rule win_cutwail_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 7e2d 8d7702 8d58ff 8a46ff }
            // n = 4, score = 200
            //   7e2d                 | jle                 0x2f
            //   8d7702               | lea                 esi, [edi + 2]
            //   8d58ff               | lea                 ebx, [eax - 1]
            //   8a46ff               | mov                 al, byte ptr [esi - 1]

        $sequence_1 = { 46 40 381e 75f6 a1???????? }
            // n = 5, score = 200
            //   46                   | inc                 esi
            //   40                   | inc                 eax
            //   381e                 | cmp                 byte ptr [esi], bl
            //   75f6                 | jne                 0xfffffff8
            //   a1????????           |                     

        $sequence_2 = { 8338ff 56 7554 83c004 }
            // n = 4, score = 200
            //   8338ff               | cmp                 dword ptr [eax], -1
            //   56                   | push                esi
            //   7554                 | jne                 0x56
            //   83c004               | add                 eax, 4

        $sequence_3 = { ff7514 ffd6 ff750c ff7514 ffd6 }
            // n = 5, score = 200
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   ffd6                 | call                esi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   ffd6                 | call                esi

        $sequence_4 = { e8???????? 03c3 6a73 8d4dee }
            // n = 4, score = 200
            //   e8????????           |                     
            //   03c3                 | add                 eax, ebx
            //   6a73                 | push                0x73
            //   8d4dee               | lea                 ecx, [ebp - 0x12]

        $sequence_5 = { 3bfb 7511 33d2 3bc3 }
            // n = 4, score = 200
            //   3bfb                 | cmp                 edi, ebx
            //   7511                 | jne                 0x13
            //   33d2                 | xor                 edx, edx
            //   3bc3                 | cmp                 eax, ebx

        $sequence_6 = { 894528 0f842a020000 68dc000000 8d4d88 }
            // n = 4, score = 200
            //   894528               | mov                 dword ptr [ebp + 0x28], eax
            //   0f842a020000         | je                  0x230
            //   68dc000000           | push                0xdc
            //   8d4d88               | lea                 ecx, [ebp - 0x78]

        $sequence_7 = { 33c0 eb11 53 ff15???????? 8b4514 }
            // n = 5, score = 200
            //   33c0                 | xor                 eax, eax
            //   eb11                 | jmp                 0x13
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]

    condition:
        7 of them and filesize < 262144
}