rule win_lunchmoney_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.lunchmoney."
        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.lunchmoney"
        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 = { 03fe 3bfb 0f8ed1fdffff 33db 8d4db4 53 }
            // n = 6, score = 100
            //   03fe                 | add                 edi, esi
            //   3bfb                 | cmp                 edi, ebx
            //   0f8ed1fdffff         | jle                 0xfffffdd7
            //   33db                 | xor                 ebx, ebx
            //   8d4db4               | lea                 ecx, [ebp - 0x4c]
            //   53                   | push                ebx

        $sequence_1 = { f685acfeffff10 0f8494000000 8d8dd0feffff 80392e 750c 0fb64101 84c0 }
            // n = 7, score = 100
            //   f685acfeffff10       | test                byte ptr [ebp - 0x154], 0x10
            //   0f8494000000         | je                  0x9a
            //   8d8dd0feffff         | lea                 ecx, [ebp - 0x130]
            //   80392e               | cmp                 byte ptr [ecx], 0x2e
            //   750c                 | jne                 0xe
            //   0fb64101             | movzx               eax, byte ptr [ecx + 1]
            //   84c0                 | test                al, al

        $sequence_2 = { c745f008f04100 50 e8???????? cc 55 8bec 83ec0c }
            // n = 7, score = 100
            //   c745f008f04100       | mov                 dword ptr [ebp - 0x10], 0x41f008
            //   50                   | push                eax
            //   e8????????           |                     
            //   cc                   | int3                
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec0c               | sub                 esp, 0xc

        $sequence_3 = { 8d4db4 8d95f0feffff 0f434db4 e8???????? }
            // n = 4, score = 100
            //   8d4db4               | lea                 ecx, [ebp - 0x4c]
            //   8d95f0feffff         | lea                 edx, [ebp - 0x110]
            //   0f434db4             | cmovae              ecx, dword ptr [ebp - 0x4c]
            //   e8????????           |                     

        $sequence_4 = { ff37 e8???????? 33c0 59 8907 894704 894708 }
            // n = 7, score = 100
            //   ff37                 | push                dword ptr [edi]
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx
            //   8907                 | mov                 dword ptr [edi], eax
            //   894704               | mov                 dword ptr [edi + 4], eax
            //   894708               | mov                 dword ptr [edi + 8], eax

        $sequence_5 = { 8b9524e5ffff 8b0c9d50914200 88440a34 8b049d50914200 }
            // n = 4, score = 100
            //   8b9524e5ffff         | mov                 edx, dword ptr [ebp - 0x1adc]
            //   8b0c9d50914200       | mov                 ecx, dword ptr [ebx*4 + 0x429150]
            //   88440a34             | mov                 byte ptr [edx + ecx + 0x34], al
            //   8b049d50914200       | mov                 eax, dword ptr [ebx*4 + 0x429150]

        $sequence_6 = { 8a02 8b9524e5ffff 8b0c9d50914200 88440a34 8b049d50914200 }
            // n = 5, score = 100
            //   8a02                 | mov                 al, byte ptr [edx]
            //   8b9524e5ffff         | mov                 edx, dword ptr [ebp - 0x1adc]
            //   8b0c9d50914200       | mov                 ecx, dword ptr [ebx*4 + 0x429150]
            //   88440a34             | mov                 byte ptr [edx + ecx + 0x34], al
            //   8b049d50914200       | mov                 eax, dword ptr [ebx*4 + 0x429150]

        $sequence_7 = { c786040b000080384200 c786080b000098394200 c7860c0b0000083a4200 c786100b0000d03a4200 c786140b0000f03b4200 e8???????? 8b7d08 }
            // n = 7, score = 100
            //   c786040b000080384200     | mov    dword ptr [esi + 0xb04], 0x423880
            //   c786080b000098394200     | mov    dword ptr [esi + 0xb08], 0x423998
            //   c7860c0b0000083a4200     | mov    dword ptr [esi + 0xb0c], 0x423a08
            //   c786100b0000d03a4200     | mov    dword ptr [esi + 0xb10], 0x423ad0
            //   c786140b0000f03b4200     | mov    dword ptr [esi + 0xb14], 0x423bf0
            //   e8????????           |                     
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

        $sequence_8 = { f3a4 50 e8???????? 8bb5e0feffff 59 59 8b8de8feffff }
            // n = 7, score = 100
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bb5e0feffff         | mov                 esi, dword ptr [ebp - 0x120]
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   8b8de8feffff         | mov                 ecx, dword ptr [ebp - 0x118]

        $sequence_9 = { 53 56 57 8bf9 83ec18 8bcc ffb7f40a0000 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bf9                 | mov                 edi, ecx
            //   83ec18               | sub                 esp, 0x18
            //   8bcc                 | mov                 ecx, esp
            //   ffb7f40a0000         | push                dword ptr [edi + 0xaf4]

    condition:
        7 of them and filesize < 373760
}