rule win_hellokitty_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.hellokitty."
        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.hellokitty"
        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 = { 33d0 03fe 03fa 8b55b4 8bca 897dfc c1c10f }
            // n = 7, score = 100
            //   33d0                 | xor                 edx, eax
            //   03fe                 | add                 edi, esi
            //   03fa                 | add                 edi, edx
            //   8b55b4               | mov                 edx, dword ptr [ebp - 0x4c]
            //   8bca                 | mov                 ecx, edx
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   c1c10f               | rol                 ecx, 0xf

        $sequence_1 = { 8945d8 8b412c 8945fc 8b4130 8945c4 8b4134 8945f8 }
            // n = 7, score = 100
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax
            //   8b412c               | mov                 eax, dword ptr [ecx + 0x2c]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b4130               | mov                 eax, dword ptr [ecx + 0x30]
            //   8945c4               | mov                 dword ptr [ebp - 0x3c], eax
            //   8b4134               | mov                 eax, dword ptr [ecx + 0x34]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_2 = { 8b04b2 c1e808 8841fe 8a04b2 46 }
            // n = 5, score = 100
            //   8b04b2               | mov                 eax, dword ptr [edx + esi*4]
            //   c1e808               | shr                 eax, 8
            //   8841fe               | mov                 byte ptr [ecx - 2], al
            //   8a04b2               | mov                 al, byte ptr [edx + esi*4]
            //   46                   | inc                 esi

        $sequence_3 = { 234de4 0bc1 03c6 03c2 8b55d8 8945ec }
            // n = 6, score = 100
            //   234de4               | and                 ecx, dword ptr [ebp - 0x1c]
            //   0bc1                 | or                  eax, ecx
            //   03c6                 | add                 eax, esi
            //   03c2                 | add                 eax, edx
            //   8b55d8               | mov                 edx, dword ptr [ebp - 0x28]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax

        $sequence_4 = { 7518 395df8 7413 53 6a01 ff75fc ff15???????? }
            // n = 7, score = 100
            //   7518                 | jne                 0x1a
            //   395df8               | cmp                 dword ptr [ebp - 8], ebx
            //   7413                 | je                  0x15
            //   53                   | push                ebx
            //   6a01                 | push                1
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     

        $sequence_5 = { 3355b0 3355d4 3355c0 c1c802 8bc8 }
            // n = 5, score = 100
            //   3355b0               | xor                 edx, dword ptr [ebp - 0x50]
            //   3355d4               | xor                 edx, dword ptr [ebp - 0x2c]
            //   3355c0               | xor                 edx, dword ptr [ebp - 0x40]
            //   c1c802               | ror                 eax, 2
            //   8bc8                 | mov                 ecx, eax

        $sequence_6 = { 334dbc 334da8 d1c1 894de4 8bcf 0bc8 c1c205 }
            // n = 7, score = 100
            //   334dbc               | xor                 ecx, dword ptr [ebp - 0x44]
            //   334da8               | xor                 ecx, dword ptr [ebp - 0x58]
            //   d1c1                 | rol                 ecx, 1
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   8bcf                 | mov                 ecx, edi
            //   0bc8                 | or                  ecx, eax
            //   c1c205               | rol                 edx, 5

        $sequence_7 = { 0fb74712 83c40c 03f0 807f2502 }
            // n = 4, score = 100
            //   0fb74712             | movzx               eax, word ptr [edi + 0x12]
            //   83c40c               | add                 esp, 0xc
            //   03f0                 | add                 esi, eax
            //   807f2502             | cmp                 byte ptr [edi + 0x25], 2

        $sequence_8 = { 8bc8 894f70 85c9 7507 be21020000 eb63 0fb703 }
            // n = 7, score = 100
            //   8bc8                 | mov                 ecx, eax
            //   894f70               | mov                 dword ptr [edi + 0x70], ecx
            //   85c9                 | test                ecx, ecx
            //   7507                 | jne                 9
            //   be21020000           | mov                 esi, 0x221
            //   eb63                 | jmp                 0x65
            //   0fb703               | movzx               eax, word ptr [ebx]

        $sequence_9 = { 59 50 8d4c2458 e8???????? 8d4c2470 e8???????? 8d8c2488000000 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   8d4c2458             | lea                 ecx, [esp + 0x58]
            //   e8????????           |                     
            //   8d4c2470             | lea                 ecx, [esp + 0x70]
            //   e8????????           |                     
            //   8d8c2488000000       | lea                 ecx, [esp + 0x88]

    condition:
        7 of them and filesize < 319488
}