clop

Tácticas y técnicas observadas del actor, mapeadas a MITRE ATT&CK (clic para ver la ficha oficial). Útil para priorizar detecciones.

Firma de detección defensiva para este grupo (úsala en tu EDR/SIEM). Fuente: ransomware.live.

rule win_clop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.clop."
        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.clop"
        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 = { 6a04 6800300000 6887000000 6a00 }
            // n = 4, score = 900
            //   6a04                 | push                4
            //   6800300000           | push                0x3000
            //   6887000000           | push                0x87
            //   6a00                 | push                0

        $sequence_1 = { 83c40c 6860070000 6a40 ff15???????? }
            // n = 4, score = 900
            //   83c40c               | add                 esp, 0xc
            //   6860070000           | push                0x760
            //   6a40                 | push                0x40
            //   ff15????????         |                     

        $sequence_2 = { 56 53 ff15???????? 50 ff15???????? 56 53 }
            // n = 7, score = 800
            //   56                   | push                esi
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   56                   | push                esi
            //   53                   | push                ebx

        $sequence_3 = { ff15???????? 56 53 8bf8 ff15???????? 8bf0 56 }
            // n = 7, score = 800
            //   ff15????????         |                     
            //   56                   | push                esi
            //   53                   | push                ebx
            //   8bf8                 | mov                 edi, eax
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   56                   | push                esi

        $sequence_4 = { 6a00 ff15???????? 68???????? 8bd8 }
            // n = 4, score = 800
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   68????????           |                     
            //   8bd8                 | mov                 ebx, eax

        $sequence_5 = { 833d????????00 0f842e0c0000 83ec08 0fae5c2404 8b442404 25807f0000 3d801f0000 }
            // n = 7, score = 700
            //   833d????????00       |                     
            //   0f842e0c0000         | je                  0xc34
            //   83ec08               | sub                 esp, 8
            //   0fae5c2404           | stmxcsr             dword ptr [esp + 4]
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   25807f0000           | and                 eax, 0x7f80
            //   3d801f0000           | cmp                 eax, 0x1f80

        $sequence_6 = { 6683f87f 8d642408 0f85fd0b0000 eb00 }
            // n = 4, score = 700
            //   6683f87f             | cmp                 ax, 0x7f
            //   8d642408             | lea                 esp, [esp + 8]
            //   0f85fd0b0000         | jne                 0xc03
            //   eb00                 | jmp                 2

        $sequence_7 = { db2d???????? b802000000 833d????????00 0f85f0080000 }
            // n = 4, score = 700
            //   db2d????????         |                     
            //   b802000000           | mov                 eax, 2
            //   833d????????00       |                     
            //   0f85f0080000         | jne                 0x8f6

        $sequence_8 = { 50 ff15???????? 83c40c 6860070000 }
            // n = 4, score = 600
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   6860070000           | push                0x760

        $sequence_9 = { 0f85aa010000 68???????? 8d442450 50 }
            // n = 4, score = 500
            //   0f85aa010000         | jne                 0x1b0
            //   68????????           |                     
            //   8d442450             | lea                 eax, [esp + 0x50]
            //   50                   | push                eax

        $sequence_10 = { 5d c20400 56 ff15???????? 6a00 }
            // n = 5, score = 500
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   56                   | push                esi
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_11 = { 8b1d???????? 8d85d4f7ffff 68???????? 50 ffd3 8d85d4f7ffff }
            // n = 6, score = 500
            //   8b1d????????         |                     
            //   8d85d4f7ffff         | lea                 eax, [ebp - 0x82c]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd3                 | call                ebx
            //   8d85d4f7ffff         | lea                 eax, [ebp - 0x82c]

        $sequence_12 = { 8d85bcefffff 50 ff15???????? 68???????? }
            // n = 4, score = 500
            //   8d85bcefffff         | lea                 eax, [ebp - 0x1044]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   68????????           |                     

        $sequence_13 = { ff15???????? 68???????? 8d85dcf7ffff 50 }
            // n = 4, score = 500
            //   ff15????????         |                     
            //   68????????           |                     
            //   8d85dcf7ffff         | lea                 eax, [ebp - 0x824]
            //   50                   | push                eax

        $sequence_14 = { 68???????? 68???????? e8???????? 83c424 6aff }
            // n = 5, score = 500
            //   68????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   83c424               | add                 esp, 0x24
            //   6aff                 | push                -1

        $sequence_15 = { ffd0 c3 8bff 55 8bec 83ec1c 8d4de4 }
            // n = 7, score = 500
            //   ffd0                 | call                eax
            //   c3                   | ret                 
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec1c               | sub                 esp, 0x1c
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]

        $sequence_16 = { 6a00 e8???????? 83c408 6aff ff15???????? }
            // n = 5, score = 400
            //   6a00                 | push                0
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   6aff                 | push                -1
            //   ff15????????         |                     

        $sequence_17 = { 83c424 53 50 ffd6 }
            // n = 4, score = 300
            //   83c424               | add                 esp, 0x24
            //   53                   | push                ebx
            //   50                   | push                eax
            //   ffd6                 | call                esi

        $sequence_18 = { 83c40c 33f6 85ff 7428 }
            // n = 4, score = 300
            //   83c40c               | add                 esp, 0xc
            //   33f6                 | xor                 esi, esi
            //   85ff                 | test                edi, edi
            //   7428                 | je                  0x2a

        $sequence_19 = { 6aff ffd7 8b4dfc 33c0 }
            // n = 4, score = 300
            //   6aff                 | push                -1
            //   ffd7                 | call                edi
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33c0                 | xor                 eax, eax

        $sequence_20 = { 6a00 51 ffb560e2ffff 50 }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   ffb560e2ffff         | push                dword ptr [ebp - 0x1da0]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 796672
}

Attention!
We are the ones who hacked you and DOWNLOAD yor data!
We have extensive experience and a strong reputation in this field.
Take what is written below seriously!!!!
We DOWNLOADED - 1,65 Tb
We DOWNLOADED - Your financial documentation, HR Documents, Accounting, your mails,Databases,private correspondence about transactions, employee documents, company documents,Internal manuals, production data,  and much more .
If necessary, we are ready to provide all the evidence.
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• https://www.ransomware.live/group/clop

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