rule win_molerat_loader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.molerat_loader."
        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.molerat_loader"
        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 = { 8d5584 52 c645fc16 e8???????? 83c40c 68???????? }
            // n = 6, score = 100
            //   8d5584               | lea                 edx, [ebp - 0x7c]
            //   52                   | push                edx
            //   c645fc16             | mov                 byte ptr [ebp - 4], 0x16
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   68????????           |                     

        $sequence_1 = { 33cd e8???????? 81c5ec030000 8be5 5d c3 8b4da8 }
            // n = 7, score = 100
            //   33cd                 | xor                 ecx, ebp
            //   e8????????           |                     
            //   81c5ec030000         | add                 ebp, 0x3ec
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b4da8               | mov                 ecx, dword ptr [ebp - 0x58]

        $sequence_2 = { 8b542410 8b42f4 85c0 0f84ba000000 8b4c2440 8d442414 50 }
            // n = 7, score = 100
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]
            //   8b42f4               | mov                 eax, dword ptr [edx - 0xc]
            //   85c0                 | test                eax, eax
            //   0f84ba000000         | je                  0xc0
            //   8b4c2440             | mov                 ecx, dword ptr [esp + 0x40]
            //   8d442414             | lea                 eax, [esp + 0x14]
            //   50                   | push                eax

        $sequence_3 = { c744241c00000000 c744243401000000 8b442440 8378f400 750e 68???????? 8d4c2444 }
            // n = 7, score = 100
            //   c744241c00000000     | mov                 dword ptr [esp + 0x1c], 0
            //   c744243401000000     | mov                 dword ptr [esp + 0x34], 1
            //   8b442440             | mov                 eax, dword ptr [esp + 0x40]
            //   8378f400             | cmp                 dword ptr [eax - 0xc], 0
            //   750e                 | jne                 0x10
            //   68????????           |                     
            //   8d4c2444             | lea                 ecx, [esp + 0x44]

        $sequence_4 = { 68???????? 8d55d8 52 c745d89cb64300 e8???????? 8b4508 8b4dec }
            // n = 7, score = 100
            //   68????????           |                     
            //   8d55d8               | lea                 edx, [ebp - 0x28]
            //   52                   | push                edx
            //   c745d89cb64300       | mov                 dword ptr [ebp - 0x28], 0x43b69c
            //   e8????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]

        $sequence_5 = { 7f0a 8b08 8b11 50 8b4204 ffd0 c645fc4a }
            // n = 7, score = 100
            //   7f0a                 | jg                  0xc
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   50                   | push                eax
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   ffd0                 | call                eax
            //   c645fc4a             | mov                 byte ptr [ebp - 4], 0x4a

        $sequence_6 = { 83c40c c645fc31 8b8548feffff 83c0f0 8d480c 83caff }
            // n = 6, score = 100
            //   83c40c               | add                 esp, 0xc
            //   c645fc31             | mov                 byte ptr [ebp - 4], 0x31
            //   8b8548feffff         | mov                 eax, dword ptr [ebp - 0x1b8]
            //   83c0f0               | add                 eax, -0x10
            //   8d480c               | lea                 ecx, [eax + 0xc]
            //   83caff               | or                  edx, 0xffffffff

        $sequence_7 = { 8bc6 c1f805 8b048520924400 83e61f c1e606 8d443004 }
            // n = 6, score = 100
            //   8bc6                 | mov                 eax, esi
            //   c1f805               | sar                 eax, 5
            //   8b048520924400       | mov                 eax, dword ptr [eax*4 + 0x449220]
            //   83e61f               | and                 esi, 0x1f
            //   c1e606               | shl                 esi, 6
            //   8d443004             | lea                 eax, [eax + esi + 4]

        $sequence_8 = { 7f0a 8b08 8b11 50 8b4204 ffd0 b36c }
            // n = 7, score = 100
            //   7f0a                 | jg                  0xc
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   50                   | push                eax
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   ffd0                 | call                eax
            //   b36c                 | mov                 bl, 0x6c

        $sequence_9 = { 83c0f0 c78424c80000000f000000 c78424c400000000000000 c68424b400000000 8d480c 83caff f00fc111 }
            // n = 7, score = 100
            //   83c0f0               | add                 eax, -0x10
            //   c78424c80000000f000000     | mov    dword ptr [esp + 0xc8], 0xf
            //   c78424c400000000000000     | mov    dword ptr [esp + 0xc4], 0
            //   c68424b400000000     | mov                 byte ptr [esp + 0xb4], 0
            //   8d480c               | lea                 ecx, [eax + 0xc]
            //   83caff               | or                  edx, 0xffffffff
            //   f00fc111             | lock xadd           dword ptr [ecx], edx

    condition:
        7 of them and filesize < 688128
}