rule win_conficker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 741e 3c08 7422 42 3c04 }
            // n = 5, score = 300
            //   741e                 | je                  0x20
            //   3c08                 | cmp                 al, 8
            //   7422                 | je                  0x24
            //   42                   | inc                 edx
            //   3c04                 | cmp                 al, 4

        $sequence_1 = { 57 8b7c2414 33f6 85ff 7e18 ff15???????? 6a1a }
            // n = 7, score = 300
            //   57                   | push                edi
            //   8b7c2414             | mov                 edi, dword ptr [esp + 0x14]
            //   33f6                 | xor                 esi, esi
            //   85ff                 | test                edi, edi
            //   7e18                 | jle                 0x1a
            //   ff15????????         |                     
            //   6a1a                 | push                0x1a

        $sequence_2 = { 60 b067 f2ae 61 7509 80ea03 fec8 }
            // n = 7, score = 300
            //   60                   | pushal              
            //   b067                 | mov                 al, 0x67
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   61                   | popal               
            //   7509                 | jne                 0xb
            //   80ea03               | sub                 dl, 3
            //   fec8                 | dec                 al

        $sequence_3 = { e2f4 8bc2 c1e805 8b0483 8bca 83e11f }
            // n = 6, score = 300
            //   e2f4                 | loop                0xfffffff6
            //   8bc2                 | mov                 eax, edx
            //   c1e805               | shr                 eax, 5
            //   8b0483               | mov                 eax, dword ptr [ebx + eax*4]
            //   8bca                 | mov                 ecx, edx
            //   83e11f               | and                 ecx, 0x1f

        $sequence_4 = { fec8 74c1 80c204 ebbc 663d0006 75b6 42 }
            // n = 7, score = 300
            //   fec8                 | dec                 al
            //   74c1                 | je                  0xffffffc3
            //   80c204               | add                 dl, 4
            //   ebbc                 | jmp                 0xffffffbe
            //   663d0006             | cmp                 ax, 0x600
            //   75b6                 | jne                 0xffffffb8
            //   42                   | inc                 edx

        $sequence_5 = { 33ff 397d10 7e38 56 fec3 }
            // n = 5, score = 300
            //   33ff                 | xor                 edi, edi
            //   397d10               | cmp                 dword ptr [ebp + 0x10], edi
            //   7e38                 | jle                 0x3a
            //   56                   | push                esi
            //   fec3                 | inc                 bl

        $sequence_6 = { ebbc 663d0006 75b6 42 ebb2 3c00 75ae }
            // n = 7, score = 300
            //   ebbc                 | jmp                 0xffffffbe
            //   663d0006             | cmp                 ax, 0x600
            //   75b6                 | jne                 0xffffffb8
            //   42                   | inc                 edx
            //   ebb2                 | jmp                 0xffffffb4
            //   3c00                 | cmp                 al, 0
            //   75ae                 | jne                 0xffffffb0

        $sequence_7 = { 4a 0f8968ffffff 5f 5e 5d c3 }
            // n = 6, score = 300
            //   4a                   | dec                 edx
            //   0f8968ffffff         | jns                 0xffffff6e
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_8 = { be00000080 2175fc df6df8 8365f800 894dfc }
            // n = 5, score = 300
            //   be00000080           | mov                 esi, 0x80000000
            //   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

        $sequence_9 = { 1907 8d7604 8d7f04 e2f4 }
            // n = 4, score = 300
            //   1907                 | sbb                 dword ptr [edi], eax
            //   8d7604               | lea                 esi, [esi + 4]
            //   8d7f04               | lea                 edi, [edi + 4]
            //   e2f4                 | loop                0xfffffff6

    condition:
        7 of them and filesize < 335872
}