SYMBOLCOMMON_NAMEaka. SYNONYMS
win.synflooder (Back to overview)

SynFlooder

Actor(s): Cleaver


There is no description at this point.

References
2016-04-06CylanceCylance
@techreport{cylance:20160406:operation:d4da7b5, author = {Cylance}, title = {{Operation Cleaver}}, date = {2016-04-06}, institution = {Cylance}, url = {https://www.cylance.com/content/dam/cylance/pages/operation-cleaver/Cylance_Operation_Cleaver_Report.pdf}, language = {English}, urldate = {2020-01-10} } Operation Cleaver
CsExt Jasus KAgent NetC PvzOut SynFlooder TinyZbot WndTest ZhCat ZhMimikatz Cleaver
Yara Rules
[TLP:WHITE] win_synflooder_auto (20220516 | Detects win.synflooder.)
rule win_synflooder_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "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 = { 56 57 6a14 e8???????? 8bf0 a1???????? 33c9 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a14                 | push                0x14
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   a1????????           |                     
            //   33c9                 | xor                 ecx, ecx

        $sequence_1 = { 59 85c0 7409 c700dddd0000 83c008 8bd8 eb02 }
            // n = 7, score = 200
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7409                 | je                  0xb
            //   c700dddd0000         | mov                 dword ptr [eax], 0xdddd
            //   83c008               | add                 eax, 8
            //   8bd8                 | mov                 ebx, eax
            //   eb02                 | jmp                 4

        $sequence_2 = { e8???????? 8b5718 83c404 52 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   8b5718               | mov                 edx, dword ptr [edi + 0x18]
            //   83c404               | add                 esp, 4
            //   52                   | push                edx

        $sequence_3 = { 57 33ff ffb7b0e54000 ff15???????? 8987b0e54000 83c704 }
            // n = 6, score = 200
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   ffb7b0e54000         | push                dword ptr [edi + 0x40e5b0]
            //   ff15????????         |                     
            //   8987b0e54000         | mov                 dword ptr [edi + 0x40e5b0], eax
            //   83c704               | add                 edi, 4

        $sequence_4 = { f7f9 8b4508 52 0fb6d4 52 0fb6c0 }
            // n = 6, score = 200
            //   f7f9                 | idiv                ecx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   52                   | push                edx
            //   0fb6d4               | movzx               edx, ah
            //   52                   | push                edx
            //   0fb6c0               | movzx               eax, al

        $sequence_5 = { 8b5718 83c404 52 8bf0 e8???????? 83c404 eb17 }
            // n = 7, score = 200
            //   8b5718               | mov                 edx, dword ptr [edi + 0x18]
            //   83c404               | add                 esp, 4
            //   52                   | push                edx
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   eb17                 | jmp                 0x19

        $sequence_6 = { 33f6 bf???????? 833cf584e4400001 751d 8d04f580e44000 8938 }
            // n = 6, score = 200
            //   33f6                 | xor                 esi, esi
            //   bf????????           |                     
            //   833cf584e4400001     | cmp                 dword ptr [esi*8 + 0x40e484], 1
            //   751d                 | jne                 0x1f
            //   8d04f580e44000       | lea                 eax, [esi*8 + 0x40e480]
            //   8938                 | mov                 dword ptr [eax], edi

        $sequence_7 = { 6a06 89430c 8d4310 8d8924ea4000 5a 668b31 }
            // n = 6, score = 200
            //   6a06                 | push                6
            //   89430c               | mov                 dword ptr [ebx + 0xc], eax
            //   8d4310               | lea                 eax, [ebx + 0x10]
            //   8d8924ea4000         | lea                 ecx, [ecx + 0x40ea24]
            //   5a                   | pop                 edx
            //   668b31               | mov                 si, word ptr [ecx]

        $sequence_8 = { 0fbe84c158a54000 6a07 c1f804 59 8985a0fdffff 3bc1 0f87cb090000 }
            // n = 7, score = 200
            //   0fbe84c158a54000     | movsx               eax, byte ptr [ecx + eax*8 + 0x40a558]
            //   6a07                 | push                7
            //   c1f804               | sar                 eax, 4
            //   59                   | pop                 ecx
            //   8985a0fdffff         | mov                 dword ptr [ebp - 0x260], eax
            //   3bc1                 | cmp                 eax, ecx
            //   0f87cb090000         | ja                  0x9d1

        $sequence_9 = { 7505 bb00040000 837c241800 7508 }
            // n = 4, score = 200
            //   7505                 | jne                 7
            //   bb00040000           | mov                 ebx, 0x400
            //   837c241800           | cmp                 dword ptr [esp + 0x18], 0
            //   7508                 | jne                 0xa

    condition:
        7 of them and filesize < 163840
}
[TLP:WHITE] win_synflooder_w0   (20170521 | Malware or hack tool used by attackers in Operation Cleaver)
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
}
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