SYMBOLCOMMON_NAMEaka. SYNONYMS
win.murkytop (Back to overview)

murkytop

Actor(s): Leviathan


a command-line reconnaissance tool. It can be used to execute files as a different user, move, and delete files locally, schedule remote AT jobs, perform host discovery on connected networks, scan for open ports on hosts in a connected network, and retrieve information about the OS, users, groups, and shares on remote hosts.

References
2020SecureworksSecureWorks
@online{secureworks:2020:bronze:e8ad4fb, author = {SecureWorks}, title = {{BRONZE MOHAWK}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/bronze-mohawk}, language = {English}, urldate = {2020-05-23} } BRONZE MOHAWK
AIRBREAK scanbox BLACKCOFFEE CHINACHOPPER Cobalt Strike Derusbi homefry murkytop SeDll Leviathan
2018-03-16FireEyeFireEye
@online{fireeye:20180316:suspected:2a77316, author = {FireEye}, title = {{Suspected Chinese Cyber Espionage Group (TEMP.Periscope) Targeting U.S. Engineering and Maritime Industries}}, date = {2018-03-16}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2018/03/suspected-chinese-espionage-group-targeting-maritime-and-engineering-industries.html}, language = {English}, urldate = {2019-12-20} } Suspected Chinese Cyber Espionage Group (TEMP.Periscope) Targeting U.S. Engineering and Maritime Industries
badflick BLACKCOFFEE CHINACHOPPER homefry murkytop SeDll Leviathan
Yara Rules
[TLP:WHITE] win_murkytop_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_murkytop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.murkytop"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 8bd0 c1ea10 8bc8 81e2ff000000 52 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   8bd0                 | mov                 edx, eax
            //   c1ea10               | shr                 edx, 0x10
            //   8bc8                 | mov                 ecx, eax
            //   81e2ff000000         | and                 edx, 0xff
            //   52                   | push                edx

        $sequence_1 = { 55 8bec 83ec24 8d45f8 50 6a28 ff15???????? }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec24               | sub                 esp, 0x24
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   6a28                 | push                0x28
            //   ff15????????         |                     

        $sequence_2 = { 030c9de0f54100 eb02 8bca f641247f 7526 83f8ff 7419 }
            // n = 7, score = 100
            //   030c9de0f54100       | add                 ecx, dword ptr [ebx*4 + 0x41f5e0]
            //   eb02                 | jmp                 4
            //   8bca                 | mov                 ecx, edx
            //   f641247f             | test                byte ptr [ecx + 0x24], 0x7f
            //   7526                 | jne                 0x28
            //   83f8ff               | cmp                 eax, -1
            //   7419                 | je                  0x1b

        $sequence_3 = { 0fb60b 40 80b960cf410000 74e8 8a13 }
            // n = 5, score = 100
            //   0fb60b               | movzx               ecx, byte ptr [ebx]
            //   40                   | inc                 eax
            //   80b960cf410000       | cmp                 byte ptr [ecx + 0x41cf60], 0
            //   74e8                 | je                  0xffffffea
            //   8a13                 | mov                 dl, byte ptr [ebx]

        $sequence_4 = { 64892500000000 83ec08 b8bc120000 e8???????? 53 56 57 }
            // n = 7, score = 100
            //   64892500000000       | mov                 dword ptr fs:[0], esp
            //   83ec08               | sub                 esp, 8
            //   b8bc120000           | mov                 eax, 0x12bc
            //   e8????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_5 = { 8b5118 52 e8???????? 83c404 50 68???????? e8???????? }
            // n = 7, score = 100
            //   8b5118               | mov                 edx, dword ptr [ecx + 0x18]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_6 = { 0044fa40 0023 d18a0688078a 46 }
            // n = 4, score = 100
            //   0044fa40             | add                 byte ptr [edx + edi*8 + 0x40], al
            //   0023                 | add                 byte ptr [ebx], ah
            //   d18a0688078a         | ror                 dword ptr [edx - 0x75f877fa], 1
            //   46                   | inc                 esi

        $sequence_7 = { c1f805 56 8d3c85e0f54100 e8???????? 83e01f 59 }
            // n = 6, score = 100
            //   c1f805               | sar                 eax, 5
            //   56                   | push                esi
            //   8d3c85e0f54100       | lea                 edi, [eax*4 + 0x41f5e0]
            //   e8????????           |                     
            //   83e01f               | and                 eax, 0x1f
            //   59                   | pop                 ecx

        $sequence_8 = { c745f020000000 ff15???????? bb03000000 395d08 7d16 68???????? }
            // n = 6, score = 100
            //   c745f020000000       | mov                 dword ptr [ebp - 0x10], 0x20
            //   ff15????????         |                     
            //   bb03000000           | mov                 ebx, 3
            //   395d08               | cmp                 dword ptr [ebp + 8], ebx
            //   7d16                 | jge                 0x18
            //   68????????           |                     

        $sequence_9 = { 0fb7c1 0fbe8000634100 83e00f eb02 33c0 0fbe84c220634100 6a07 }
            // n = 7, score = 100
            //   0fb7c1               | movzx               eax, cx
            //   0fbe8000634100       | movsx               eax, byte ptr [eax + 0x416300]
            //   83e00f               | and                 eax, 0xf
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   0fbe84c220634100     | movsx               eax, byte ptr [edx + eax*8 + 0x416320]
            //   6a07                 | push                7

    condition:
        7 of them and filesize < 294912
}
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