rule win_mydoom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.mydoom."
        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.mydoom"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { e8???????? ba00000000 85c0 740e }
            // n = 4, score = 100
            //   e8????????           |                     
            //   ba00000000           | mov                 edx, 0
            //   85c0                 | test                eax, eax
            //   740e                 | je                  0x10

        $sequence_1 = { 74e2 89442404 c70424???????? e8???????? }
            // n = 4, score = 100
            //   74e2                 | je                  0xffffffe4
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   c70424????????       |                     
            //   e8????????           |                     

        $sequence_2 = { 0f85cc010000 893424 e8???????? ba00000000 e9???????? }
            // n = 5, score = 100
            //   0f85cc010000         | jne                 0x1d2
            //   893424               | mov                 dword ptr [esp], esi
            //   e8????????           |                     
            //   ba00000000           | mov                 edx, 0
            //   e9????????           |                     

        $sequence_3 = { 89d8 f3ab 8dbd08ffffff b90a000000 f3ab c7442404???????? }
            // n = 6, score = 100
            //   89d8                 | mov                 eax, ebx
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8dbd08ffffff         | lea                 edi, dword ptr [ebp - 0xf8]
            //   b90a000000           | mov                 ecx, 0xa
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   c7442404????????     |                     

        $sequence_4 = { 56 53 81ecc0000000 8b7508 }
            // n = 4, score = 100
            //   56                   | push                esi
            //   53                   | push                ebx
            //   81ecc0000000         | sub                 esp, 0xc0
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]

        $sequence_5 = { 890424 e8???????? c9 83f801 }
            // n = 4, score = 100
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   c9                   | leave               
            //   83f801               | cmp                 eax, 1

        $sequence_6 = { 85c0 0f84cc000000 897c2410 8d85e0feffff 8944240c 89742408 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   0f84cc000000         | je                  0xd2
            //   897c2410             | mov                 dword ptr [esp + 0x10], edi
            //   8d85e0feffff         | lea                 eax, dword ptr [ebp - 0x120]
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   89742408             | mov                 dword ptr [esp + 8], esi

        $sequence_7 = { c744240496000000 8d8548ffffff 890424 e8???????? }
            // n = 4, score = 100
            //   c744240496000000     | mov                 dword ptr [esp + 4], 0x96
            //   8d8548ffffff         | lea                 eax, dword ptr [ebp - 0xb8]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     

        $sequence_8 = { 83ec08 ba00000000 85c0 0f85a1010000 c744240800000000 c744240401000000 c7042402000000 }
            // n = 7, score = 100
            //   83ec08               | sub                 esp, 8
            //   ba00000000           | mov                 edx, 0
            //   85c0                 | test                eax, eax
            //   0f85a1010000         | jne                 0x1a7
            //   c744240800000000     | mov                 dword ptr [esp + 8], 0
            //   c744240401000000     | mov                 dword ptr [esp + 4], 1
            //   c7042402000000       | mov                 dword ptr [esp], 2

        $sequence_9 = { c1f81f 29c2 8d0452 8d0482 01c0 29c1 0fbe5429b8 }
            // n = 7, score = 100
            //   c1f81f               | sar                 eax, 0x1f
            //   29c2                 | sub                 edx, eax
            //   8d0452               | lea                 eax, dword ptr [edx + edx*2]
            //   8d0482               | lea                 eax, dword ptr [edx + eax*4]
            //   01c0                 | add                 eax, eax
            //   29c1                 | sub                 ecx, eax
            //   0fbe5429b8           | movsx               edx, byte ptr [ecx + ebp - 0x48]

    condition:
        7 of them and filesize < 114688
}