rule win_flowershop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 895c3204 8b16 c1e204 894c3208 8b16 0fb64d0a }
            // n = 6, score = 500
            //   895c3204             | mov                 dword ptr [edx + esi + 4], ebx
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   c1e204               | shl                 edx, 4
            //   894c3208             | mov                 dword ptr [edx + esi + 8], ecx
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   0fb64d0a             | movzx               ecx, byte ptr [ebp + 0xa]

        $sequence_1 = { 740d ff45f4 83c038 394df4 72e4 eb07 }
            // n = 6, score = 500
            //   740d                 | je                  0xf
            //   ff45f4               | inc                 dword ptr [ebp - 0xc]
            //   83c038               | add                 eax, 0x38
            //   394df4               | cmp                 dword ptr [ebp - 0xc], ecx
            //   72e4                 | jb                  0xffffffe6
            //   eb07                 | jmp                 9

        $sequence_2 = { 8b5508 40 03cb 8a12 84d2 758b 48 }
            // n = 7, score = 500
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   40                   | inc                 eax
            //   03cb                 | add                 ecx, ebx
            //   8a12                 | mov                 dl, byte ptr [edx]
            //   84d2                 | test                dl, dl
            //   758b                 | jne                 0xffffff8d
            //   48                   | dec                 eax

        $sequence_3 = { 891d???????? a1???????? 3bc3 7415 50 53 }
            // n = 6, score = 500
            //   891d????????         |                     
            //   a1????????           |                     
            //   3bc3                 | cmp                 eax, ebx
            //   7415                 | je                  0x17
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_4 = { 833d????????01 74ed 53 55 56 57 bd04ea0000 }
            // n = 7, score = 500
            //   833d????????01       |                     
            //   74ed                 | je                  0xffffffef
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   56                   | push                esi
            //   57                   | push                edi
            //   bd04ea0000           | mov                 ebp, 0xea04

        $sequence_5 = { 6a01 8906 8b4508 8930 58 5f 5e }
            // n = 7, score = 500
            //   6a01                 | push                1
            //   8906                 | mov                 dword ptr [esi], eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8930                 | mov                 dword ptr [eax], esi
            //   58                   | pop                 eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_6 = { 5e c3 6afc 58 c3 55 8bec }
            // n = 7, score = 500
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   6afc                 | push                -4
            //   58                   | pop                 eax
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_7 = { ff15???????? 85c0 753b 57 ff751c ff7518 ff7514 }
            // n = 7, score = 500
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   753b                 | jne                 0x3d
            //   57                   | push                edi
            //   ff751c               | push                dword ptr [ebp + 0x1c]
            //   ff7518               | push                dword ptr [ebp + 0x18]
            //   ff7514               | push                dword ptr [ebp + 0x14]

        $sequence_8 = { 5b c9 c3 55 8bec 81ecd4070000 0fb70d???????? }
            // n = 7, score = 500
            //   5b                   | pop                 ebx
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ecd4070000         | sub                 esp, 0x7d4
            //   0fb70d????????       |                     

        $sequence_9 = { 0f84ad000000 3bc5 0f84a5000000 57 8b3d???????? 68???????? }
            // n = 6, score = 500
            //   0f84ad000000         | je                  0xb3
            //   3bc5                 | cmp                 eax, ebp
            //   0f84a5000000         | je                  0xab
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   68????????           |                     

    condition:
        7 of them and filesize < 829440
}