rule win_graphsteel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "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 = { eb0d 4889c7 488b542470 e8???????? 31db 488d0da84f5b00 4889c7 }
            // n = 7, score = 100
            //   eb0d                 | dec                 eax
            //   4889c7               | mov                 dword ptr [eax + 0xb8], 4
            //   488b542470           | dec                 eax
            //   e8????????           |                     
            //   31db                 | mov                 dword ptr [eax + 0x80], edx
            //   488d0da84f5b00       | jmp                 0x7d
            //   4889c7               | dec                 eax

        $sequence_1 = { eb11 488d7818 488b8c24f0000000 e8???????? 48c740101c000000 488d0d0d555300 48894808 }
            // n = 7, score = 100
            //   eb11                 | mov                 dword ptr [esp + 0xc0], edx
            //   488d7818             | dec                 eax
            //   488b8c24f0000000     | mov                 dword ptr [esp + 0xc8], eax
            //   e8????????           |                     
            //   48c740101c000000     | dec                 eax
            //   488d0d0d555300       | mov                 eax, dword ptr [esp + 0xb0]
            //   48894808             | dec                 eax

        $sequence_2 = { e8???????? 448b5c2478 4585db 0f859de1ffff 488b9424b8000000 4889d9 bd02000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   448b5c2478           | nop                 
            //   4585db               | dec                 eax
            //   0f859de1ffff         | mov                 dword ptr [eax + 0x10], ecx
            //   488b9424b8000000     | dec                 eax
            //   4889d9               | mov                 ebx, eax
            //   bd02000000           | dec                 eax

        $sequence_3 = { 898424b0000000 413b8594000000 0f8d34060000 48638424b0000000 8d5001 488d0c40 498b8588000000 }
            // n = 7, score = 100
            //   898424b0000000       | dec                 eax
            //   413b8594000000       | lea                 eax, [0x8e760f]
            //   0f8d34060000         | nop                 
            //   48638424b0000000     | dec                 eax
            //   8d5001               | add                 esp, 0x50
            //   488d0c40             | ret                 
            //   498b8588000000       | mov                 eax, 1

        $sequence_4 = { e8???????? 488b6d00 e9???????? 31c0 488bac2428020000 4881c430020000 c3 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488b6d00             | lea                 eax, [0x90e89b]
            //   e9????????           |                     
            //   31c0                 | dec                 eax
            //   488bac2428020000     | mov                 dword ptr [esp + 0x10], edx
            //   4881c430020000       | dec                 eax
            //   c3                   | mov                 eax, dword ptr [esp + 0x68]

        $sequence_5 = { ff05???????? 4889f8 4883f836 7d48 488d150f9c5c00 0fb63402 81fe80000000 }
            // n = 7, score = 100
            //   ff05????????         |                     
            //   4889f8               | jne                 0xd1d
            //   4883f836             | dec                 eax
            //   7d48                 | lea                 edx, [0x504cc5]
            //   488d150f9c5c00       | dec                 eax
            //   0fb63402             | mov                 dword ptr [esp + 0xb0], edi
            //   81fe80000000         | dec                 eax

        $sequence_6 = { e9???????? 8b8424a0010000 4189d9 ba35000000 4c89e9 448b842498010000 41bf06000000 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8b8424a0010000       | dec                 eax
            //   4189d9               | mov                 dword ptr [esp + 0x128], ecx
            //   ba35000000           | dec                 eax
            //   4c89e9               | lea                 eax, [0x208f2c]
            //   448b842498010000     | dec                 eax
            //   41bf06000000         | mov                 ebx, eax

        $sequence_7 = { eb09 488d7848 e8???????? 440f117c2478 488d35459d5000 4889742468 4889442470 }
            // n = 7, score = 100
            //   eb09                 | mov                 esp, ecx
            //   488d7848             | dec                 eax
            //   e8????????           |                     
            //   440f117c2478         | mov                 edi, edx
            //   488d35459d5000       | dec                 eax
            //   4889742468           | mov                 dword ptr [esp + 0xb0], ecx
            //   4889442470           | dec                 eax

        $sequence_8 = { eb0c 488dbbe0100000 e8???????? 833d????????00 7510 488d05f6c14100 488983c0100000 }
            // n = 7, score = 100
            //   eb0c                 | mov                 dword ptr [esp + 0x110], ecx
            //   488dbbe0100000       | dec                 eax
            //   e8????????           |                     
            //   833d????????00       |                     
            //   7510                 | lea                 eax, [0x45bf61]
            //   488d05f6c14100       | dec                 eax
            //   488983c0100000       | mov                 dword ptr [esp + 0xf8], ecx

        $sequence_9 = { e9???????? 81f9eb5dd1d7 7527 488d0d80875000 4839c8 754b 488b0b }
            // n = 7, score = 100
            //   e9????????           |                     
            //   81f9eb5dd1d7         | mov                 dword ptr [esp + 0x110], ecx
            //   7527                 | dec                 eax
            //   488d0d80875000       | mov                 dword ptr [esp + 0x118], edx
            //   4839c8               | inc                 esp
            //   754b                 | mov                 dword ptr [esp + 0x120], eax
            //   488b0b               | dec                 esp

    condition:
        7 of them and filesize < 19812352
}