rule win_conficker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.conficker"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { ff7508 ff15???????? 59 59 85c0 7511 ff7508 }
            // n = 7, score = 300
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7511                 | jne                 0x13
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_1 = { 8b4804 53 8b18 57 33ff 397d10 7e38 }
            // n = 7, score = 300
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   53                   | push                ebx
            //   8b18                 | mov                 ebx, dword ptr [eax]
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   397d10               | cmp                 dword ptr [ebp + 0x10], edi
            //   7e38                 | jle                 0x3a

        $sequence_2 = { f2ae 61 7502 4a 4a 3c09 }
            // n = 6, score = 300
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   61                   | popal               
            //   7502                 | jne                 4
            //   4a                   | dec                 edx
            //   4a                   | dec                 edx
            //   3c09                 | cmp                 al, 9

        $sequence_3 = { 7513 68e8030000 ff15???????? 46 83fe14 }
            // n = 5, score = 300
            //   7513                 | jne                 0x15
            //   68e8030000           | push                0x3e8
            //   ff15????????         |                     
            //   46                   | inc                 esi
            //   83fe14               | cmp                 esi, 0x14

        $sequence_4 = { d9e0 dec1 dc45e0 dc4df0 }
            // n = 4, score = 300
            //   d9e0                 | fchs                
            //   dec1                 | faddp               st(1)
            //   dc45e0               | fadd                qword ptr [ebp - 0x20]
            //   dc4df0               | fmul                qword ptr [ebp - 0x10]

        $sequence_5 = { 8a47ff 240f 3c0c 7503 5a f7d2 }
            // n = 6, score = 300
            //   8a47ff               | mov                 al, byte ptr [edi - 1]
            //   240f                 | and                 al, 0xf
            //   3c0c                 | cmp                 al, 0xc
            //   7503                 | jne                 5
            //   5a                   | pop                 edx
            //   f7d2                 | not                 edx

        $sequence_6 = { 2175fc df6df8 8365f800 894dfc 2175fc d9e0 }
            // n = 6, score = 300
            //   2175fc               | and                 dword ptr [ebp - 4], esi
            //   df6df8               | fild                qword ptr [ebp - 8]
            //   8365f800             | and                 dword ptr [ebp - 8], 0
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   2175fc               | and                 dword ptr [ebp - 4], esi
            //   d9e0                 | fchs                

        $sequence_7 = { ff4508 817d0800010000 7ccc 5f 5e }
            // n = 5, score = 300
            //   ff4508               | inc                 dword ptr [ebp + 8]
            //   817d0800010000       | cmp                 dword ptr [ebp + 8], 0x100
            //   7ccc                 | jl                  0xffffffce
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_8 = { b067 f2ae 61 7509 80ea03 }
            // n = 5, score = 300
            //   b067                 | mov                 al, 0x67
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   61                   | popal               
            //   7509                 | jne                 0xb
            //   80ea03               | sub                 dl, 3

        $sequence_9 = { 8b742408 8bd0 c1ea05 8b1496 8bc8 }
            // n = 5, score = 300
            //   8b742408             | mov                 esi, dword ptr [esp + 8]
            //   8bd0                 | mov                 edx, eax
            //   c1ea05               | shr                 edx, 5
            //   8b1496               | mov                 edx, dword ptr [esi + edx*4]
            //   8bc8                 | mov                 ecx, eax

    condition:
        7 of them and filesize < 335872
}