rule win_synflooder_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.synflooder."
        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.synflooder"
        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 = { 51 ff15???????? 89470c c7471800000000 e8???????? 99 }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   89470c               | mov                 dword ptr [edi + 0xc], eax
            //   c7471800000000       | mov                 dword ptr [edi + 0x18], 0
            //   e8????????           |                     
            //   99                   | cdq                 

        $sequence_1 = { 7229 f3a5 ff2495e07a4000 8bc7 ba03000000 83e904 }
            // n = 6, score = 200
            //   7229                 | jb                  0x2b
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff2495e07a4000       | jmp                 dword ptr [edx*4 + 0x407ae0]
            //   8bc7                 | mov                 eax, edi
            //   ba03000000           | mov                 edx, 3
            //   83e904               | sub                 ecx, 4

        $sequence_2 = { 50 e8???????? 8b4de4 83c40c 6bc930 8975e0 8db130ea4000 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   83c40c               | add                 esp, 0xc
            //   6bc930               | imul                ecx, ecx, 0x30
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   8db130ea4000         | lea                 esi, [ecx + 0x40ea30]

        $sequence_3 = { ff15???????? 89470c c7471800000000 e8???????? 99 b9e8fd0000 f7f9 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   89470c               | mov                 dword ptr [edi + 0xc], eax
            //   c7471800000000       | mov                 dword ptr [edi + 0x18], 0
            //   e8????????           |                     
            //   99                   | cdq                 
            //   b9e8fd0000           | mov                 ecx, 0xfde8
            //   f7f9                 | idiv                ecx

        $sequence_4 = { a3???????? 8d7901 8a11 41 84d2 }
            // n = 5, score = 200
            //   a3????????           |                     
            //   8d7901               | lea                 edi, [ecx + 1]
            //   8a11                 | mov                 dl, byte ptr [ecx]
            //   41                   | inc                 ecx
            //   84d2                 | test                dl, dl

        $sequence_5 = { 8bff 56 57 33ff ffb7b0e54000 ff15???????? 8987b0e54000 }
            // n = 7, score = 200
            //   8bff                 | mov                 edi, edi
            //   56                   | push                esi
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   ffb7b0e54000         | push                dword ptr [edi + 0x40e5b0]
            //   ff15????????         |                     
            //   8987b0e54000         | mov                 dword ptr [edi + 0x40e5b0], eax

        $sequence_6 = { 83c404 eb17 bb00040000 c744241800280000 }
            // n = 4, score = 200
            //   83c404               | add                 esp, 4
            //   eb17                 | jmp                 0x19
            //   bb00040000           | mov                 ebx, 0x400
            //   c744241800280000     | mov                 dword ptr [esp + 0x18], 0x2800

        $sequence_7 = { e8???????? 85c0 0f8517010000 ff15???????? 50 e8???????? }
            // n = 6, score = 200
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8517010000         | jne                 0x11d
            //   ff15????????         |                     
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_8 = { 52 0fb6d4 52 0fb6c0 }
            // n = 4, score = 200
            //   52                   | push                edx
            //   0fb6d4               | movzx               edx, ah
            //   52                   | push                edx
            //   0fb6c0               | movzx               eax, al

        $sequence_9 = { 81ecf4010000 a1???????? 33c4 898424f0010000 53 56 }
            // n = 6, score = 200
            //   81ecf4010000         | sub                 esp, 0x1f4
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   898424f0010000       | mov                 dword ptr [esp + 0x1f0], eax
            //   53                   | push                ebx
            //   56                   | push                esi

    condition:
        7 of them and filesize < 163840
}

rule win_synflooder_w0 {
	meta:
		description = "Malware or hack tool used by attackers in Operation Cleaver"
		reference = "http://cylance.com/assets/Cleaver/Cylance_Operation_Cleaver_Report.pdf"
		date = "2014/12/02"
		author = "Cylance Inc."
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.synflooder"
        malpedia_version = "20170521"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
	strings:
		$s1 = "Unable to resolve [ %s ]. ErrorCode %d"
		$s2 = "your target’s IP is : %s"
		$s3 = "Raw TCP Socket Created successfully."
	condition:
		all of them
}