rule win_nefilim_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.nefilim."
        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.nefilim"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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???????? c9 c3 55 8bec 33c0 f6450c03 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   33c0                 | xor                 eax, eax
            //   f6450c03             | test                byte ptr [ebp + 0xc], 3

        $sequence_1 = { 4a 741d 4a 7409 }
            // n = 4, score = 200
            //   4a                   | dec                 edx
            //   741d                 | je                  0x1f
            //   4a                   | dec                 edx
            //   7409                 | je                  0xb

        $sequence_2 = { 8d4de0 837df408 8b55f0 8d3451 8b4de0 }
            // n = 5, score = 200
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   837df408             | cmp                 dword ptr [ebp - 0xc], 8
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   8d3451               | lea                 esi, [ecx + edx*2]
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]

        $sequence_3 = { 81ecec020000 a1???????? 33c4 898424e8020000 53 56 }
            // n = 6, score = 200
            //   81ecec020000         | sub                 esp, 0x2ec
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   898424e8020000       | mov                 dword ptr [esp + 0x2e8], eax
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_4 = { ff15???????? 8144242890d00300 8b44241c 115c242c 3944242c 0f8c3dffffff }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   8144242890d00300     | add                 dword ptr [esp + 0x28], 0x3d090
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   115c242c             | adc                 dword ptr [esp + 0x2c], ebx
            //   3944242c             | cmp                 dword ptr [esp + 0x2c], eax
            //   0f8c3dffffff         | jl                  0xffffff43

        $sequence_5 = { 7304 8d442414 68???????? 50 ffd6 85c0 0f8482000000 }
            // n = 7, score = 200
            //   7304                 | jae                 6
            //   8d442414             | lea                 eax, [esp + 0x14]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   0f8482000000         | je                  0x88

        $sequence_6 = { 7421 68???????? 8d442444 e8???????? }
            // n = 4, score = 200
            //   7421                 | je                  0x23
            //   68????????           |                     
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   e8????????           |                     

        $sequence_7 = { 8d8424d0000000 50 ffd6 85c0 7421 8b4c2430 397c2444 }
            // n = 7, score = 200
            //   8d8424d0000000       | lea                 eax, [esp + 0xd0]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   7421                 | je                  0x23
            //   8b4c2430             | mov                 ecx, dword ptr [esp + 0x30]
            //   397c2444             | cmp                 dword ptr [esp + 0x44], edi

        $sequence_8 = { 68???????? 8d742444 e8???????? 6a01 33ff e8???????? be00010000 }
            // n = 7, score = 200
            //   68????????           |                     
            //   8d742444             | lea                 esi, [esp + 0x44]
            //   e8????????           |                     
            //   6a01                 | push                1
            //   33ff                 | xor                 edi, edi
            //   e8????????           |                     
            //   be00010000           | mov                 esi, 0x100

        $sequence_9 = { 0f84fd020000 68???????? 8d8424d0000000 50 ffd6 }
            // n = 5, score = 200
            //   0f84fd020000         | je                  0x303
            //   68????????           |                     
            //   8d8424d0000000       | lea                 eax, [esp + 0xd0]
            //   50                   | push                eax
            //   ffd6                 | call                esi

    condition:
        7 of them and filesize < 142336
}