rule win_mmon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.mmon."
        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.mmon"
        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 = { 7524 a1???????? a3???????? a1???????? c705????????c8234100 }
            // n = 5, score = 100
            //   7524                 | jne                 0x26
            //   a1????????           |                     
            //   a3????????           |                     
            //   a1????????           |                     
            //   c705????????c8234100     |     

        $sequence_1 = { 8945fc 8bcf 8d45d4 e8???????? }
            // n = 4, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8bcf                 | mov                 ecx, edi
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   e8????????           |                     

        $sequence_2 = { 89480c 8b45d0 8975e0 3975e4 7303 }
            // n = 5, score = 100
            //   89480c               | mov                 dword ptr [eax + 0xc], ecx
            //   8b45d0               | mov                 eax, dword ptr [ebp - 0x30]
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   3975e4               | cmp                 dword ptr [ebp - 0x1c], esi
            //   7303                 | jae                 5

        $sequence_3 = { 68???????? 56 897dfc 89bd4cffffff 898d50ffffff }
            // n = 5, score = 100
            //   68????????           |                     
            //   56                   | push                esi
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   89bd4cffffff         | mov                 dword ptr [ebp - 0xb4], edi
            //   898d50ffffff         | mov                 dword ptr [ebp - 0xb0], ecx

        $sequence_4 = { 52 e8???????? 83c404 bb08000000 837de410 }
            // n = 5, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   bb08000000           | mov                 ebx, 8
            //   837de410             | cmp                 dword ptr [ebp - 0x1c], 0x10

        $sequence_5 = { 40 0080af4000a4 af 40 }
            // n = 4, score = 100
            //   40                   | inc                 eax
            //   0080af4000a4         | add                 byte ptr [eax - 0x5bffbf51], al
            //   af                   | scasd               eax, dword ptr es:[edi]
            //   40                   | inc                 eax

        $sequence_6 = { c1f905 83e01f c1e006 03048d606a4200 eb05 b8???????? f6402480 }
            // n = 7, score = 100
            //   c1f905               | sar                 ecx, 5
            //   83e01f               | and                 eax, 0x1f
            //   c1e006               | shl                 eax, 6
            //   03048d606a4200       | add                 eax, dword ptr [ecx*4 + 0x426a60]
            //   eb05                 | jmp                 7
            //   b8????????           |                     
            //   f6402480             | test                byte ptr [eax + 0x24], 0x80

        $sequence_7 = { 897c2424 c74424141ce34100 e8???????? f6c102 }
            // n = 4, score = 100
            //   897c2424             | mov                 dword ptr [esp + 0x24], edi
            //   c74424141ce34100     | mov                 dword ptr [esp + 0x14], 0x41e31c
            //   e8????????           |                     
            //   f6c102               | test                cl, 2

        $sequence_8 = { 83c404 c645fc00 837dc810 c745e40f000000 c745e000000000 c645d000 }
            // n = 6, score = 100
            //   83c404               | add                 esp, 4
            //   c645fc00             | mov                 byte ptr [ebp - 4], 0
            //   837dc810             | cmp                 dword ptr [ebp - 0x38], 0x10
            //   c745e40f000000       | mov                 dword ptr [ebp - 0x1c], 0xf
            //   c745e000000000       | mov                 dword ptr [ebp - 0x20], 0
            //   c645d000             | mov                 byte ptr [ebp - 0x30], 0

        $sequence_9 = { 8d541246 51 2bc2 8d4db4 }
            // n = 4, score = 100
            //   8d541246             | lea                 edx, [edx + edx + 0x46]
            //   51                   | push                ecx
            //   2bc2                 | sub                 eax, edx
            //   8d4db4               | lea                 ecx, [ebp - 0x4c]

    condition:
        7 of them and filesize < 356352
}