rule win_conficker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.conficker."
        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.conficker"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 7415 42 42 60 b066 f2ae }
            // n = 6, score = 300
            //   7415                 | je                  0x17
            //   42                   | inc                 edx
            //   42                   | inc                 edx
            //   60                   | pushal              
            //   b066                 | mov                 al, 0x66
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]

        $sequence_1 = { ebe4 f60638 75a8 b008 d0ef 1400 }
            // n = 6, score = 300
            //   ebe4                 | jmp                 0xffffffe6
            //   f60638               | test                byte ptr [esi], 0x38
            //   75a8                 | jne                 0xffffffaa
            //   b008                 | mov                 al, 8
            //   d0ef                 | shr                 bh, 1
            //   1400                 | adc                 al, 0

        $sequence_2 = { 8bce 81e1ffffff00 81f9fdffff00 741b 8bce }
            // n = 5, score = 300
            //   8bce                 | mov                 ecx, esi
            //   81e1ffffff00         | and                 ecx, 0xffffff
            //   81f9fdffff00         | cmp                 ecx, 0xfffffd
            //   741b                 | je                  0x1d
            //   8bce                 | mov                 ecx, esi

        $sequence_3 = { 8365f800 894dfc 2175fc d9e0 23cf dec1 }
            // n = 6, score = 300
            //   8365f800             | and                 dword ptr [ebp - 8], 0
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   2175fc               | and                 dword ptr [ebp - 4], esi
            //   d9e0                 | fchs                
            //   23cf                 | and                 ecx, edi
            //   dec1                 | faddp               st(1)

        $sequence_4 = { 8d44004c 50 6a40 ff15???????? }
            // n = 4, score = 300
            //   8d44004c             | lea                 eax, [eax + eax + 0x4c]
            //   50                   | push                eax
            //   6a40                 | push                0x40
            //   ff15????????         |                     

        $sequence_5 = { 51 31c9 49 41 }
            // n = 4, score = 300
            //   51                   | push                ecx
            //   31c9                 | xor                 ecx, ecx
            //   49                   | dec                 ecx
            //   41                   | inc                 ecx

        $sequence_6 = { 395df8 7507 c745fc01000000 57 ff15???????? 3975fc 5b }
            // n = 7, score = 300
            //   395df8               | cmp                 dword ptr [ebp - 8], ebx
            //   7507                 | jne                 9
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   57                   | push                edi
            //   ff15????????         |                     
            //   3975fc               | cmp                 dword ptr [ebp - 4], esi
            //   5b                   | pop                 ebx

        $sequence_7 = { 2c05 746c 42 89ec 8954241c 61 }
            // n = 6, score = 300
            //   2c05                 | sub                 al, 5
            //   746c                 | je                  0x6e
            //   42                   | inc                 edx
            //   89ec                 | mov                 esp, ebp
            //   8954241c             | mov                 dword ptr [esp + 0x1c], edx
            //   61                   | popal               

        $sequence_8 = { b067 f2ae 61 7413 80fc04 7417 80fc05 }
            // n = 7, score = 300
            //   b067                 | mov                 al, 0x67
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   61                   | popal               
            //   7413                 | je                  0x15
            //   80fc04               | cmp                 ah, 4
            //   7417                 | je                  0x19
            //   80fc05               | cmp                 ah, 5

        $sequence_9 = { 85c0 7511 ff7508 ff15???????? 59 3dc8000000 }
            // n = 6, score = 300
            //   85c0                 | test                eax, eax
            //   7511                 | jne                 0x13
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   3dc8000000           | cmp                 eax, 0xc8

    condition:
        7 of them and filesize < 335872
}