rule win_conficker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 46 3bf7 7ce9 c6043b00 5f 5e 5b }
            // n = 7, score = 300
            //   46                   | inc                 esi
            //   3bf7                 | cmp                 esi, edi
            //   7ce9                 | jl                  0xffffffeb
            //   c6043b00             | mov                 byte ptr [ebx + edi], 0
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_1 = { e8???????? 59 99 6a1a }
            // n = 4, score = 300
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   99                   | cdq                 
            //   6a1a                 | push                0x1a

        $sequence_2 = { 8d44004c 50 6a40 ff15???????? 8bf0 }
            // n = 5, score = 300
            //   8d44004c             | lea                 eax, [eax + eax + 0x4c]
            //   50                   | push                eax
            //   6a40                 | push                0x40
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_3 = { 80e407 60 b067 f2ae }
            // n = 4, score = 300
            //   80e407               | and                 ah, 7
            //   60                   | pushal              
            //   b067                 | mov                 al, 0x67
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]

        $sequence_4 = { 6811f0f050 b910471215 51 6847121511 }
            // n = 4, score = 300
            //   6811f0f050           | push                0x50f0f011
            //   b910471215           | mov                 ecx, 0x15124710
            //   51                   | push                ecx
            //   6847121511           | push                0x11151247

        $sequence_5 = { 742b 3c07 742f 3c0b 747e 42 3c03 }
            // n = 7, score = 300
            //   742b                 | je                  0x2d
            //   3c07                 | cmp                 al, 7
            //   742f                 | je                  0x31
            //   3c0b                 | cmp                 al, 0xb
            //   747e                 | je                  0x80
            //   42                   | inc                 edx
            //   3c03                 | cmp                 al, 3

        $sequence_6 = { 743b 8bce 81e1fffe0000 81f9c6120000 }
            // n = 4, score = 300
            //   743b                 | je                  0x3d
            //   8bce                 | mov                 ecx, esi
            //   81e1fffe0000         | and                 ecx, 0xfeff
            //   81f9c6120000         | cmp                 ecx, 0x12c6

        $sequence_7 = { 42 60 b066 f2ae 61 7502 4a }
            // n = 7, score = 300
            //   42                   | inc                 edx
            //   60                   | pushal              
            //   b066                 | mov                 al, 0x66
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   61                   | popal               
            //   7502                 | jne                 4
            //   4a                   | dec                 edx

        $sequence_8 = { 681c701c20 682b606747 6811102120 6825161240 6822208782 }
            // n = 5, score = 300
            //   681c701c20           | push                0x201c701c
            //   682b606747           | push                0x4767602b
            //   6811102120           | push                0x20211011
            //   6825161240           | push                0x40121625
            //   6822208782           | push                0x82872022

        $sequence_9 = { d3e8 a801 7443 8b7d08 }
            // n = 4, score = 300
            //   d3e8                 | shr                 eax, cl
            //   a801                 | test                al, 1
            //   7443                 | je                  0x45
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

    condition:
        7 of them and filesize < 335872
}