rule win_mydoom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 89442404 893424 e8???????? ba00000000 eb20 ba00000000 }
            // n = 6, score = 100
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   893424               | mov                 dword ptr [esp], esi
            //   e8????????           |                     
            //   ba00000000           | mov                 edx, 0
            //   eb20                 | jmp                 0x22
            //   ba00000000           | mov                 edx, 0

        $sequence_1 = { 89442424 895c2420 c744241c00000000 c744241800000000 c744241400000000 c744241001000000 c744240c00000000 }
            // n = 7, score = 100
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   895c2420             | mov                 dword ptr [esp + 0x20], ebx
            //   c744241c00000000     | mov                 dword ptr [esp + 0x1c], 0
            //   c744241800000000     | mov                 dword ptr [esp + 0x18], 0
            //   c744241400000000     | mov                 dword ptr [esp + 0x14], 0
            //   c744241001000000     | mov                 dword ptr [esp + 0x10], 1
            //   c744240c00000000     | mov                 dword ptr [esp + 0xc], 0

        $sequence_2 = { 84db 0f94c2 09d0 ba00000000 a801 0f85f6000000 }
            // n = 6, score = 100
            //   84db                 | test                bl, bl
            //   0f94c2               | sete                dl
            //   09d0                 | or                  eax, edx
            //   ba00000000           | mov                 edx, 0
            //   a801                 | test                al, 1
            //   0f85f6000000         | jne                 0xfc

        $sequence_3 = { 890424 e8???????? 83ec08 8b856cf9ffff 890424 }
            // n = 5, score = 100
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   83ec08               | sub                 esp, 8
            //   8b856cf9ffff         | mov                 eax, dword ptr [ebp - 0x694]
            //   890424               | mov                 dword ptr [esp], eax

        $sequence_4 = { 89e5 53 83ec54 c7442404???????? }
            // n = 4, score = 100
            //   89e5                 | mov                 ebp, esp
            //   53                   | push                ebx
            //   83ec54               | sub                 esp, 0x54
            //   c7442404????????     |                     

        $sequence_5 = { 0fb6d0 89d0 8b5df4 8b75f8 }
            // n = 4, score = 100
            //   0fb6d0               | movzx               edx, al
            //   89d0                 | mov                 eax, edx
            //   8b5df4               | mov                 ebx, dword ptr [ebp - 0xc]
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]

        $sequence_6 = { 893424 e8???????? 893424 e8???????? 83ec04 80bc2807feffff5c }
            // n = 6, score = 100
            //   893424               | mov                 dword ptr [esp], esi
            //   e8????????           |                     
            //   893424               | mov                 dword ptr [esp], esi
            //   e8????????           |                     
            //   83ec04               | sub                 esp, 4
            //   80bc2807feffff5c     | cmp                 byte ptr [eax + ebp - 0x1f9], 0x5c

        $sequence_7 = { 0fb705???????? 668945d0 0fb605???????? 8845d2 8d45d8 890424 e8???????? }
            // n = 7, score = 100
            //   0fb705????????       |                     
            //   668945d0             | mov                 word ptr [ebp - 0x30], ax
            //   0fb605????????       |                     
            //   8845d2               | mov                 byte ptr [ebp - 0x2e], al
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     

        $sequence_8 = { 83ec08 e8???????? e8???????? e8???????? b800000000 }
            // n = 5, score = 100
            //   83ec08               | sub                 esp, 8
            //   e8????????           |                     
            //   e8????????           |                     
            //   e8????????           |                     
            //   b800000000           | mov                 eax, 0

        $sequence_9 = { c7442404???????? 893c24 e8???????? c7042401000000 e8???????? 83ec04 c744240800000000 }
            // n = 7, score = 100
            //   c7442404????????     |                     
            //   893c24               | mov                 dword ptr [esp], edi
            //   e8????????           |                     
            //   c7042401000000       | mov                 dword ptr [esp], 1
            //   e8????????           |                     
            //   83ec04               | sub                 esp, 4
            //   c744240800000000     | mov                 dword ptr [esp + 8], 0

    condition:
        7 of them and filesize < 114688
}