rule win_concealment_troy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 33c0 5f 5e 5b 8b8c24580d0000 33cc }
            // n = 6, score = 100
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   8b8c24580d0000       | mov                 ecx, dword ptr [esp + 0xd58]
            //   33cc                 | xor                 ecx, esp

        $sequence_1 = { 741d 8bc7 c1f805 83e71f c1e706 8b0485a0774100 }
            // n = 6, score = 100
            //   741d                 | je                  0x1f
            //   8bc7                 | mov                 eax, edi
            //   c1f805               | sar                 eax, 5
            //   83e71f               | and                 edi, 0x1f
            //   c1e706               | shl                 edi, 6
            //   8b0485a0774100       | mov                 eax, dword ptr [eax*4 + 0x4177a0]

        $sequence_2 = { e8???????? 8b542410 56 52 8d442434 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]
            //   56                   | push                esi
            //   52                   | push                edx
            //   8d442434             | lea                 eax, [esp + 0x34]

        $sequence_3 = { 7523 57 e8???????? 83c404 5f 5e }
            // n = 6, score = 100
            //   7523                 | jne                 0x25
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_4 = { 33ff 897dfc 3b1cfd40564100 7409 47 897dfc }
            // n = 6, score = 100
            //   33ff                 | xor                 edi, edi
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   3b1cfd40564100       | cmp                 ebx, dword ptr [edi*8 + 0x415640]
            //   7409                 | je                  0xb
            //   47                   | inc                 edi
            //   897dfc               | mov                 dword ptr [ebp - 4], edi

        $sequence_5 = { 53 897c242c e8???????? 8bf0 83c408 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   897c242c             | mov                 dword ptr [esp + 0x2c], edi
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c408               | add                 esp, 8

        $sequence_6 = { 8bd8 8bc8 8a141e 02ca 020c07 40 32ed }
            // n = 7, score = 100
            //   8bd8                 | mov                 ebx, eax
            //   8bc8                 | mov                 ecx, eax
            //   8a141e               | mov                 dl, byte ptr [esi + ebx]
            //   02ca                 | add                 cl, dl
            //   020c07               | add                 cl, byte ptr [edi + eax]
            //   40                   | inc                 eax
            //   32ed                 | xor                 ch, ch

        $sequence_7 = { 5b 8b8c2478130000 33cc e8???????? 81c47c130000 c3 8b542414 }
            // n = 7, score = 100
            //   5b                   | pop                 ebx
            //   8b8c2478130000       | mov                 ecx, dword ptr [esp + 0x1378]
            //   33cc                 | xor                 ecx, esp
            //   e8????????           |                     
            //   81c47c130000         | add                 esp, 0x137c
            //   c3                   | ret                 
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]

        $sequence_8 = { 85ed 7521 57 ff15???????? 5d 5f }
            // n = 6, score = 100
            //   85ed                 | test                ebp, ebp
            //   7521                 | jne                 0x23
            //   57                   | push                edi
            //   ff15????????         |                     
            //   5d                   | pop                 ebp
            //   5f                   | pop                 edi

        $sequence_9 = { 8b1495a0774100 c1e006 8d440224 802080 884dfd 8065fd48 884dff }
            // n = 7, score = 100
            //   8b1495a0774100       | mov                 edx, dword ptr [edx*4 + 0x4177a0]
            //   c1e006               | shl                 eax, 6
            //   8d440224             | lea                 eax, [edx + eax + 0x24]
            //   802080               | and                 byte ptr [eax], 0x80
            //   884dfd               | mov                 byte ptr [ebp - 3], cl
            //   8065fd48             | and                 byte ptr [ebp - 3], 0x48
            //   884dff               | mov                 byte ptr [ebp - 1], cl

    condition:
        7 of them and filesize < 229376
}