SYMBOLCOMMON_NAMEaka. SYNONYMS
win.cheesetray (Back to overview)

CHEESETRAY

aka: CROWDEDFLOUNDER

Actor(s): Lazarus Group


CHEESETRAY is a sophisticated proxy-aware backdoor that can operate in both active and passive mode depending on the passed command-line parameters. The backdoor is capable of enumerating files and processes, enumerating drivers, enumerating remote desktop sessions, uploading and downloading files, creating and terminating processes, deleting files, creating a reverse shell, acting as a proxy server, and hijacking processes among its other functionality. The backdoor communicates with its C&C server using a custom binary protocol over TCP with port specified as a command-line parameter.

References
2020-02-25SentinelOneJim Walter
@online{walter:20200225:dprk:735f095, author = {Jim Walter}, title = {{DPRK Hidden Cobra Update: North Korean Malicious Cyber Activity}}, date = {2020-02-25}, organization = {SentinelOne}, url = {https://labs.sentinelone.com/dprk-hidden-cobra-update-north-korean-malicious-cyber-activity/}, language = {English}, urldate = {2020-02-27} } DPRK Hidden Cobra Update: North Korean Malicious Cyber Activity
ARTFULPIE BISTROMATH BUFFETLINE CHEESETRAY HOPLIGHT HOTCROISSANT SLICKSHOES
2020-02-14US-CERTUS-CERT
@online{uscert:20200214:malware:315814d, author = {US-CERT}, title = {{Malware Analysis Report (AR20-045C)}}, date = {2020-02-14}, organization = {US-CERT}, url = {https://www.us-cert.gov/ncas/analysis-reports/ar20-045c}, language = {English}, urldate = {2020-02-14} } Malware Analysis Report (AR20-045C)
CHEESETRAY
2018FireEyeFireEye
@techreport{fireeye:2018:apt38:c81b87d, author = {FireEye}, title = {{APT38}}, date = {2018}, institution = {FireEye}, url = {https://www.fireeye.com/content/dam/fireeye-www/current-threats/pdfs/pf/apt/rpt-apt38-2018.pdf}, language = {English}, urldate = {2020-01-07} } APT38
CHEESETRAY CLEANTOAD NACHOCHEESE
Yara Rules
[TLP:WHITE] win_cheesetray_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_cheesetray_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.cheesetray"
        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 = { 85c0 0f8498000000 8b4528 85c0 7407 50 }
            // n = 6, score = 200
            //   85c0                 | test                eax, eax
            //   0f8498000000         | je                  0x9e
            //   8b4528               | mov                 eax, dword ptr [ebp + 0x28]
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   50                   | push                eax

        $sequence_1 = { 8b4d0c 2bc6 1bcf 894508 0bc1 894d0c }
            // n = 6, score = 200
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   2bc6                 | sub                 eax, esi
            //   1bcf                 | sbb                 ecx, edi
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   0bc1                 | or                  eax, ecx
            //   894d0c               | mov                 dword ptr [ebp + 0xc], ecx

        $sequence_2 = { 6a00 57 51 50 56 6a00 6a00 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   57                   | push                edi
            //   51                   | push                ecx
            //   50                   | push                eax
            //   56                   | push                esi
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_3 = { 8b048dc81b4400 8bfa 99 03f0 8b45f8 13fa }
            // n = 6, score = 200
            //   8b048dc81b4400       | mov                 eax, dword ptr [ecx*4 + 0x441bc8]
            //   8bfa                 | mov                 edi, edx
            //   99                   | cdq                 
            //   03f0                 | add                 esi, eax
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   13fa                 | adc                 edi, edx

        $sequence_4 = { ba00040000 8db424c0000000 c74424106e006500 c744241474007300 c744241868002000 c744241c66006900 c744242072006500 }
            // n = 7, score = 200
            //   ba00040000           | mov                 edx, 0x400
            //   8db424c0000000       | lea                 esi, [esp + 0xc0]
            //   c74424106e006500     | mov                 dword ptr [esp + 0x10], 0x65006e
            //   c744241474007300     | mov                 dword ptr [esp + 0x14], 0x730074
            //   c744241868002000     | mov                 dword ptr [esp + 0x18], 0x200068
            //   c744241c66006900     | mov                 dword ptr [esp + 0x1c], 0x690066
            //   c744242072006500     | mov                 dword ptr [esp + 0x20], 0x650072

        $sequence_5 = { 83c408 f7d8 1bc0 f7d8 5f 5e 8be5 }
            // n = 7, score = 200
            //   83c408               | add                 esp, 8
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   f7d8                 | neg                 eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp

        $sequence_6 = { 8944245a 8944245e 89442462 89442466 8944243a 8944243e 89442442 }
            // n = 7, score = 200
            //   8944245a             | mov                 dword ptr [esp + 0x5a], eax
            //   8944245e             | mov                 dword ptr [esp + 0x5e], eax
            //   89442462             | mov                 dword ptr [esp + 0x62], eax
            //   89442466             | mov                 dword ptr [esp + 0x66], eax
            //   8944243a             | mov                 dword ptr [esp + 0x3a], eax
            //   8944243e             | mov                 dword ptr [esp + 0x3e], eax
            //   89442442             | mov                 dword ptr [esp + 0x42], eax

        $sequence_7 = { 6a00 50 c784248400000000000000 e8???????? 83c414 33c0 6a44 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   50                   | push                eax
            //   c784248400000000000000     | mov    dword ptr [esp + 0x84], 0
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   33c0                 | xor                 eax, eax
            //   6a44                 | push                0x44

        $sequence_8 = { e8???????? 8b45f8 83c40c 53 53 8d4dec 51 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   83c40c               | add                 esp, 0xc
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   51                   | push                ecx

        $sequence_9 = { 7478 33f6 397358 741a 8b4354 8b4b50 }
            // n = 6, score = 200
            //   7478                 | je                  0x7a
            //   33f6                 | xor                 esi, esi
            //   397358               | cmp                 dword ptr [ebx + 0x58], esi
            //   741a                 | je                  0x1c
            //   8b4354               | mov                 eax, dword ptr [ebx + 0x54]
            //   8b4b50               | mov                 ecx, dword ptr [ebx + 0x50]

    condition:
        7 of them and filesize < 8626176
}
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