rule win_cutwail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 6a01 6a19 8b85e8fdffff 8b0c8500f62004 51 e8???????? }
            // n = 6, score = 100
            //   6a01                 | push                1
            //   6a19                 | push                0x19
            //   8b85e8fdffff         | mov                 eax, dword ptr [ebp - 0x218]
            //   8b0c8500f62004       | mov                 ecx, dword ptr [eax*4 + 0x420f600]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_1 = { 7d04 32c0 eb7d c745fc00000000 837d1000 }
            // n = 5, score = 100
            //   7d04                 | jge                 6
            //   32c0                 | xor                 al, al
            //   eb7d                 | jmp                 0x7f
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0

        $sequence_2 = { 5e 5b c20800 837c24140c 752f }
            // n = 5, score = 100
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c20800               | ret                 8
            //   837c24140c           | cmp                 dword ptr [esp + 0x14], 0xc
            //   752f                 | jne                 0x31

        $sequence_3 = { 6a38 8d4dae 8d7c031c e8???????? 83c004 }
            // n = 5, score = 100
            //   6a38                 | push                0x38
            //   8d4dae               | lea                 ecx, [ebp - 0x52]
            //   8d7c031c             | lea                 edi, [ebx + eax + 0x1c]
            //   e8????????           |                     
            //   83c004               | add                 eax, 4

        $sequence_4 = { 894500 8bc2 c1e808 23c6 }
            // n = 4, score = 100
            //   894500               | mov                 dword ptr [ebp], eax
            //   8bc2                 | mov                 eax, edx
            //   c1e808               | shr                 eax, 8
            //   23c6                 | and                 eax, esi

        $sequence_5 = { 52 e8???????? 83c408 6a0c e8???????? 83c404 }
            // n = 6, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   6a0c                 | push                0xc
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_6 = { 837d0800 745e 837d0c00 7458 c745f800000000 eb09 }
            // n = 6, score = 100
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   745e                 | je                  0x60
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7458                 | je                  0x5a
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   eb09                 | jmp                 0xb

        $sequence_7 = { 81ec28020000 c745fc00000000 c745f803000000 c785f4fdffff00000000 eb0f 8b85f4fdffff 83c001 }
            // n = 7, score = 100
            //   81ec28020000         | sub                 esp, 0x228
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   c745f803000000       | mov                 dword ptr [ebp - 8], 3
            //   c785f4fdffff00000000     | mov    dword ptr [ebp - 0x20c], 0
            //   eb0f                 | jmp                 0x11
            //   8b85f4fdffff         | mov                 eax, dword ptr [ebp - 0x20c]
            //   83c001               | add                 eax, 1

        $sequence_8 = { 83c41c 3bfb 751d 68ca000000 }
            // n = 4, score = 100
            //   83c41c               | add                 esp, 0x1c
            //   3bfb                 | cmp                 edi, ebx
            //   751d                 | jne                 0x1f
            //   68ca000000           | push                0xca

        $sequence_9 = { 8b5508 52 e8???????? 8945f8 837d1800 }
            // n = 5, score = 100
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   837d1800             | cmp                 dword ptr [ebp + 0x18], 0

        $sequence_10 = { 8b08 83c41c ff75e0 6848ec6814 }
            // n = 4, score = 100
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   83c41c               | add                 esp, 0x1c
            //   ff75e0               | push                dword ptr [ebp - 0x20]
            //   6848ec6814           | push                0x1468ec48

        $sequence_11 = { 33f6 897524 897538 c6455d00 e9???????? }
            // n = 5, score = 100
            //   33f6                 | xor                 esi, esi
            //   897524               | mov                 dword ptr [ebp + 0x24], esi
            //   897538               | mov                 dword ptr [ebp + 0x38], esi
            //   c6455d00             | mov                 byte ptr [ebp + 0x5d], 0
            //   e9????????           |                     

        $sequence_12 = { 8945fc 8b4dfc 833900 0f84ba000000 c745f000000000 817df096000000 0f87a6000000 }
            // n = 7, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   833900               | cmp                 dword ptr [ecx], 0
            //   0f84ba000000         | je                  0xc0
            //   c745f000000000       | mov                 dword ptr [ebp - 0x10], 0
            //   817df096000000       | cmp                 dword ptr [ebp - 0x10], 0x96
            //   0f87a6000000         | ja                  0xac

        $sequence_13 = { c3 57 8b7810 53 }
            // n = 4, score = 100
            //   c3                   | ret                 
            //   57                   | push                edi
            //   8b7810               | mov                 edi, dword ptr [eax + 0x10]
            //   53                   | push                ebx

        $sequence_14 = { 8b4df8 3b4d0c 7d2e 8d55f0 52 }
            // n = 5, score = 100
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   3b4d0c               | cmp                 ecx, dword ptr [ebp + 0xc]
            //   7d2e                 | jge                 0x30
            //   8d55f0               | lea                 edx, [ebp - 0x10]
            //   52                   | push                edx

        $sequence_15 = { c3 50 ffd6 ff35???????? }
            // n = 4, score = 100
            //   c3                   | ret                 
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   ff35????????         |                     

    condition:
        7 of them and filesize < 262144
}