rule win_unidentified_081_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.unidentified_081."
        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.unidentified_081"
        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 = { 8b0485d0d14100 83c00c 03c7 50 ff15???????? 33c0 }
            // n = 6, score = 100
            //   8b0485d0d14100       | mov                 eax, dword ptr [eax*4 + 0x41d1d0]
            //   83c00c               | add                 eax, 0xc
            //   03c7                 | add                 eax, edi
            //   50                   | push                eax
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { ff248567694000 33c0 838dd8fdffffff 8bd8 8985a4fdffff 8985b4fdffff }
            // n = 6, score = 100
            //   ff248567694000       | jmp                 dword ptr [eax*4 + 0x406967]
            //   33c0                 | xor                 eax, eax
            //   838dd8fdffffff       | or                  dword ptr [ebp - 0x228], 0xffffffff
            //   8bd8                 | mov                 ebx, eax
            //   8985a4fdffff         | mov                 dword ptr [ebp - 0x25c], eax
            //   8985b4fdffff         | mov                 dword ptr [ebp - 0x24c], eax

        $sequence_2 = { 8d0c452ccb4100 8bc1 2d???????? d1f8 2bf0 56 51 }
            // n = 7, score = 100
            //   8d0c452ccb4100       | lea                 ecx, [eax*2 + 0x41cb2c]
            //   8bc1                 | mov                 eax, ecx
            //   2d????????           |                     
            //   d1f8                 | sar                 eax, 1
            //   2bf0                 | sub                 esi, eax
            //   56                   | push                esi
            //   51                   | push                ecx

        $sequence_3 = { ffd7 ff35???????? 8d85f8feffff 68???????? 6804010000 50 e8???????? }
            // n = 7, score = 100
            //   ffd7                 | call                edi
            //   ff35????????         |                     
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   68????????           |                     
            //   6804010000           | push                0x104
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { c745f4cc944100 50 e8???????? cc }
            // n = 4, score = 100
            //   c745f4cc944100       | mov                 dword ptr [ebp - 0xc], 0x4194cc
            //   50                   | push                eax
            //   e8????????           |                     
            //   cc                   | int3                

        $sequence_5 = { 7fdf 84db 0f854d010000 68???????? e9???????? 8b7b0c 8bcf }
            // n = 7, score = 100
            //   7fdf                 | jg                  0xffffffe1
            //   84db                 | test                bl, bl
            //   0f854d010000         | jne                 0x153
            //   68????????           |                     
            //   e9????????           |                     
            //   8b7b0c               | mov                 edi, dword ptr [ebx + 0xc]
            //   8bcf                 | mov                 ecx, edi

        $sequence_6 = { 53 8945f0 a1???????? 56 }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   a1????????           |                     
            //   56                   | push                esi

        $sequence_7 = { e8???????? 8bb598fdffff 83c404 8bbd90fdffff eb38 8d8dd0fdffff e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8bb598fdffff         | mov                 esi, dword ptr [ebp - 0x268]
            //   83c404               | add                 esp, 4
            //   8bbd90fdffff         | mov                 edi, dword ptr [ebp - 0x270]
            //   eb38                 | jmp                 0x3a
            //   8d8dd0fdffff         | lea                 ecx, [ebp - 0x230]
            //   e8????????           |                     

        $sequence_8 = { 6810040000 53 e8???????? 83c414 f685a4fdffff10 0f8487000000 6820080000 }
            // n = 7, score = 100
            //   6810040000           | push                0x410
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   f685a4fdffff10       | test                byte ptr [ebp - 0x25c], 0x10
            //   0f8487000000         | je                  0x8d
            //   6820080000           | push                0x820

        $sequence_9 = { b802000000 668945e8 0fb705???????? 50 ff15???????? 668945ea 8d45e8 }
            // n = 7, score = 100
            //   b802000000           | mov                 eax, 2
            //   668945e8             | mov                 word ptr [ebp - 0x18], ax
            //   0fb705????????       |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   668945ea             | mov                 word ptr [ebp - 0x16], ax
            //   8d45e8               | lea                 eax, [ebp - 0x18]

    condition:
        7 of them and filesize < 273408
}