rule win_cutwail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 8b3c38 89540f04 8b556c 8b1410 }
            // n = 4, score = 100
            //   8b3c38               | mov                 edi, dword ptr [eax + edi]
            //   89540f04             | mov                 dword ptr [edi + ecx + 4], edx
            //   8b556c               | mov                 edx, dword ptr [ebp + 0x6c]
            //   8b1410               | mov                 edx, dword ptr [eax + edx]

        $sequence_1 = { 53 53 8d8554feffff 50 688e000000 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d8554feffff         | lea                 eax, [ebp - 0x1ac]
            //   50                   | push                eax
            //   688e000000           | push                0x8e

        $sequence_2 = { c78564feffff00000000 ff15???????? 898568feffff c68563feffff00 83bd6cfeffff00 }
            // n = 5, score = 100
            //   c78564feffff00000000     | mov    dword ptr [ebp - 0x19c], 0
            //   ff15????????         |                     
            //   898568feffff         | mov                 dword ptr [ebp - 0x198], eax
            //   c68563feffff00       | mov                 byte ptr [ebp - 0x19d], 0
            //   83bd6cfeffff00       | cmp                 dword ptr [ebp - 0x194], 0

        $sequence_3 = { 50 897d48 897d14 c6455b00 }
            // n = 4, score = 100
            //   50                   | push                eax
            //   897d48               | mov                 dword ptr [ebp + 0x48], edi
            //   897d14               | mov                 dword ptr [ebp + 0x14], edi
            //   c6455b00             | mov                 byte ptr [ebp + 0x5b], 0

        $sequence_4 = { ff15???????? e9???????? 8b956cfeffff 83c201 89956cfeffff }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   e9????????           |                     
            //   8b956cfeffff         | mov                 edx, dword ptr [ebp - 0x194]
            //   83c201               | add                 edx, 1
            //   89956cfeffff         | mov                 dword ptr [ebp - 0x194], edx

        $sequence_5 = { 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_6 = { 894d10 ebc3 6a00 6a00 8b550c 52 }
            // n = 6, score = 100
            //   894d10               | mov                 dword ptr [ebp + 0x10], ecx
            //   ebc3                 | jmp                 0xffffffc5
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   52                   | push                edx

        $sequence_7 = { e8???????? 8b0f 83c410 395d0c }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   83c410               | add                 esp, 0x10
            //   395d0c               | cmp                 dword ptr [ebp + 0xc], ebx

        $sequence_8 = { 7419 8b4518 833800 7511 837df800 7e0b }
            // n = 6, score = 100
            //   7419                 | je                  0x1b
            //   8b4518               | mov                 eax, dword ptr [ebp + 0x18]
            //   833800               | cmp                 dword ptr [eax], 0
            //   7511                 | jne                 0x13
            //   837df800             | cmp                 dword ptr [ebp - 8], 0
            //   7e0b                 | jle                 0xd

        $sequence_9 = { 8b8d5cfeffff 3b8d68feffff 730e 8b955cfeffff 899568feffff eb46 }
            // n = 6, score = 100
            //   8b8d5cfeffff         | mov                 ecx, dword ptr [ebp - 0x1a4]
            //   3b8d68feffff         | cmp                 ecx, dword ptr [ebp - 0x198]
            //   730e                 | jae                 0x10
            //   8b955cfeffff         | mov                 edx, dword ptr [ebp - 0x1a4]
            //   899568feffff         | mov                 dword ptr [ebp - 0x198], edx
            //   eb46                 | jmp                 0x48

        $sequence_10 = { 83c404 8985e4fdffff 6a07 e8???????? 83c404 8985e8fdffff 6888130000 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   8985e4fdffff         | mov                 dword ptr [ebp - 0x21c], eax
            //   6a07                 | push                7
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8985e8fdffff         | mov                 dword ptr [ebp - 0x218], eax
            //   6888130000           | push                0x1388

        $sequence_11 = { eb77 83bd6cfeffff05 7d6e ff15???????? 89855cfeffff 8b8d5cfeffff 3b8d68feffff }
            // n = 7, score = 100
            //   eb77                 | jmp                 0x79
            //   83bd6cfeffff05       | cmp                 dword ptr [ebp - 0x194], 5
            //   7d6e                 | jge                 0x70
            //   ff15????????         |                     
            //   89855cfeffff         | mov                 dword ptr [ebp - 0x1a4], eax
            //   8b8d5cfeffff         | mov                 ecx, dword ptr [ebp - 0x1a4]
            //   3b8d68feffff         | cmp                 ecx, dword ptr [ebp - 0x198]

        $sequence_12 = { 51 e8???????? 8b4550 8b4d74 }
            // n = 4, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b4550               | mov                 eax, dword ptr [ebp + 0x50]
            //   8b4d74               | mov                 ecx, dword ptr [ebp + 0x74]

        $sequence_13 = { 8bf8 83c410 3bfb 7422 }
            // n = 4, score = 100
            //   8bf8                 | mov                 edi, eax
            //   83c410               | add                 esp, 0x10
            //   3bfb                 | cmp                 edi, ebx
            //   7422                 | je                  0x24

        $sequence_14 = { 33c0 ebf7 8b442404 8b4808 }
            // n = 4, score = 100
            //   33c0                 | xor                 eax, eax
            //   ebf7                 | jmp                 0xfffffff9
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   8b4808               | mov                 ecx, dword ptr [eax + 8]

        $sequence_15 = { 7459 8b06 3bc7 7453 }
            // n = 4, score = 100
            //   7459                 | je                  0x5b
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   3bc7                 | cmp                 eax, edi
            //   7453                 | je                  0x55

    condition:
        7 of them and filesize < 262144
}