rule win_cutwail_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.cutwail"
        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 = { 85c0 7403 c60000 53 6800040000 bb???????? }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   c60000               | mov                 byte ptr [eax], 0
            //   53                   | push                ebx
            //   6800040000           | push                0x400
            //   bb????????           |                     

        $sequence_1 = { ff30 e8???????? e8???????? 8b06 ff30 }
            // n = 5, score = 100
            //   ff30                 | push                dword ptr [eax]
            //   e8????????           |                     
            //   e8????????           |                     
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   ff30                 | push                dword ptr [eax]

        $sequence_2 = { 83bdf0fdffff46 0f8d23010000 6800020000 6a00 }
            // n = 4, score = 100
            //   83bdf0fdffff46       | cmp                 dword ptr [ebp - 0x210], 0x46
            //   0f8d23010000         | jge                 0x129
            //   6800020000           | push                0x200
            //   6a00                 | push                0

        $sequence_3 = { 8b7d10 3bfb 746b 8b4508 33c9 6a04 }
            // n = 6, score = 100
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]
            //   3bfb                 | cmp                 edi, ebx
            //   746b                 | je                  0x6d
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   33c9                 | xor                 ecx, ecx
            //   6a04                 | push                4

        $sequence_4 = { f775f4 8955d8 e8???????? 33d2 f775e4 8955dc }
            // n = 6, score = 100
            //   f775f4               | div                 dword ptr [ebp - 0xc]
            //   8955d8               | mov                 dword ptr [ebp - 0x28], edx
            //   e8????????           |                     
            //   33d2                 | xor                 edx, edx
            //   f775e4               | div                 dword ptr [ebp - 0x1c]
            //   8955dc               | mov                 dword ptr [ebp - 0x24], edx

        $sequence_5 = { 0f84b3030000 48 0f846af9ffff 48 0f84c5faffff }
            // n = 5, score = 100
            //   0f84b3030000         | je                  0x3b9
            //   48                   | dec                 eax
            //   0f846af9ffff         | je                  0xfffff970
            //   48                   | dec                 eax
            //   0f84c5faffff         | je                  0xfffffacb

        $sequence_6 = { 2b45f8 894510 eb9a 837d1400 7408 8b4d14 }
            // n = 6, score = 100
            //   2b45f8               | sub                 eax, dword ptr [ebp - 8]
            //   894510               | mov                 dword ptr [ebp + 0x10], eax
            //   eb9a                 | jmp                 0xffffff9c
            //   837d1400             | cmp                 dword ptr [ebp + 0x14], 0
            //   7408                 | je                  0xa
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]

        $sequence_7 = { 56 57 8b7c240c 8b07 8b4804 33f6 2bce }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7c240c             | mov                 edi, dword ptr [esp + 0xc]
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   33f6                 | xor                 esi, esi
            //   2bce                 | sub                 ecx, esi

        $sequence_8 = { 8b442410 85c0 740f 894629 894e10 c7461801000000 eb07 }
            // n = 7, score = 100
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   85c0                 | test                eax, eax
            //   740f                 | je                  0x11
            //   894629               | mov                 dword ptr [esi + 0x29], eax
            //   894e10               | mov                 dword ptr [esi + 0x10], ecx
            //   c7461801000000       | mov                 dword ptr [esi + 0x18], 1
            //   eb07                 | jmp                 9

        $sequence_9 = { eb0d 6a01 ff15???????? e9???????? }
            // n = 4, score = 100
            //   eb0d                 | jmp                 0xf
            //   6a01                 | push                1
            //   ff15????????         |                     
            //   e9????????           |                     

        $sequence_10 = { ff15???????? 8b4dfc c7410400000000 6830750000 ff15???????? }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   c7410400000000       | mov                 dword ptr [ecx + 4], 0
            //   6830750000           | push                0x7530
            //   ff15????????         |                     

        $sequence_11 = { 8b8d64feffff 038d4cfeffff 8b9544feffff 8b048d30f62004 }
            // n = 4, score = 100
            //   8b8d64feffff         | mov                 ecx, dword ptr [ebp - 0x19c]
            //   038d4cfeffff         | add                 ecx, dword ptr [ebp - 0x1b4]
            //   8b9544feffff         | mov                 edx, dword ptr [ebp - 0x1bc]
            //   8b048d30f62004       | mov                 eax, dword ptr [ecx*4 + 0x420f630]

        $sequence_12 = { 7905 48 83c8fe 40 752a }
            // n = 5, score = 100
            //   7905                 | jns                 7
            //   48                   | dec                 eax
            //   83c8fe               | or                  eax, 0xfffffffe
            //   40                   | inc                 eax
            //   752a                 | jne                 0x2c

        $sequence_13 = { 83fa01 0f859d010000 8b856cfeffff 8b0c851cf62004 51 e8???????? }
            // n = 6, score = 100
            //   83fa01               | cmp                 edx, 1
            //   0f859d010000         | jne                 0x1a3
            //   8b856cfeffff         | mov                 eax, dword ptr [ebp - 0x194]
            //   8b0c851cf62004       | mov                 ecx, dword ptr [eax*4 + 0x420f61c]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_14 = { 8a8a7c310004 8808 ebc1 8b5508 03550c c60200 c745fc01000000 }
            // n = 7, score = 100
            //   8a8a7c310004         | mov                 cl, byte ptr [edx + 0x400317c]
            //   8808                 | mov                 byte ptr [eax], cl
            //   ebc1                 | jmp                 0xffffffc3
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   03550c               | add                 edx, dword ptr [ebp + 0xc]
            //   c60200               | mov                 byte ptr [edx], 0
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1

        $sequence_15 = { 817df096000000 0f87a6000000 c745ec00000000 8d55ec }
            // n = 4, score = 100
            //   817df096000000       | cmp                 dword ptr [ebp - 0x10], 0x96
            //   0f87a6000000         | ja                  0xac
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0
            //   8d55ec               | lea                 edx, [ebp - 0x14]

    condition:
        7 of them and filesize < 262144
}