rule win_theme_forest_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.theme_forest_rat."
        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.theme_forest_rat"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 488bcb e8???????? 85c0 0f859d000000 bfffff0000 448bc7 4839bb58010100 }
            // n = 7, score = 100
            //   488bcb               | dec                 esp
            //   e8????????           |                     
            //   85c0                 | lea                 eax, [ebp + 0x10]
            //   0f859d000000         | mov                 edx, edi
            //   bfffff0000           | dec                 eax
            //   448bc7               | mov                 ecx, ebx
            //   4839bb58010100       | test                eax, eax

        $sequence_1 = { 4885c9 7417 33d2 498bc0 48f7f1 4883f802 0f82c6000000 }
            // n = 7, score = 100
            //   4885c9               | inc                 ecx
            //   7417                 | mov                 eax, 0x400
            //   33d2                 | dec                 eax
            //   498bc0               | lea                 ecx, [0x29c9d]
            //   48f7f1               | dec                 eax
            //   4883f802             | mov                 ecx, eax
            //   0f82c6000000         | dec                 eax

        $sequence_2 = { 33c9 e8???????? 488bc8 ff15???????? e9???????? b920b00400 e8???????? }
            // n = 7, score = 100
            //   33c9                 | dec                 eax
            //   e8????????           |                     
            //   488bc8               | test                ebx, ebx
            //   ff15????????         |                     
            //   e9????????           |                     
            //   b920b00400           | jne                 0x907
            //   e8????????           |                     

        $sequence_3 = { 488d1446 4d8bc6 488bcb e8???????? 6646892c73 4c89ac24c8000000 440fb7c7 }
            // n = 7, score = 100
            //   488d1446             | inc                 ecx
            //   4d8bc6               | mov                 eax, 3
            //   488bcb               | dec                 eax
            //   e8????????           |                     
            //   6646892c73           | lea                 edx, [0x121cf]
            //   4c89ac24c8000000     | cmp                 word ptr [eax], si
            //   440fb7c7             | jne                 0x6cd

        $sequence_4 = { 488d15fbcc0100 488d0de4cc0100 e8???????? c705????????02000000 eb08 40b601 4088742420 }
            // n = 7, score = 100
            //   488d15fbcc0100       | test                ax, ax
            //   488d0de4cc0100       | jne                 0x11fe
            //   e8????????           |                     
            //   c705????????02000000     |     
            //   eb08                 | dec                 esp
            //   40b601               | mov                 eax, ebx
            //   4088742420           | xor                 edx, edx

        $sequence_5 = { 488bc3 488b4b10 80791900 0f85cb000000 488bd9 488b09 }
            // n = 6, score = 100
            //   488bc3               | mov                 dword ptr [ecx + 0x28], eax
            //   488b4b10             | jne                 0x44c
            //   80791900             | dec                 eax
            //   0f85cb000000         | lea                 ecx, [0x2ccb9]
            //   488bd9               | inc                 ecx
            //   488b09               | mov                 ecx, dword ptr [esi + 4]

        $sequence_6 = { 6683f83d 0f8586000000 4883c702 66443937 74f6 41b805000000 488d1593210100 }
            // n = 7, score = 100
            //   6683f83d             | mov                 esi, eax
            //   0f8586000000         | cmp                 dword ptr [esi], 1
            //   4883c702             | mov                 ecx, 0x40
            //   66443937             | inc                 ecx
            //   74f6                 | mov                 ebx, ecx
            //   41b805000000         | dec                 ecx
            //   488d1593210100       | mov                 edi, eax

        $sequence_7 = { 48895c2408 48896c2410 4889742418 57 4883ec40 8d821802ffff 8bf2 }
            // n = 7, score = 100
            //   48895c2408           | je                  0xea5
            //   48896c2410           | dec                 eax
            //   4889742418           | lea                 ecx, [eax + 1]
            //   57                   | dec                 eax
            //   4883ec40             | test                ecx, ecx
            //   8d821802ffff         | je                  0xdff
            //   8bf2                 | xor                 edx, edx

        $sequence_8 = { e8???????? 482be0 4c8d9570010000 498bf8 4c2bd2 488bf2 4533ff }
            // n = 7, score = 100
            //   e8????????           |                     
            //   482be0               | dec                 eax
            //   4c8d9570010000       | mov                 dword ptr [ebx + 0x48], ecx
            //   498bf8               | xor                 eax, eax
            //   4c2bd2               | xorps               xmm0, xmm0
            //   488bf2               | dec                 eax
            //   4533ff               | mov                 dword ptr [esp + 0x78], eax

        $sequence_9 = { 33c0 e9???????? 33c0 e9???????? bb00040000 482bc1 483bc3 }
            // n = 7, score = 100
            //   33c0                 | sar                 edx, 6
            //   e9????????           |                     
            //   33c0                 | dec                 esp
            //   e9????????           |                     
            //   bb00040000           | mov                 dword ptr [ebx + eax], esi
            //   482bc1               | dec                 eax
            //   483bc3               | mov                 eax, ebp

    condition:
        7 of them and filesize < 651264
}