rule win_byeby_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.byeby."
        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.byeby"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { f30f7e0e 83e908 8d7608 660fd60f 8d7f08 8b048de8cb0010 }
            // n = 6, score = 100
            //   f30f7e0e             | movq                xmm1, qword ptr [esi]
            //   83e908               | sub                 ecx, 8
            //   8d7608               | lea                 esi, [esi + 8]
            //   660fd60f             | movq                qword ptr [edi], xmm1
            //   8d7f08               | lea                 edi, [edi + 8]
            //   8b048de8cb0010       | mov                 eax, dword ptr [ecx*4 + 0x1000cbe8]

        $sequence_1 = { e8???????? 6a04 8d442430 c7442430c0270900 50 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   6a04                 | push                4
            //   8d442430             | lea                 eax, [esp + 0x30]
            //   c7442430c0270900     | mov                 dword ptr [esp + 0x30], 0x927c0
            //   50                   | push                eax

        $sequence_2 = { 6803010000 8d85c9fdffff c685c8fdffff00 6a00 50 }
            // n = 5, score = 100
            //   6803010000           | push                0x103
            //   8d85c9fdffff         | lea                 eax, [ebp - 0x237]
            //   c685c8fdffff00       | mov                 byte ptr [ebp - 0x238], 0
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_3 = { ffb578feffff ff15???????? ffb57cfeffff ff15???????? 8b4dfc }
            // n = 5, score = 100
            //   ffb578feffff         | push                dword ptr [ebp - 0x188]
            //   ff15????????         |                     
            //   ffb57cfeffff         | push                dword ptr [ebp - 0x184]
            //   ff15????????         |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_4 = { 83f8ff 7535 8d4df0 c745f0556d566a }
            // n = 4, score = 100
            //   83f8ff               | cmp                 eax, -1
            //   7535                 | jne                 0x37
            //   8d4df0               | lea                 ecx, [ebp - 0x10]
            //   c745f0556d566a       | mov                 dword ptr [ebp - 0x10], 0x6a566d55

        $sequence_5 = { 6a04 51 6806100000 68ffff0000 50 c744244060ea0000 ffd6 }
            // n = 7, score = 100
            //   6a04                 | push                4
            //   51                   | push                ecx
            //   6806100000           | push                0x1006
            //   68ffff0000           | push                0xffff
            //   50                   | push                eax
            //   c744244060ea0000     | mov                 dword ptr [esp + 0x40], 0xea60
            //   ffd6                 | call                esi

        $sequence_6 = { 8d8424f80a0000 64a300000000 6800020000 8d8424d8000000 0f57c0 }
            // n = 5, score = 100
            //   8d8424f80a0000       | lea                 eax, [esp + 0xaf8]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   6800020000           | push                0x200
            //   8d8424d8000000       | lea                 eax, [esp + 0xd8]
            //   0f57c0               | xorps               xmm0, xmm0

        $sequence_7 = { 50 e8???????? 83c40c 85c0 0f85db000000 6a40 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   0f85db000000         | jne                 0xe1
            //   6a40                 | push                0x40

        $sequence_8 = { c685a0fcffff00 6a00 50 e8???????? 83c40c 8d4705 8b3d???????? }
            // n = 7, score = 100
            //   c685a0fcffff00       | mov                 byte ptr [ebp - 0x360], 0
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d4705               | lea                 eax, [edi + 5]
            //   8b3d????????         |                     

        $sequence_9 = { 6a00 50 e8???????? 83c40c c78424d40200005656424d 8d8424d4020000 c78424d802000054304645 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   c78424d40200005656424d     | mov    dword ptr [esp + 0x2d4], 0x4d425656
            //   8d8424d4020000       | lea                 eax, [esp + 0x2d4]
            //   c78424d802000054304645     | mov    dword ptr [esp + 0x2d8], 0x45463054

    condition:
        7 of them and filesize < 253952
}