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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_murkytop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.murkytop"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 be???????? e8???????? 8b15???????? 8b0d???????? 85d2 7467 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   be????????           |                     
            //   e8????????           |                     
            //   8b15????????         |                     
            //   8b0d????????         |                     
            //   85d2                 | test                edx, edx
            //   7467                 | je                  0x69

        $sequence_1 = { bf???????? e8???????? 85c0 75ea 8b45fc 50 ff15???????? }
            // n = 7, score = 100
            //   bf????????           |                     
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   75ea                 | jne                 0xffffffec
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_2 = { 8bd9 e8???????? 85c0 7872 8b45dc 40 33db }
            // n = 7, score = 100
            //   8bd9                 | mov                 ebx, ecx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7872                 | js                  0x74
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   40                   | inc                 eax
            //   33db                 | xor                 ebx, ebx

        $sequence_3 = { 8b483c 51 8b5038 52 53 57 }
            // n = 6, score = 100
            //   8b483c               | mov                 ecx, dword ptr [eax + 0x3c]
            //   51                   | push                ecx
            //   8b5038               | mov                 edx, dword ptr [eax + 0x38]
            //   52                   | push                edx
            //   53                   | push                ebx
            //   57                   | push                edi

        $sequence_4 = { 85c0 0f855d010000 ff15???????? 83f87a 0f854e010000 8b75f8 56 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   0f855d010000         | jne                 0x163
            //   ff15????????         |                     
            //   83f87a               | cmp                 eax, 0x7a
            //   0f854e010000         | jne                 0x154
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]
            //   56                   | push                esi

        $sequence_5 = { 3b5e1c 0f8370ffffff 8b4808 03c8 }
            // n = 4, score = 100
            //   3b5e1c               | cmp                 ebx, dword ptr [esi + 0x1c]
            //   0f8370ffffff         | jae                 0xffffff76
            //   8b4808               | mov                 ecx, dword ptr [eax + 8]
            //   03c8                 | add                 ecx, eax

        $sequence_6 = { 6880000000 68ffff0000 57 ff15???????? c745c805000000 895dcc 89bdc4feffff }
            // n = 7, score = 100
            //   6880000000           | push                0x80
            //   68ffff0000           | push                0xffff
            //   57                   | push                edi
            //   ff15????????         |                     
            //   c745c805000000       | mov                 dword ptr [ebp - 0x38], 5
            //   895dcc               | mov                 dword ptr [ebp - 0x34], ebx
            //   89bdc4feffff         | mov                 dword ptr [ebp - 0x13c], edi

        $sequence_7 = { 0f844e010000 6a00 6a00 50 68???????? }
            // n = 5, score = 100
            //   0f844e010000         | je                  0x154
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_8 = { 68???????? 50 e8???????? 83c408 85c0 7513 68???????? }
            // n = 7, score = 100
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7513                 | jne                 0x15
            //   68????????           |                     

        $sequence_9 = { 89b544feffff c78540feffff01000000 8845e7 8945fc }
            // n = 4, score = 100
            //   89b544feffff         | mov                 dword ptr [ebp - 0x1bc], esi
            //   c78540feffff01000000     | mov    dword ptr [ebp - 0x1c0], 1
            //   8845e7               | mov                 byte ptr [ebp - 0x19], al
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

    condition:
        7 of them and filesize < 294912
}
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