rule win_sage_ransom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { 8bc3 5b 83c408 c3 57 }
            // n = 5, score = 300
            //   8bc3                 | mov                 eax, ebx
            //   5b                   | pop                 ebx
            //   83c408               | add                 esp, 8
            //   c3                   | ret                 
            //   57                   | push                edi

        $sequence_1 = { 7fc9 8b442428 50 e8???????? 83c404 bbfdffffff 8d4c240c }
            // n = 7, score = 300
            //   7fc9                 | jg                  0xffffffcb
            //   8b442428             | mov                 eax, dword ptr [esp + 0x28]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   bbfdffffff           | mov                 ebx, 0xfffffffd
            //   8d4c240c             | lea                 ecx, [esp + 0xc]

        $sequence_2 = { 85c0 7440 56 57 6af5 }
            // n = 5, score = 300
            //   85c0                 | test                eax, eax
            //   7440                 | je                  0x42
            //   56                   | push                esi
            //   57                   | push                edi
            //   6af5                 | push                -0xb

        $sequence_3 = { 56 57 ff15???????? 5f 5e 6a00 }
            // n = 6, score = 300
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   6a00                 | push                0

        $sequence_4 = { 57 8bd8 ff15???????? 8b4c2420 6a01 }
            // n = 5, score = 300
            //   57                   | push                edi
            //   8bd8                 | mov                 ebx, eax
            //   ff15????????         |                     
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]
            //   6a01                 | push                1

        $sequence_5 = { f3a5 247f 8d4c2408 51 8844242b 8b442430 }
            // n = 6, score = 300
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   247f                 | and                 al, 0x7f
            //   8d4c2408             | lea                 ecx, [esp + 8]
            //   51                   | push                ecx
            //   8844242b             | mov                 byte ptr [esp + 0x2b], al
            //   8b442430             | mov                 eax, dword ptr [esp + 0x30]

        $sequence_6 = { 83ec08 68b90b0000 6a08 e8???????? }
            // n = 4, score = 300
            //   83ec08               | sub                 esp, 8
            //   68b90b0000           | push                0xbb9
            //   6a08                 | push                8
            //   e8????????           |                     

        $sequence_7 = { 83ec0c 8d0424 56 50 e8???????? 8d4c2408 }
            // n = 6, score = 300
            //   83ec0c               | sub                 esp, 0xc
            //   8d0424               | lea                 eax, [esp]
            //   56                   | push                esi
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d4c2408             | lea                 ecx, [esp + 8]

        $sequence_8 = { 891c24 89442404 e8???????? 8d96bb1e0000 }
            // n = 4, score = 200
            //   891c24               | mov                 dword ptr [esp], ebx
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   e8????????           |                     
            //   8d96bb1e0000         | lea                 edx, [esi + 0x1ebb]

        $sequence_9 = { 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_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 = { 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_12 = { 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_13 = { 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_14 = { 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_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
}