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 (20210616 | Detects win.murkytop.)
rule win_murkytop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.murkytop."
        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.murkytop"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 8d340b e8???????? 68???????? e8???????? 8b45f4 40 83c404 }
            // n = 7, score = 100
            //   8d340b               | lea                 esi, dword ptr [ebx + ecx]
            //   e8????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   40                   | inc                 eax
            //   83c404               | add                 esp, 4

        $sequence_1 = { 3bce 7736 2bf1 d1fe 3b05???????? 7510 }
            // n = 6, score = 100
            //   3bce                 | cmp                 ecx, esi
            //   7736                 | ja                  0x38
            //   2bf1                 | sub                 esi, ecx
            //   d1fe                 | sar                 esi, 1
            //   3b05????????         |                     
            //   7510                 | jne                 0x12

        $sequence_2 = { 50 68???????? e8???????? 8b45fc 8b4868 51 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b4868               | mov                 ecx, dword ptr [eax + 0x68]
            //   51                   | push                ecx

        $sequence_3 = { 83ff02 7d15 68???????? e8???????? }
            // n = 4, score = 100
            //   83ff02               | cmp                 edi, 2
            //   7d15                 | jge                 0x17
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_4 = { 85c0 7450 8b4df4 8d55d8 52 6a04 8d45f0 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7450                 | je                  0x52
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   8d55d8               | lea                 edx, dword ptr [ebp - 0x28]
            //   52                   | push                edx
            //   6a04                 | push                4
            //   8d45f0               | lea                 eax, dword ptr [ebp - 0x10]

        $sequence_5 = { 59 59 c3 8bff 55 8bec f6400c40 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   f6400c40             | test                byte ptr [eax + 0xc], 0x40

        $sequence_6 = { 8903 5d c20400 8d5002 668b08 83c002 6685c9 }
            // n = 7, score = 100
            //   8903                 | mov                 dword ptr [ebx], eax
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   8d5002               | lea                 edx, dword ptr [eax + 2]
            //   668b08               | mov                 cx, word ptr [eax]
            //   83c002               | add                 eax, 2
            //   6685c9               | test                cx, cx

        $sequence_7 = { 8945c4 33c9 66894db0 8945b2 8945b6 8945ba 668945be }
            // n = 7, score = 100
            //   8945c4               | mov                 dword ptr [ebp - 0x3c], eax
            //   33c9                 | xor                 ecx, ecx
            //   66894db0             | mov                 word ptr [ebp - 0x50], cx
            //   8945b2               | mov                 dword ptr [ebp - 0x4e], eax
            //   8945b6               | mov                 dword ptr [ebp - 0x4a], eax
            //   8945ba               | mov                 dword ptr [ebp - 0x46], eax
            //   668945be             | mov                 word ptr [ebp - 0x42], ax

        $sequence_8 = { 56 57 8d8544feffff 50 6802020000 ff15???????? 68???????? }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   8d8544feffff         | lea                 eax, dword ptr [ebp - 0x1bc]
            //   50                   | push                eax
            //   6802020000           | push                0x202
            //   ff15????????         |                     
            //   68????????           |                     

        $sequence_9 = { 83c404 eb0e 50 68???????? e8???????? 83c408 8b5d08 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   eb0e                 | jmp                 0x10
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]

    condition:
        7 of them and filesize < 294912
}
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