                 | jmp                 0x6b
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_4 = { 0fb70d???????? 8bc2 8bd9 2bc1 2bda 8d7c07ff 8d741e01 }
            // n = 7, score = 500
            //   0fb70d????????       |                     
            //   8bc2                 | mov                 eax, edx
            //   8bd9                 | mov                 ebx, ecx
            //   2bc1                 | sub                 eax, ecx
            //   2bda                 | sub                 ebx, edx
            //   8d7c07ff             | lea                 edi, [edi + eax - 1]
            //   8d741e01             | lea                 esi, [esi + ebx + 1]

        $sequence_5 = { 750b 881d???????? e9???????? 53 57 ff15???????? 83f8ff }
            // n = 7, score = 500
            //   750b                 | jne                 0xd
            //   881d????????         |                     
            //   e9????????           |                     
            //   53                   | push                ebx
            //   57                   | push                edi
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1

        $sequence_6 = { a1???????? 8b4004 8906 8b45f8 83c00a 8907 33c0 }
            // n = 7, score = 500
            //   a1????????           |                     
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   8906                 | mov                 dword ptr [esi], eax
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   83c00a               | add                 eax, 0xa
            //   8907                 | mov                 dword ptr [edi], eax
            //   33c0                 | xor                 eax, eax

        $sequence_7 = { 7427 8bc7 83e003 84c0 751b f60601 6a00 }
            // n = 7, score = 500
            //   7427                 | je                  0x29
            //   8bc7                 | mov                 eax, edi
            //   83e003               | and                 eax, 3
            //   84c0                 | test                al, al
            //   751b                 | jne                 0x1d
            //   f60601               | test                byte ptr [esi], 1
            //   6a00                 | push                0

        $sequence_8 = { 752b 0fb715???????? 0fb70d???????? 8bc2 8bd9 2bc1 2bda }
            // n = 7, score = 500
            //   752b                 | jne                 0x2d
            //   0fb715????????       |                     
            //   0fb70d????????       |                     
            //   8bc2                 | mov                 eax, edx
            //   8bd9                 | mov                 ebx, ecx
            //   2bc1                 | sub                 eax, ecx
            //   2bda                 | sub                 ebx, edx

        $sequence_9 = { 745f 8345fc0a 8d45e4 50 8975e0 ff15???????? 57 }
            // n = 7, score = 500
            //   745f                 | je                  0x61
            //   8345fc0a             | add                 dword ptr [ebp - 4], 0xa
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   ff15????????         |                     
            //   57                   | push                edi

    condition:
        7 of them and filesize < 829440
}