rule win_locky_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.locky."
        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.locky"
        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 = { 3bc7 5f 7210 c745f8???????? c745fc7a000000 }
            // n = 5, score = 2100
            //   3bc7                 | cmp                 eax, edi
            //   5f                   | pop                 edi
            //   7210                 | jb                  0x12
            //   c745f8????????       |                     
            //   c745fc7a000000       | mov                 dword ptr [ebp - 4], 0x7a

        $sequence_1 = { 0faf45a8 0fb7c8 0fb745aa 0faf459c 83c01f 83e0e0 }
            // n = 6, score = 2100
            //   0faf45a8             | imul                eax, dword ptr [ebp - 0x58]
            //   0fb7c8               | movzx               ecx, ax
            //   0fb745aa             | movzx               eax, word ptr [ebp - 0x56]
            //   0faf459c             | imul                eax, dword ptr [ebp - 0x64]
            //   83c01f               | add                 eax, 0x1f
            //   83e0e0               | and                 eax, 0xffffffe0

        $sequence_2 = { 53 a1???????? 56 8b7508 57 33ff 57 }
            // n = 7, score = 2100
            //   53                   | push                ebx
            //   a1????????           |                     
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   57                   | push                edi

        $sequence_3 = { 6a00 8d55fc 52 8d55f8 52 0d00000020 50 }
            // n = 7, score = 2100
            //   6a00                 | push                0
            //   8d55fc               | lea                 edx, [ebp - 4]
            //   52                   | push                edx
            //   8d55f8               | lea                 edx, [ebp - 8]
            //   52                   | push                edx
            //   0d00000020           | or                  eax, 0x20000000
            //   50                   | push                eax

        $sequence_4 = { 5a 894510 3bc2 895508 8d4508 7703 }
            // n = 6, score = 2100
            //   5a                   | pop                 edx
            //   894510               | mov                 dword ptr [ebp + 0x10], eax
            //   3bc2                 | cmp                 eax, edx
            //   895508               | mov                 dword ptr [ebp + 8], edx
            //   8d4508               | lea                 eax, [ebp + 8]
            //   7703                 | ja                  5

        $sequence_5 = { 8bec 81ec18040000 8365fc00 57 8d85e8fbffff 50 }
            // n = 6, score = 2100
            //   8bec                 | mov                 ebp, esp
            //   81ec18040000         | sub                 esp, 0x418
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   57                   | push                edi
            //   8d85e8fbffff         | lea                 eax, [ebp - 0x418]
            //   50                   | push                eax

        $sequence_6 = { 8d8d40ffffff 6a5c 51 c645fc06 e8???????? 8bc8 }
            // n = 6, score = 2100
            //   8d8d40ffffff         | lea                 ecx, [ebp - 0xc0]
            //   6a5c                 | push                0x5c
            //   51                   | push                ecx
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax

        $sequence_7 = { c9 c3 55 8bec 51 51 83781408 }
            // n = 7, score = 2100
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   83781408             | cmp                 dword ptr [eax + 0x14], 8

        $sequence_8 = { 03d3 5b c21000 e9???????? 8bff 55 8bec }
            // n = 7, score = 1400
            //   03d3                 | add                 edx, ebx
            //   5b                   | pop                 ebx
            //   c21000               | ret                 0x10
            //   e9????????           |                     
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_9 = { 66ab 90 e9???????? 8d00 }
            // n = 4, score = 700
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   90                   | nop                 
            //   e9????????           |                     
            //   8d00                 | lea                 eax, [eax]

        $sequence_10 = { 6a01 e9???????? 90 e8???????? 90 }
            // n = 5, score = 700
            //   6a01                 | push                1
            //   e9????????           |                     
            //   90                   | nop                 
            //   e8????????           |                     
            //   90                   | nop                 

        $sequence_11 = { 66ab e9???????? 90 8d36 }
            // n = 4, score = 700
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   e9????????           |                     
            //   90                   | nop                 
            //   8d36                 | lea                 esi, [esi]

        $sequence_12 = { 5e c21000 8bff 55 8bec 33c0 8b4d08 }
            // n = 7, score = 700
            //   5e                   | pop                 esi
            //   c21000               | ret                 0x10
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   33c0                 | xor                 eax, eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_13 = { 5f 90 e9???????? 90 }
            // n = 4, score = 700
            //   5f                   | pop                 edi
            //   90                   | nop                 
            //   e9????????           |                     
            //   90                   | nop                 

        $sequence_14 = { 6a67 90 e9???????? 58 }
            // n = 4, score = 700
            //   6a67                 | push                0x67
            //   90                   | nop                 
            //   e9????????           |                     
            //   58                   | pop                 eax

        $sequence_15 = { 66ab e9???????? 66ab 90 }
            // n = 4, score = 700
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   e9????????           |                     
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   90                   | nop                 

    condition:
        7 of them and filesize < 1122304
}