rule win_sedll_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.sedll."
        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.sedll"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 3a06 7527 83f9fd 7440 }
            // n = 4, score = 200
            //   3a06                 | cmp                 al, byte ptr [esi]
            //   7527                 | jne                 0x29
            //   83f9fd               | cmp                 ecx, -3
            //   7440                 | je                  0x42

        $sequence_1 = { c0e302 8b55f4 8945f8 8bc2 c1f804 0ac3 8806 }
            // n = 7, score = 200
            //   c0e302               | shl                 bl, 2
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8bc2                 | mov                 eax, edx
            //   c1f804               | sar                 eax, 4
            //   0ac3                 | or                  al, bl
            //   8806                 | mov                 byte ptr [esi], al

        $sequence_2 = { 50 8bc7 2bc6 50 8b4508 03c6 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   8bc7                 | mov                 eax, edi
            //   2bc6                 | sub                 eax, esi
            //   50                   | push                eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   03c6                 | add                 eax, esi

        $sequence_3 = { ff15???????? 8bf0 85f6 7534 8b45fc 68???????? }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7534                 | jne                 0x36
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   68????????           |                     

        $sequence_4 = { 5d c3 8b4df8 8b4508 2bf1 5f }
            // n = 6, score = 200
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   2bf1                 | sub                 esi, ecx
            //   5f                   | pop                 edi

        $sequence_5 = { 884e01 885602 83c603 33c9 47 3bfb 72a8 }
            // n = 7, score = 200
            //   884e01               | mov                 byte ptr [esi + 1], cl
            //   885602               | mov                 byte ptr [esi + 2], dl
            //   83c603               | add                 esi, 3
            //   33c9                 | xor                 ecx, ecx
            //   47                   | inc                 edi
            //   3bfb                 | cmp                 edi, ebx
            //   72a8                 | jb                  0xffffffaa

        $sequence_6 = { ff15???????? 8b7d0c 33f6 8975fc 6a00 }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   8b7d0c               | mov                 edi, dword ptr [ebp + 0xc]
            //   33f6                 | xor                 esi, esi
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   6a00                 | push                0

        $sequence_7 = { 33f6 8975f8 6a3c 8d4598 c7459044000000 }
            // n = 5, score = 200
            //   33f6                 | xor                 esi, esi
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   6a3c                 | push                0x3c
            //   8d4598               | lea                 eax, dword ptr [ebp - 0x68]
            //   c7459044000000       | mov                 dword ptr [ebp - 0x70], 0x44

        $sequence_8 = { 6a00 56 53 ff15???????? 8b7d0c 33f6 8975fc }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   56                   | push                esi
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8b7d0c               | mov                 edi, dword ptr [ebp + 0xc]
            //   33f6                 | xor                 esi, esi
            //   8975fc               | mov                 dword ptr [ebp - 4], esi

        $sequence_9 = { ba???????? be0c000000 8d4900 8b01 3b02 7531 83c104 }
            // n = 7, score = 200
            //   ba????????           |                     
            //   be0c000000           | mov                 esi, 0xc
            //   8d4900               | lea                 ecx, dword ptr [ecx]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   3b02                 | cmp                 eax, dword ptr [edx]
            //   7531                 | jne                 0x33
            //   83c104               | add                 ecx, 4

    condition:
        7 of them and filesize < 65536
}