rule win_sage_ransom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 7509 c60120 ba01000000 41 46 }
            // n = 5, score = 300
            //   7509                 | jne                 0xb
            //   c60120               | mov                 byte ptr [ecx], 0x20
            //   ba01000000           | mov                 edx, 1
            //   41                   | inc                 ecx
            //   46                   | inc                 esi

        $sequence_1 = { 8d442418 50 8d4c243c 51 e8???????? 8d542440 52 }
            // n = 7, score = 300
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   50                   | push                eax
            //   8d4c243c             | lea                 ecx, [esp + 0x3c]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8d542440             | lea                 edx, [esp + 0x40]
            //   52                   | push                edx

        $sequence_2 = { 837c241000 750b 837c241400 0f84d8000000 }
            // n = 4, score = 300
            //   837c241000           | cmp                 dword ptr [esp + 0x10], 0
            //   750b                 | jne                 0xd
            //   837c241400           | cmp                 dword ptr [esp + 0x14], 0
            //   0f84d8000000         | je                  0xde

        $sequence_3 = { 03ff 03ff 8b74240c 50 }
            // n = 4, score = 300
            //   03ff                 | add                 edi, edi
            //   03ff                 | add                 edi, edi
            //   8b74240c             | mov                 esi, dword ptr [esp + 0xc]
            //   50                   | push                eax

        $sequence_4 = { ff15???????? 85c0 7413 397c2408 750d }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7413                 | je                  0x15
            //   397c2408             | cmp                 dword ptr [esp + 8], edi
            //   750d                 | jne                 0xf

        $sequence_5 = { 03f9 8bf1 33d2 3bf7 }
            // n = 4, score = 300
            //   03f9                 | add                 edi, ecx
            //   8bf1                 | mov                 esi, ecx
            //   33d2                 | xor                 edx, edx
            //   3bf7                 | cmp                 esi, edi

        $sequence_6 = { 7564 8b4004 66833864 755b 6683780200 7554 6aff }
            // n = 7, score = 300
            //   7564                 | jne                 0x66
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   66833864             | cmp                 word ptr [eax], 0x64
            //   755b                 | jne                 0x5d
            //   6683780200           | cmp                 word ptr [eax + 2], 0
            //   7554                 | jne                 0x56
            //   6aff                 | push                -1

        $sequence_7 = { 6a00 57 8bf0 55 56 }
            // n = 5, score = 300
            //   6a00                 | push                0
            //   57                   | push                edi
            //   8bf0                 | mov                 esi, eax
            //   55                   | push                ebp
            //   56                   | push                esi

        $sequence_8 = { 53 8d7dc0 83ec5c 8b5d08 c744240404000000 }
            // n = 5, score = 200
            //   53                   | push                ebx
            //   8d7dc0               | lea                 edi, [ebp - 0x40]
            //   83ec5c               | sub                 esp, 0x5c
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   c744240404000000     | mov                 dword ptr [esp + 4], 4

        $sequence_9 = { 891c24 894c2408 e8???????? 85c0 7527 8b45e4 }
            // n = 6, score = 200
            //   891c24               | mov                 dword ptr [esp], ebx
            //   894c2408             | mov                 dword ptr [esp + 8], ecx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7527                 | jne                 0x29
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]

        $sequence_10 = { 50 31c0 8d65f4 5b 5e 5f 5d }
            // n = 7, score = 200
            //   50                   | push                eax
            //   31c0                 | xor                 eax, eax
            //   8d65f4               | lea                 esp, [ebp - 0xc]
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp

        $sequence_11 = { 83e701 0f45f2 c1e802 894dc0 8975b8 }
            // n = 5, score = 200
            //   83e701               | and                 edi, 1
            //   0f45f2               | cmovne              esi, edx
            //   c1e802               | shr                 eax, 2
            //   894dc0               | mov                 dword ptr [ebp - 0x40], ecx
            //   8975b8               | mov                 dword ptr [ebp - 0x48], esi

        $sequence_12 = { e8???????? 8d8de4fdffff 893c24 894c2404 e8???????? }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8d8de4fdffff         | lea                 ecx, [ebp - 0x21c]
            //   893c24               | mov                 dword ptr [esp], edi
            //   894c2404             | mov                 dword ptr [esp + 4], ecx
            //   e8????????           |                     

        $sequence_13 = { 8d8424f0040000 f3a5 89442408 8d842458040000 }
            // n = 4, score = 200
            //   8d8424f0040000       | lea                 eax, [esp + 0x4f0]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   8d842458040000       | lea                 eax, [esp + 0x458]

        $sequence_14 = { 85c0 0f8887010000 8b5dd4 8b03 01d8 8945b8 }
            // n = 6, score = 200
            //   85c0                 | test                eax, eax
            //   0f8887010000         | js                  0x18d
            //   8b5dd4               | mov                 ebx, dword ptr [ebp - 0x2c]
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   01d8                 | add                 eax, ebx
            //   8945b8               | mov                 dword ptr [ebp - 0x48], eax

        $sequence_15 = { 01c1 0fa4c301 8b442408 898c24a0000000 f76c2424 899c24a4000000 89c1 }
            // n = 7, score = 200
            //   01c1                 | add                 ecx, eax
            //   0fa4c301             | shld                ebx, eax, 1
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   898c24a0000000       | mov                 dword ptr [esp + 0xa0], ecx
            //   f76c2424             | imul                dword ptr [esp + 0x24]
            //   899c24a4000000       | mov                 dword ptr [esp + 0xa4], ebx
            //   89c1                 | mov                 ecx, eax

    condition:
        7 of them and filesize < 335872
}