rule win_nemty_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.nemty."
        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.nemty"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 5b c3 56 8bf0 3bf3 }
            // n = 5, score = 300
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   56                   | push                esi
            //   8bf0                 | mov                 esi, eax
            //   3bf3                 | cmp                 esi, ebx

        $sequence_1 = { 68???????? e8???????? 8bc1 2bc7 83f801 }
            // n = 5, score = 300
            //   68????????           |                     
            //   e8????????           |                     
            //   8bc1                 | mov                 eax, ecx
            //   2bc7                 | sub                 eax, edi
            //   83f801               | cmp                 eax, 1

        $sequence_2 = { 837dd810 8b75c4 8bc6 7305 8d45c4 8bf0 0fbe0418 }
            // n = 7, score = 300
            //   837dd810             | cmp                 dword ptr [ebp - 0x28], 0x10
            //   8b75c4               | mov                 esi, dword ptr [ebp - 0x3c]
            //   8bc6                 | mov                 eax, esi
            //   7305                 | jae                 7
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   8bf0                 | mov                 esi, eax
            //   0fbe0418             | movsx               eax, byte ptr [eax + ebx]

        $sequence_3 = { e8???????? 6a01 33ff 8d7508 e8???????? 8b4dfc }
            // n = 6, score = 300
            //   e8????????           |                     
            //   6a01                 | push                1
            //   33ff                 | xor                 edi, edi
            //   8d7508               | lea                 esi, [ebp + 8]
            //   e8????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_4 = { 68???????? e8???????? 59 84c0 7552 68???????? e8???????? }
            // n = 7, score = 300
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   84c0                 | test                al, al
            //   7552                 | jne                 0x54
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_5 = { ff15???????? 53 8d459c 50 ff35???????? }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   53                   | push                ebx
            //   8d459c               | lea                 eax, [ebp - 0x64]
            //   50                   | push                eax
            //   ff35????????         |                     

        $sequence_6 = { 8bec 56 8bf0 8b4610 57 83f801 }
            // n = 6, score = 300
            //   8bec                 | mov                 ebp, esp
            //   56                   | push                esi
            //   8bf0                 | mov                 esi, eax
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   57                   | push                edi
            //   83f801               | cmp                 eax, 1

        $sequence_7 = { 8bec 8b4d0c 8b5510 3bca 740d 53 }
            // n = 6, score = 300
            //   8bec                 | mov                 ebp, esp
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   3bca                 | cmp                 ecx, edx
            //   740d                 | je                  0xf
            //   53                   | push                ebx

        $sequence_8 = { 7507 be???????? eb2b 83f802 7507 be???????? eb1f }
            // n = 7, score = 300
            //   7507                 | jne                 9
            //   be????????           |                     
            //   eb2b                 | jmp                 0x2d
            //   83f802               | cmp                 eax, 2
            //   7507                 | jne                 9
            //   be????????           |                     
            //   eb1f                 | jmp                 0x21

        $sequence_9 = { 8db524fdffff e8???????? 53 8db5ecfcffff e8???????? }
            // n = 5, score = 300
            //   8db524fdffff         | lea                 esi, [ebp - 0x2dc]
            //   e8????????           |                     
            //   53                   | push                ebx
            //   8db5ecfcffff         | lea                 esi, [ebp - 0x314]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 204800
}