rule win_cutwail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cutwail"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 83f80c 0f8427010000 837f1400 0f851d010000 83f806 }
            // n = 5, score = 100
            //   83f80c               | cmp                 eax, 0xc
            //   0f8427010000         | je                  0x12d
            //   837f1400             | cmp                 dword ptr [edi + 0x14], 0
            //   0f851d010000         | jne                 0x123
            //   83f806               | cmp                 eax, 6

        $sequence_1 = { 57 50 ff75fc e8???????? 85c0 753b }
            // n = 6, score = 100
            //   57                   | push                edi
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   753b                 | jne                 0x3d

        $sequence_2 = { 8b4608 3bc3 c6466001 7444 8338ff }
            // n = 5, score = 100
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   3bc3                 | cmp                 eax, ebx
            //   c6466001             | mov                 byte ptr [esi + 0x60], 1
            //   7444                 | je                  0x46
            //   8338ff               | cmp                 dword ptr [eax], -1

        $sequence_3 = { 7513 6a6b 8d8d30faffff e8???????? 83c004 8945e8 }
            // n = 6, score = 100
            //   7513                 | jne                 0x15
            //   6a6b                 | push                0x6b
            //   8d8d30faffff         | lea                 ecx, [ebp - 0x5d0]
            //   e8????????           |                     
            //   83c004               | add                 eax, 4
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax

        $sequence_4 = { 897c0804 8b4604 8b0e 6bc00c ff750c }
            // n = 5, score = 100
            //   897c0804             | mov                 dword ptr [eax + ecx + 4], edi
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   6bc00c               | imul                eax, eax, 0xc
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_5 = { 57 57 57 ff757c e8???????? }
            // n = 5, score = 100
            //   57                   | push                edi
            //   57                   | push                edi
            //   57                   | push                edi
            //   ff757c               | push                dword ptr [ebp + 0x7c]
            //   e8????????           |                     

        $sequence_6 = { 33db 395d0c 56 8bf1 7508 83c8ff e9???????? }
            // n = 7, score = 100
            //   33db                 | xor                 ebx, ebx
            //   395d0c               | cmp                 dword ptr [ebp + 0xc], ebx
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   7508                 | jne                 0xa
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     

        $sequence_7 = { 83c004 ff35???????? 50 e8???????? a1???????? }
            // n = 5, score = 100
            //   83c004               | add                 eax, 4
            //   ff35????????         |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   a1????????           |                     

    condition:
        7 of them and filesize < 262144
}