rule win_lunchmoney_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "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 = { 8bf1 894d80 c1e60a 56 e8???????? 56 8bf8 }
            // n = 7, score = 100
            //   8bf1                 | mov                 esi, ecx
            //   894d80               | mov                 dword ptr [ebp - 0x80], ecx
            //   c1e60a               | shl                 esi, 0xa
            //   56                   | push                esi
            //   e8????????           |                     
            //   56                   | push                esi
            //   8bf8                 | mov                 edi, eax

        $sequence_1 = { e8???????? c645fc03 8d4dd8 837dec10 8d5598 0f434dd8 e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   837dec10             | cmp                 dword ptr [ebp - 0x14], 0x10
            //   8d5598               | lea                 edx, [ebp - 0x68]
            //   0f434dd8             | cmovae              ecx, dword ptr [ebp - 0x28]
            //   e8????????           |                     

        $sequence_2 = { 51 50 ff7518 51 8d4d08 e8???????? }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   50                   | push                eax
            //   ff7518               | push                dword ptr [ebp + 0x18]
            //   51                   | push                ecx
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   e8????????           |                     

        $sequence_3 = { 8bcf 83e71f c1f905 c1e706 8b0c8d50914200 c644390400 }
            // n = 6, score = 100
            //   8bcf                 | mov                 ecx, edi
            //   83e71f               | and                 edi, 0x1f
            //   c1f905               | sar                 ecx, 5
            //   c1e706               | shl                 edi, 6
            //   8b0c8d50914200       | mov                 ecx, dword ptr [ecx*4 + 0x429150]
            //   c644390400           | mov                 byte ptr [ecx + edi + 4], 0

        $sequence_4 = { 33db 895de8 c745fc02000000 8d4520 }
            // n = 4, score = 100
            //   33db                 | xor                 ebx, ebx
            //   895de8               | mov                 dword ptr [ebp - 0x18], ebx
            //   c745fc02000000       | mov                 dword ptr [ebp - 4], 2
            //   8d4520               | lea                 eax, [ebp + 0x20]

        $sequence_5 = { 83e11f c1e106 8b048550914200 c644080401 }
            // n = 4, score = 100
            //   83e11f               | and                 ecx, 0x1f
            //   c1e106               | shl                 ecx, 6
            //   8b048550914200       | mov                 eax, dword ptr [eax*4 + 0x429150]
            //   c644080401           | mov                 byte ptr [eax + ecx + 4], 1

        $sequence_6 = { 8bcf 83e71f c1f905 c1e706 8b0c8d50914200 c644390400 85f6 }
            // n = 7, score = 100
            //   8bcf                 | mov                 ecx, edi
            //   83e71f               | and                 edi, 0x1f
            //   c1f905               | sar                 ecx, 5
            //   c1e706               | shl                 edi, 6
            //   8b0c8d50914200       | mov                 ecx, dword ptr [ecx*4 + 0x429150]
            //   c644390400           | mov                 byte ptr [ecx + edi + 4], 0
            //   85f6                 | test                esi, esi

        $sequence_7 = { 53 57 8d8ef8000000 e8???????? }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   57                   | push                edi
            //   8d8ef8000000         | lea                 ecx, [esi + 0xf8]
            //   e8????????           |                     

        $sequence_8 = { 8d55ec e8???????? 8d55ec 8bc8 e8???????? 8d55ec 8bc8 }
            // n = 7, score = 100
            //   8d55ec               | lea                 edx, [ebp - 0x14]
            //   e8????????           |                     
            //   8d55ec               | lea                 edx, [ebp - 0x14]
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   8d55ec               | lea                 edx, [ebp - 0x14]
            //   8bc8                 | mov                 ecx, eax

        $sequence_9 = { 56 8bf1 57 8b5610 3bd3 0f82c6020000 8b7d10 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi
            //   8b5610               | mov                 edx, dword ptr [esi + 0x10]
            //   3bd3                 | cmp                 edx, ebx
            //   0f82c6020000         | jb                  0x2cc
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]

    condition:
        7 of them and filesize < 373760
}