rule win_fakeword_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.fakeword."
        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.fakeword"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8d7704 885f05 c60653 eb76 8b0d???????? 55 03c8 }
            // n = 7, score = 200
            //   8d7704               | lea                 esi, [edi + 4]
            //   885f05               | mov                 byte ptr [edi + 5], bl
            //   c60653               | mov                 byte ptr [esi], 0x53
            //   eb76                 | jmp                 0x78
            //   8b0d????????         |                     
            //   55                   | push                ebp
            //   03c8                 | add                 ecx, eax

        $sequence_1 = { 57 ffd6 8d542410 8be8 52 ffd6 03e8 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   8d542410             | lea                 edx, [esp + 0x10]
            //   8be8                 | mov                 ebp, eax
            //   52                   | push                edx
            //   ffd6                 | call                esi
            //   03e8                 | add                 ebp, eax

        $sequence_2 = { c3 81fea3000000 7528 a1???????? 85c0 0f84dd010000 8b4c2450 }
            // n = 7, score = 200
            //   c3                   | ret                 
            //   81fea3000000         | cmp                 esi, 0xa3
            //   7528                 | jne                 0x2a
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   0f84dd010000         | je                  0x1e3
            //   8b4c2450             | mov                 ecx, dword ptr [esp + 0x50]

        $sequence_3 = { eb3b 8b542450 68???????? 52 ff15???????? 5f b801000000 }
            // n = 7, score = 200
            //   eb3b                 | jmp                 0x3d
            //   8b542450             | mov                 edx, dword ptr [esp + 0x50]
            //   68????????           |                     
            //   52                   | push                edx
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   b801000000           | mov                 eax, 1

        $sequence_4 = { 8d4801 890e 8b15???????? 2bd0 8915???????? e8???????? a1???????? }
            // n = 7, score = 200
            //   8d4801               | lea                 ecx, [eax + 1]
            //   890e                 | mov                 dword ptr [esi], ecx
            //   8b15????????         |                     
            //   2bd0                 | sub                 edx, eax
            //   8915????????         |                     
            //   e8????????           |                     
            //   a1????????           |                     

        $sequence_5 = { 59 c3 8b54241c 52 e8???????? }
            // n = 5, score = 200
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   8b54241c             | mov                 edx, dword ptr [esp + 0x1c]
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_6 = { 68???????? e9???????? 8b542450 68???????? 52 ff15???????? }
            // n = 6, score = 200
            //   68????????           |                     
            //   e9????????           |                     
            //   8b542450             | mov                 edx, dword ptr [esp + 0x50]
            //   68????????           |                     
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_7 = { 85c0 7d10 56 ff15???????? 5f 83c8ff }
            // n = 6, score = 200
            //   85c0                 | test                eax, eax
            //   7d10                 | jge                 0x12
            //   56                   | push                esi
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_8 = { 8b442450 68???????? 50 ff15???????? 5f b801000000 5e }
            // n = 7, score = 200
            //   8b442450             | mov                 eax, dword ptr [esp + 0x50]
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   b801000000           | mov                 eax, 1
            //   5e                   | pop                 esi

        $sequence_9 = { f3ab b801000000 8d4c2408 8944245c 89442440 89442424 89442408 }
            // n = 7, score = 200
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   b801000000           | mov                 eax, 1
            //   8d4c2408             | lea                 ecx, [esp + 8]
            //   8944245c             | mov                 dword ptr [esp + 0x5c], eax
            //   89442440             | mov                 dword ptr [esp + 0x40], eax
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   89442408             | mov                 dword ptr [esp + 8], eax

    condition:
        7 of them and filesize < 98304
}