rule win_exaramel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.exaramel."
        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.exaramel"
        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 = { 8d45ec c745ec00000000 50 ff7508 57 e8???????? }
            // n = 6, score = 100
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_1 = { e8???????? ff75f8 e8???????? 8b06 83c410 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   e8????????           |                     
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   83c410               | add                 esp, 0x10

        $sequence_2 = { b801000000 68f0030000 0f42f0 8d45f4 50 57 }
            // n = 6, score = 100
            //   b801000000           | mov                 eax, 1
            //   68f0030000           | push                0x3f0
            //   0f42f0               | cmovb               esi, eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   57                   | push                edi

        $sequence_3 = { 8b01 51 8b4008 ffd0 a1???????? }
            // n = 5, score = 100
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   51                   | push                ecx
            //   8b4008               | mov                 eax, dword ptr [eax + 8]
            //   ffd0                 | call                eax
            //   a1????????           |                     

        $sequence_4 = { 6bf630 8b04bd60dd4100 f644302880 741f e8???????? }
            // n = 5, score = 100
            //   6bf630               | imul                esi, esi, 0x30
            //   8b04bd60dd4100       | mov                 eax, dword ptr [edi*4 + 0x41dd60]
            //   f644302880           | test                byte ptr [eax + esi + 0x28], 0x80
            //   741f                 | je                  0x21
            //   e8????????           |                     

        $sequence_5 = { 50 ff15???????? 85c0 7527 56 6a00 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7527                 | jne                 0x29
            //   56                   | push                esi
            //   6a00                 | push                0

        $sequence_6 = { 85f6 7425 8d4e02 51 e8???????? 8b4d0c }
            // n = 6, score = 100
            //   85f6                 | test                esi, esi
            //   7425                 | je                  0x27
            //   8d4e02               | lea                 ecx, [esi + 2]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]

        $sequence_7 = { ff15???????? 85c0 740a 6a01 e8???????? 83c404 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc
            //   6a01                 | push                1
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_8 = { ff35???????? c705????????00000000 c705????????01000000 c705????????00000000 c705????????03000000 ff15???????? 8b4dfc }
            // n = 7, score = 100
            //   ff35????????         |                     
            //   c705????????00000000     |     
            //   c705????????01000000     |     
            //   c705????????00000000     |     
            //   c705????????03000000     |     
            //   ff15????????         |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_9 = { ffd0 894508 8b7de4 85ff 741a 8b75dc 8b1d???????? }
            // n = 7, score = 100
            //   ffd0                 | call                eax
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   8b7de4               | mov                 edi, dword ptr [ebp - 0x1c]
            //   85ff                 | test                edi, edi
            //   741a                 | je                  0x1c
            //   8b75dc               | mov                 esi, dword ptr [ebp - 0x24]
            //   8b1d????????         |                     

    condition:
        7 of them and filesize < 294912
}