rule win_graphsteel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.graphsteel."
        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.graphsteel"
        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 = { c7400c00000000 48c7401000000000 c7007e000000 4489542420 448b442450 4589f9 4889f9 }
            // n = 7, score = 100
            //   c7400c00000000       | lea                 eax, [0x1898]
            //   48c7401000000000     | dec                 eax
            //   c7007e000000         | mov                 dword ptr [esp + 0x38], 0
            //   4489542420           | dec                 eax
            //   448b442450           | mov                 dword ptr [esp + 0x40], 0
            //   4589f9               | dec                 eax
            //   4889f9               | mov                 dword ptr [esp + 0x48], 0

        $sequence_1 = { 4c898c24b8010000 4889bc24c0010000 4c8b9424b8010000 4d85d2 7422 450fb65a17 4589dc }
            // n = 7, score = 100
            //   4c898c24b8010000     | dec                 eax
            //   4889bc24c0010000     | lea                 ebp, [esp + 0xb0]
            //   4c8b9424b8010000     | dec                 ecx
            //   4d85d2               | mov                 ebp, 0
            //   7422                 | dec                 esp
            //   450fb65a17           | mov                 dword ptr [esp + 0xa8], ebp
            //   4589dc               | dec                 eax

        $sequence_2 = { e8???????? b801000000 89e9 d3e0 410985cc000000 83fd01 741a }
            // n = 7, score = 100
            //   e8????????           |                     
            //   b801000000           | mov                 dword ptr [esp + 0x40], esi
            //   89e9                 | dec                 eax
            //   d3e0                 | mov                 dword ptr [esp + 0x38], ecx
            //   410985cc000000       | dec                 eax
            //   83fd01               | lea                 eax, [0x289d70]
            //   741a                 | dec                 esp

        $sequence_3 = { f7466000ffff00 753b 8b96d4000000 c6466101 85d2 7e0a c7866001000001000000 }
            // n = 7, score = 100
            //   f7466000ffff00       | mov                 dword ptr [esp + 0x3a0], esi
            //   753b                 | dec                 eax
            //   8b96d4000000         | mov                 dword ptr [esp + 0x398], edi
            //   c6466101             | dec                 eax
            //   85d2                 | mov                 dword ptr [esp + 0x188], 0
            //   7e0a                 | dec                 eax
            //   c7866001000001000000     | mov    dword ptr [esp + 0x180], 0

        $sequence_4 = { bb16000000 e8???????? 4889842498020000 48899c2498010000 4889d9 4889c3 488d056e743e00 }
            // n = 7, score = 100
            //   bb16000000           | jmp                 0xd0f
            //   e8????????           |                     
            //   4889842498020000     | dec                 eax
            //   48899c2498010000     | lea                 edi, [0x863dfe]
            //   4889d9               | dec                 eax
            //   4889c3               | mov                 dword ptr [esp + 0x380], ecx
            //   488d056e743e00       | dec                 eax

        $sequence_5 = { ff5030 85c0 752a 48638bbc000000 488b442428 4801c8 4883e801 }
            // n = 7, score = 100
            //   ff5030               | lea                 eax, [0x2a5810]
            //   85c0                 | dec                 eax
            //   752a                 | mov                 ebx, dword ptr [esp + 0xb8]
            //   48638bbc000000       | dec                 esp
            //   488b442428           | mov                 ecx, esp
            //   4801c8               | dec                 esp
            //   4883e801             | mov                 edi, ecx

        $sequence_6 = { ffd0 488b6c2448 4883c450 c3 31c0 488d1df2193a00 b926000000 }
            // n = 7, score = 100
            //   ffd0                 | mov                 ecx, ebx
            //   488b6c2448           | dec                 eax
            //   4883c450             | mov                 ebx, eax
            //   c3                   | dec                 eax
            //   31c0                 | lea                 eax, [0x3e8ffa]
            //   488d1df2193a00       | dec                 eax
            //   b926000000           | test                eax, eax

        $sequence_7 = { 8b54244c 4c8b742430 4189c4 498916 4889d0 4180fc04 0f84dc000000 }
            // n = 7, score = 100
            //   8b54244c             | inc                 ebp
            //   4c8b742430           | mov                 ebx, eax
            //   4189c4               | dec                 eax
            //   498916               | test                ecx, ecx
            //   4889d0               | je                  0x1796
            //   4180fc04             | dec                 eax
            //   0f84dc000000         | sub                 esp, 0x30

        $sequence_8 = { c3 488d05c9d85e00 bb0a000000 0f1f440000 e8???????? 488b4c2428 890d???????? }
            // n = 7, score = 100
            //   c3                   | nop                 
            //   488d05c9d85e00       | mov                 word ptr [esp + 0x1e], 0xff
            //   bb0a000000           | dec                 eax
            //   0f1f440000           | mov                 dword ptr [eax], edx
            //   e8????????           |                     
            //   488b4c2428           | jmp                 0x12fd
            //   890d????????         |                     

        $sequence_9 = { eb0c 488d3df63c8600 e8???????? 488b0d???????? 48898c2498030000 488d05f3085500 e8???????? }
            // n = 7, score = 100
            //   eb0c                 | dec                 ebp
            //   488d3df63c8600       | test                edx, edx
            //   e8????????           |                     
            //   488b0d????????       |                     
            //   48898c2498030000     | dec                 eax
            //   488d05f3085500       | mov                 dword ptr [esp + 0xf8], eax
            //   e8????????           |                     

    condition:
        7 of them and filesize < 19812352
}