rule win_cutwail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 56 c6455d00 ff15???????? 85c0 89452c }
            // n = 5, score = 100
            //   56                   | push                esi
            //   c6455d00             | mov                 byte ptr [ebp + 0x5d], 0
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   89452c               | mov                 dword ptr [ebp + 0x2c], eax

        $sequence_1 = { 0fb74e0a 6bc03c 03c1 0fb74e0c }
            // n = 4, score = 100
            //   0fb74e0a             | movzx               ecx, word ptr [esi + 0xa]
            //   6bc03c               | imul                eax, eax, 0x3c
            //   03c1                 | add                 eax, ecx
            //   0fb74e0c             | movzx               ecx, word ptr [esi + 0xc]

        $sequence_2 = { 6a01 e8???????? 8d8d44f8ffff 83c414 57 }
            // n = 5, score = 100
            //   6a01                 | push                1
            //   e8????????           |                     
            //   8d8d44f8ffff         | lea                 ecx, [ebp - 0x7bc]
            //   83c414               | add                 esp, 0x14
            //   57                   | push                edi

        $sequence_3 = { 57 6a1c e8???????? 8b0d???????? }
            // n = 4, score = 100
            //   57                   | push                edi
            //   6a1c                 | push                0x1c
            //   e8????????           |                     
            //   8b0d????????         |                     

        $sequence_4 = { 8b85e8fdffff 8b0c8500f62004 51 e8???????? 83c410 }
            // n = 5, score = 100
            //   8b85e8fdffff         | mov                 eax, dword ptr [ebp - 0x218]
            //   8b0c8500f62004       | mov                 ecx, dword ptr [eax*4 + 0x420f600]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10

        $sequence_5 = { 8b8d44feffff 8b9548feffff 895104 8b8544feffff c7400800c02004 6a00 6a00 }
            // n = 7, score = 100
            //   8b8d44feffff         | mov                 ecx, dword ptr [ebp - 0x1bc]
            //   8b9548feffff         | mov                 edx, dword ptr [ebp - 0x1b8]
            //   895104               | mov                 dword ptr [ecx + 4], edx
            //   8b8544feffff         | mov                 eax, dword ptr [ebp - 0x1bc]
            //   c7400800c02004       | mov                 dword ptr [eax + 8], 0x420c000
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_6 = { 753f 8d45fc 50 8d45e4 }
            // n = 4, score = 100
            //   753f                 | jne                 0x41
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   8d45e4               | lea                 eax, [ebp - 0x1c]

        $sequence_7 = { 8b01 3938 57 57 }
            // n = 4, score = 100
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   3938                 | cmp                 dword ptr [eax], edi
            //   57                   | push                edi
            //   57                   | push                edi

        $sequence_8 = { 7e0b ff15???????? 8b4d18 8901 837df800 }
            // n = 5, score = 100
            //   7e0b                 | jle                 0xd
            //   ff15????????         |                     
            //   8b4d18               | mov                 ecx, dword ptr [ebp + 0x18]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   837df800             | cmp                 dword ptr [ebp - 8], 0

        $sequence_9 = { c785e0fdffff00000000 c785dcfdffff00000000 8d95dcfdffff 52 }
            // n = 4, score = 100
            //   c785e0fdffff00000000     | mov    dword ptr [ebp - 0x220], 0
            //   c785dcfdffff00000000     | mov    dword ptr [ebp - 0x224], 0
            //   8d95dcfdffff         | lea                 edx, [ebp - 0x224]
            //   52                   | push                edx

        $sequence_10 = { 83c404 8985e4fdffff 6a07 e8???????? 83c404 8985e8fdffff }
            // n = 6, 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

        $sequence_11 = { 8b4d10 2b4df8 894d10 ebc3 6a00 }
            // n = 5, score = 100
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   2b4df8               | sub                 ecx, dword ptr [ebp - 8]
            //   894d10               | mov                 dword ptr [ebp + 0x10], ecx
            //   ebc3                 | jmp                 0xffffffc5
            //   6a00                 | push                0

        $sequence_12 = { 3bcb 74f4 8b01 3bc3 74ee }
            // n = 5, score = 100
            //   3bcb                 | cmp                 ecx, ebx
            //   74f4                 | je                  0xfffffff6
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   3bc3                 | cmp                 eax, ebx
            //   74ee                 | je                  0xfffffff0

        $sequence_13 = { 56 57 0f86ad000000 6874030000 }
            // n = 4, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   0f86ad000000         | jbe                 0xb3
            //   6874030000           | push                0x374

        $sequence_14 = { 8b856cfeffff 8b0c851cf62004 51 e8???????? 83c404 898554feffff }
            // n = 6, score = 100
            //   8b856cfeffff         | mov                 eax, dword ptr [ebp - 0x194]
            //   8b0c851cf62004       | mov                 ecx, dword ptr [eax*4 + 0x420f61c]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   898554feffff         | mov                 dword ptr [ebp - 0x1ac], eax

        $sequence_15 = { c7400800c02004 6a00 6a00 8b8d44feffff 51 68???????? 6a00 }
            // n = 7, score = 100
            //   c7400800c02004       | mov                 dword ptr [eax + 8], 0x420c000
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8b8d44feffff         | mov                 ecx, dword ptr [ebp - 0x1bc]
            //   51                   | push                ecx
            //   68????????           |                     
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 262144
}