rule win_concealment_troy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.concealment_troy."
        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.concealment_troy"
        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 = { c1f905 8d1c8da0774100 8bf8 83e71f c1e706 8b0b }
            // n = 6, score = 100
            //   c1f905               | sar                 ecx, 5
            //   8d1c8da0774100       | lea                 ebx, [ecx*4 + 0x4177a0]
            //   8bf8                 | mov                 edi, eax
            //   83e71f               | and                 edi, 0x1f
            //   c1e706               | shl                 edi, 6
            //   8b0b                 | mov                 ecx, dword ptr [ebx]

        $sequence_1 = { 8bc2 0aff 74df 8b8d90000000 }
            // n = 4, score = 100
            //   8bc2                 | mov                 eax, edx
            //   0aff                 | or                  bh, bh
            //   74df                 | je                  0xffffffe1
            //   8b8d90000000         | mov                 ecx, dword ptr [ebp + 0x90]

        $sequence_2 = { 83c40c c744240800000000 85f6 743b 8b16 }
            // n = 5, score = 100
            //   83c40c               | add                 esp, 0xc
            //   c744240800000000     | mov                 dword ptr [esp + 8], 0
            //   85f6                 | test                esi, esi
            //   743b                 | je                  0x3d
            //   8b16                 | mov                 edx, dword ptr [esi]

        $sequence_3 = { 33c4 89842420010000 8b842428010000 56 57 8944240c 33c0 }
            // n = 7, score = 100
            //   33c4                 | xor                 eax, esp
            //   89842420010000       | mov                 dword ptr [esp + 0x120], eax
            //   8b842428010000       | mov                 eax, dword ptr [esp + 0x128]
            //   56                   | push                esi
            //   57                   | push                edi
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 837ddc00 75e6 c6460401 830eff 2b34bda0774100 c1fe06 }
            // n = 6, score = 100
            //   837ddc00             | cmp                 dword ptr [ebp - 0x24], 0
            //   75e6                 | jne                 0xffffffe8
            //   c6460401             | mov                 byte ptr [esi + 4], 1
            //   830eff               | or                  dword ptr [esi], 0xffffffff
            //   2b34bda0774100       | sub                 esi, dword ptr [edi*4 + 0x4177a0]
            //   c1fe06               | sar                 esi, 6

        $sequence_5 = { 33db 83c408 3bf3 751a }
            // n = 4, score = 100
            //   33db                 | xor                 ebx, ebx
            //   83c408               | add                 esp, 8
            //   3bf3                 | cmp                 esi, ebx
            //   751a                 | jne                 0x1c

        $sequence_6 = { 51 ff15???????? 0fb745d8 99 b964000000 f7f9 0fb745de }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   0fb745d8             | movzx               eax, word ptr [ebp - 0x28]
            //   99                   | cdq                 
            //   b964000000           | mov                 ecx, 0x64
            //   f7f9                 | idiv                ecx
            //   0fb745de             | movzx               eax, word ptr [ebp - 0x22]

        $sequence_7 = { 8d842420010000 e8???????? 8d542418 8d9b00000000 8a08 880a }
            // n = 6, score = 100
            //   8d842420010000       | lea                 eax, [esp + 0x120]
            //   e8????????           |                     
            //   8d542418             | lea                 edx, [esp + 0x18]
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   880a                 | mov                 byte ptr [edx], cl

        $sequence_8 = { 8d44242c 57 50 e8???????? 57 8d8c243c010000 }
            // n = 6, score = 100
            //   8d44242c             | lea                 eax, [esp + 0x2c]
            //   57                   | push                edi
            //   50                   | push                eax
            //   e8????????           |                     
            //   57                   | push                edi
            //   8d8c243c010000       | lea                 ecx, [esp + 0x13c]

        $sequence_9 = { 8d942468020000 83c40c 8bc6 2bd6 }
            // n = 4, score = 100
            //   8d942468020000       | lea                 edx, [esp + 0x268]
            //   83c40c               | add                 esp, 0xc
            //   8bc6                 | mov                 eax, esi
            //   2bd6                 | sub                 edx, esi

    condition:
        7 of them and filesize < 229376
}