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 (20221125 | Detects win.cheesetray.)
rule win_cheesetray_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.cheesetray."
        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.cheesetray"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 03fe 6a14 57 897d10 ffd1 }
            // n = 5, score = 200
            //   03fe                 | add                 edi, esi
            //   6a14                 | push                0x14
            //   57                   | push                edi
            //   897d10               | mov                 dword ptr [ebp + 0x10], edi
            //   ffd1                 | call                ecx

        $sequence_1 = { 13ca 8935???????? 890d???????? eb17 8bc8 8bda 8bc6 }
            // n = 7, score = 200
            //   13ca                 | adc                 ecx, edx
            //   8935????????         |                     
            //   890d????????         |                     
            //   eb17                 | jmp                 0x19
            //   8bc8                 | mov                 ecx, eax
            //   8bda                 | mov                 ebx, edx
            //   8bc6                 | mov                 eax, esi

        $sequence_2 = { e8???????? 83c404 894660 83f805 7722 399e88000000 7413 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   894660               | mov                 dword ptr [esi + 0x60], eax
            //   83f805               | cmp                 eax, 5
            //   7722                 | ja                  0x24
            //   399e88000000         | cmp                 dword ptr [esi + 0x88], ebx
            //   7413                 | je                  0x15

        $sequence_3 = { 668985a8efffff e8???????? 8b5d08 68c0d40100 6800080000 }
            // n = 5, score = 200
            //   668985a8efffff       | mov                 word ptr [ebp - 0x1058], ax
            //   e8????????           |                     
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   68c0d40100           | push                0x1d4c0
            //   6800080000           | push                0x800

        $sequence_4 = { 6a00 50 8bd9 c68500c0ffff00 e8???????? 83c40c }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8bd9                 | mov                 ebx, ecx
            //   c68500c0ffff00       | mov                 byte ptr [ebp - 0x4000], 0
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_5 = { c3 56 50 6a00 6a01 }
            // n = 5, score = 200
            //   c3                   | ret                 
            //   56                   | push                esi
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a01                 | push                1

        $sequence_6 = { 720e 8b4c2410 3b4c2420 0f83b1000000 8b3d???????? 8d9b00000000 68ff1f0000 }
            // n = 7, score = 200
            //   720e                 | jb                  0x10
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   3b4c2420             | cmp                 ecx, dword ptr [esp + 0x20]
            //   0f83b1000000         | jae                 0xb7
            //   8b3d????????         |                     
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   68ff1f0000           | push                0x1fff

        $sequence_7 = { 8b16 33c0 83c418 6639442428 7410 8da42400000000 40 }
            // n = 7, score = 200
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   33c0                 | xor                 eax, eax
            //   83c418               | add                 esp, 0x18
            //   6639442428           | cmp                 word ptr [esp + 0x28], ax
            //   7410                 | je                  0x12
            //   8da42400000000       | lea                 esp, [esp]
            //   40                   | inc                 eax

        $sequence_8 = { 85ff 7418 8bc7 e8???????? 8bc8 8944241c }
            // n = 6, score = 200
            //   85ff                 | test                edi, edi
            //   7418                 | je                  0x1a
            //   8bc7                 | mov                 eax, edi
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax

        $sequence_9 = { 8b140b 8d442414 50 6a05 52 6a00 ffd7 }
            // n = 7, score = 200
            //   8b140b               | mov                 edx, dword ptr [ebx + ecx]
            //   8d442414             | lea                 eax, [esp + 0x14]
            //   50                   | push                eax
            //   6a05                 | push                5
            //   52                   | push                edx
            //   6a00                 | push                0
            //   ffd7                 | call                edi

    condition:
        7 of them and filesize < 8626176
}
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