rule win_cutwail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.cutwail."
        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.cutwail"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 8b9554feffff 52 e8???????? 83c408 6a0c e8???????? 83c404 }
            // n = 7, score = 100
            //   8b9554feffff         | mov                 edx, dword ptr [ebp - 0x1ac]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   6a0c                 | push                0xc
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_1 = { 837dac14 732e 6a04 8d5e04 }
            // n = 4, score = 100
            //   837dac14             | cmp                 dword ptr [ebp - 0x54], 0x14
            //   732e                 | jae                 0x30
            //   6a04                 | push                4
            //   8d5e04               | lea                 ebx, dword ptr [esi + 4]

        $sequence_2 = { 53 57 e8???????? 8345f804 8bc6 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   57                   | push                edi
            //   e8????????           |                     
            //   8345f804             | add                 dword ptr [ebp - 8], 4
            //   8bc6                 | mov                 eax, esi

        $sequence_3 = { 8b06 8d4dec 51 8b4e04 }
            // n = 4, score = 100
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8d4dec               | lea                 ecx, dword ptr [ebp - 0x14]
            //   51                   | push                ecx
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]

        $sequence_4 = { 0560ea0000 39855cfeffff 7633 8b8d5cfeffff }
            // n = 4, score = 100
            //   0560ea0000           | add                 eax, 0xea60
            //   39855cfeffff         | cmp                 dword ptr [ebp - 0x1a4], eax
            //   7633                 | jbe                 0x35
            //   8b8d5cfeffff         | mov                 ecx, dword ptr [ebp - 0x1a4]

        $sequence_5 = { 83c404 898554feffff 83bd54feffff00 747b }
            // n = 4, score = 100
            //   83c404               | add                 esp, 4
            //   898554feffff         | mov                 dword ptr [ebp - 0x1ac], eax
            //   83bd54feffff00       | cmp                 dword ptr [ebp - 0x1ac], 0
            //   747b                 | je                  0x7d

        $sequence_6 = { 8b45f0 83c001 8945f0 8b4dfc 83790800 7416 8b55fc }
            // n = 7, score = 100
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   83c001               | add                 eax, 1
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   83790800             | cmp                 dword ptr [ecx + 8], 0
            //   7416                 | je                  0x18
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]

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

        $sequence_8 = { c68563feffff01 0fb69563feffff 83fa01 0f859d010000 8b856cfeffff 8b0c851cf62004 51 }
            // n = 7, score = 100
            //   c68563feffff01       | mov                 byte ptr [ebp - 0x19d], 1
            //   0fb69563feffff       | movzx               edx, byte ptr [ebp - 0x19d]
            //   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

        $sequence_9 = { 8906 8b4520 8938 e9???????? }
            // n = 4, score = 100
            //   8906                 | mov                 dword ptr [esi], eax
            //   8b4520               | mov                 eax, dword ptr [ebp + 0x20]
            //   8938                 | mov                 dword ptr [eax], edi
            //   e9????????           |                     

        $sequence_10 = { 03c8 83c418 83c706 3bf1 0f8252ffffff }
            // n = 5, score = 100
            //   03c8                 | add                 ecx, eax
            //   83c418               | add                 esp, 0x18
            //   83c706               | add                 edi, 6
            //   3bf1                 | cmp                 esi, ecx
            //   0f8252ffffff         | jb                  0xffffff58

        $sequence_11 = { 837d1000 7d04 32c0 eb57 c745fc00000000 837d1000 7437 }
            // n = 7, score = 100
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   7d04                 | jge                 6
            //   32c0                 | xor                 al, al
            //   eb57                 | jmp                 0x59
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   7437                 | je                  0x39

        $sequence_12 = { eb46 8b8568feffff 0560ea0000 39855cfeffff }
            // n = 4, score = 100
            //   eb46                 | jmp                 0x48
            //   8b8568feffff         | mov                 eax, dword ptr [ebp - 0x198]
            //   0560ea0000           | add                 eax, 0xea60
            //   39855cfeffff         | cmp                 dword ptr [ebp - 0x1a4], eax

        $sequence_13 = { e8???????? 83c410 ff45f0 8945fc }
            // n = 4, score = 100
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   ff45f0               | inc                 dword ptr [ebp - 0x10]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

        $sequence_14 = { 33c0 e9???????? 53 bba5000000 }
            // n = 4, score = 100
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   53                   | push                ebx
            //   bba5000000           | mov                 ebx, 0xa5

        $sequence_15 = { ff15???????? 8985d8fdffff 8b95e4fdffff 52 8d85f8fdffff 50 8b8decfdffff }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8985d8fdffff         | mov                 dword ptr [ebp - 0x228], eax
            //   8b95e4fdffff         | mov                 edx, dword ptr [ebp - 0x21c]
            //   52                   | push                edx
            //   8d85f8fdffff         | lea                 eax, dword ptr [ebp - 0x208]
            //   50                   | push                eax
            //   8b8decfdffff         | mov                 ecx, dword ptr [ebp - 0x214]

    condition:
        7 of them and filesize < 262144
}