rule win_sage_ransom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.sage_ransom."
        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.sage_ransom"
        malpedia_rule_date = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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 = { e8???????? 8b54245c 52 8d442418 50 8d4c243c }
            // n = 6, score = 300
            //   e8????????           |                     
            //   8b54245c             | mov                 edx, dword ptr [esp + 0x5c]
            //   52                   | push                edx
            //   8d442418             | lea                 eax, dword ptr [esp + 0x18]
            //   50                   | push                eax
            //   8d4c243c             | lea                 ecx, dword ptr [esp + 0x3c]

        $sequence_1 = { 68c0270900 ffd6 6a02 e8???????? }
            // n = 4, score = 300
            //   68c0270900           | push                0x927c0
            //   ffd6                 | call                esi
            //   6a02                 | push                2
            //   e8????????           |                     

        $sequence_2 = { 83c414 8d4c2404 51 8d542418 }
            // n = 4, score = 300
            //   83c414               | add                 esp, 0x14
            //   8d4c2404             | lea                 ecx, dword ptr [esp + 4]
            //   51                   | push                ecx
            //   8d542418             | lea                 edx, dword ptr [esp + 0x18]

        $sequence_3 = { 57 ff15???????? 5f 5e 6a00 }
            // n = 5, score = 300
            //   57                   | push                edi
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   6a00                 | push                0

        $sequence_4 = { 56 57 68d1070000 6a08 e8???????? 8b3d???????? 83c408 }
            // n = 7, score = 300
            //   56                   | push                esi
            //   57                   | push                edi
            //   68d1070000           | push                0x7d1
            //   6a08                 | push                8
            //   e8????????           |                     
            //   8b3d????????         |                     
            //   83c408               | add                 esp, 8

        $sequence_5 = { e8???????? 85c0 754d 85ed 7410 }
            // n = 5, score = 300
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   754d                 | jne                 0x4f
            //   85ed                 | test                ebp, ebp
            //   7410                 | je                  0x12

        $sequence_6 = { 83ec40 56 8b742448 8d442404 6a00 }
            // n = 5, score = 300
            //   83ec40               | sub                 esp, 0x40
            //   56                   | push                esi
            //   8b742448             | mov                 esi, dword ptr [esp + 0x48]
            //   8d442404             | lea                 eax, dword ptr [esp + 4]
            //   6a00                 | push                0

        $sequence_7 = { e8???????? 85c0 7422 50 6a00 6800041000 }
            // n = 6, score = 300
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7422                 | je                  0x24
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6800041000           | push                0x100400

        $sequence_8 = { 014114 8b4318 014118 8b431c }
            // n = 4, score = 200
            //   014114               | add                 dword ptr [ecx + 0x14], eax
            //   8b4318               | mov                 eax, dword ptr [ebx + 0x18]
            //   014118               | add                 dword ptr [ecx + 0x18], eax
            //   8b431c               | mov                 eax, dword ptr [ebx + 0x1c]

        $sequence_9 = { 014110 8b4314 014114 8b4318 }
            // n = 4, score = 200
            //   014110               | add                 dword ptr [ecx + 0x10], eax
            //   8b4314               | mov                 eax, dword ptr [ebx + 0x14]
            //   014114               | add                 dword ptr [ecx + 0x14], eax
            //   8b4318               | mov                 eax, dword ptr [ebx + 0x18]

        $sequence_10 = { 014108 8b430c 01410c 8b4310 }
            // n = 4, score = 200
            //   014108               | add                 dword ptr [ecx + 8], eax
            //   8b430c               | mov                 eax, dword ptr [ebx + 0xc]
            //   01410c               | add                 dword ptr [ecx + 0xc], eax
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]

        $sequence_11 = { 0119 117104 83c110 83c210 }
            // n = 4, score = 200
            //   0119                 | add                 dword ptr [ecx], ebx
            //   117104               | adc                 dword ptr [ecx + 4], esi
            //   83c110               | add                 ecx, 0x10
            //   83c210               | add                 edx, 0x10

        $sequence_12 = { 01410c 8b4310 014110 8b4314 }
            // n = 4, score = 200
            //   01410c               | add                 dword ptr [ecx + 0xc], eax
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]
            //   014110               | add                 dword ptr [ecx + 0x10], eax
            //   8b4314               | mov                 eax, dword ptr [ebx + 0x14]

        $sequence_13 = { 891424 ff90dc010000 50 8b8d38ffffff 89742404 }
            // n = 5, score = 200
            //   891424               | mov                 dword ptr [esp], edx
            //   ff90dc010000         | call                dword ptr [eax + 0x1dc]
            //   50                   | push                eax
            //   8b8d38ffffff         | mov                 ecx, dword ptr [ebp - 0xc8]
            //   89742404             | mov                 dword ptr [esp + 4], esi

        $sequence_14 = { 0101 8b4304 014104 8b4308 014108 }
            // n = 5, score = 200
            //   0101                 | add                 dword ptr [ecx], eax
            //   8b4304               | mov                 eax, dword ptr [ebx + 4]
            //   014104               | add                 dword ptr [ecx + 4], eax
            //   8b4308               | mov                 eax, dword ptr [ebx + 8]
            //   014108               | add                 dword ptr [ecx + 8], eax

        $sequence_15 = { 013c13 83c102 46 ebd3 }
            // n = 4, score = 200
            //   013c13               | add                 dword ptr [ebx + edx], edi
            //   83c102               | add                 ecx, 2
            //   46                   | inc                 esi
            //   ebd3                 | jmp                 0xffffffd5

    condition:
        7 of them and filesize < 335872
}