dcrat | 7de778c5153ba0ae2157f8a3ea78ef402c63d014a9fa719257cee24089e4a88f

max time kernel
29s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20230703-en
resource tags

arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
submitted
26/08/2023, 13:37

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General

Target

YammiBeta.exe
Size

1.1MB
MD5

6b5050c12abc27bad622f9af8ed7ebe3
SHA1

506be642a7d276c783bfd32a754a9bd1373abaea
SHA256

7de778c5153ba0ae2157f8a3ea78ef402c63d014a9fa719257cee24089e4a88f
SHA512

22ffa4c6afd0661307ca1a3a349e19f9fbb8739e382e2fea7b1ec59200c3d7ca06241b2f5154246ce2b8165da26eac31e70f2a0f4ff586e5b09cf0c993b2d319
SSDEEP

24576:348l0DlMFVPNpQiWq5KMsEINq4pXCxTRg/9QyGTlouInmUf/6ix5GWZ:35yeVPRWq5KMspBpX+wLEojnm3RE

Score

10^/10

dcrat infostealer rat

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

DCRat payload 6 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral3/files/0x0006000000023210-12.dat	dcrat
behavioral3/files/0x0006000000023210-14.dat	dcrat
behavioral3/files/0x0006000000023210-15.dat	dcrat
behavioral3/files/0x0006000000023213-28.dat	dcrat
behavioral3/files/0x0006000000023213-30.dat	dcrat
behavioral3/memory/4264-31-0x0000000000FB0000-0x0000000001130000-memory.dmp	dcrat

Downloads MZ/PE file

Executes dropped EXE 2 IoCs

pid	Process
1752	Loader.exe
4264	MsServerfont.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs

pid	Process
1808	YammiBeta.exe
1808	YammiBeta.exe
1808	YammiBeta.exe
1808	YammiBeta.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-618519468-4027732583-1827558364-1000_Classes\Local Settings	Loader.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1808	YammiBeta.exe
Token: SeDebugPrivilege	4264	MsServerfont.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1808	YammiBeta.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1808 wrote to memory of 1752	1808	YammiBeta.exe	90
PID 1808 wrote to memory of 1752	1808	YammiBeta.exe	90
PID 1808 wrote to memory of 1752	1808	YammiBeta.exe	90
PID 1752 wrote to memory of 4140	1752	Loader.exe	91
PID 1752 wrote to memory of 4140	1752	Loader.exe	91
PID 1752 wrote to memory of 4140	1752	Loader.exe	91
PID 4140 wrote to memory of 4984	4140	WScript.exe	92
PID 4140 wrote to memory of 4984	4140	WScript.exe	92
PID 4140 wrote to memory of 4984	4140	WScript.exe	92
PID 4984 wrote to memory of 4264	4984	cmd.exe	94
PID 4984 wrote to memory of 4264	4984	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\YammiBeta.exe
"C:\Users\Admin\AppData\Local\Temp\YammiBeta.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1808
- C:\Users\Admin\AppData\Local\Temp\Loader.exe
  "C:\Users\Admin\AppData\Local\Temp\Loader.exe"
  2⤵
  - Executes dropped EXE
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:1752
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\HyperCrtsvc\RlJdCeTbjnR.vbe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4140
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\HyperCrtsvc\xD4oxlRfvWBkgaTyTKGRnb.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4984
    - - C:\Users\Admin\AppData\Local\Temp\HyperCrtsvc\MsServerfont.exe
        
        "C:\Users\Admin\AppData\Local\Temp\HyperCrtsvc\MsServerfont.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        PID:4264

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\HyperCrtsvc\MsServerfont.exe

Filesize
1.5MB

MD5
18ae88963bf2b89b3ea24f1cd998c0dd

SHA1
0200af4fb7dbe83bb230f2ebf14c3561b4f2af85

SHA256
1b1e4e67bcb116b6e6a7fd6f9f717853b8b8c490b959f161eae356eda25992e9

SHA512
16c280ab0a242a13075c249b615a8f013e614eed240e37e20565c31078d14f917fb96559915a056279c4747d1d319b3ed9915141883991fa019ea6e6332d9157

Download Submit
C:\Users\Admin\AppData\Local\Temp\HyperCrtsvc\MsServerfont.exe

Filesize
1.5MB

MD5
18ae88963bf2b89b3ea24f1cd998c0dd

SHA1
0200af4fb7dbe83bb230f2ebf14c3561b4f2af85

SHA256
1b1e4e67bcb116b6e6a7fd6f9f717853b8b8c490b959f161eae356eda25992e9

SHA512
16c280ab0a242a13075c249b615a8f013e614eed240e37e20565c31078d14f917fb96559915a056279c4747d1d319b3ed9915141883991fa019ea6e6332d9157

Download Submit
C:\Users\Admin\AppData\Local\Temp\HyperCrtsvc\RlJdCeTbjnR.vbe

Filesize
214B

MD5
f246d91170758c560dcc804e79b689ce

SHA1
8e9820729c33e492c5d76722607a38379b1cbd38

SHA256
8558d7ec61aa5e0e6162d9f59103a6d3340cc359ee0526e765a061c6673a9665

SHA512
dcc48971a6a4a1b3af13a420a8de6ddfd765c780bfe76cbf1a459a855c14f0ca6510994fc988dfecd92257b99b41e2caf68025991ca80663331ce1c61110e5c8

Download Submit
C:\Users\Admin\AppData\Local\Temp\HyperCrtsvc\xD4oxlRfvWBkgaTyTKGRnb.bat

Filesize
37B

MD5
c87d31ff7b6bc8e971808bc819561137

SHA1
000f77a2d2596c87d3e2085ad74794b0627c034a

SHA256
738675ead6e7e54b7f0298824578cdfb659584a16f4f0cc2a0bdba654a482872

SHA512
34d995cf1fd3908a190aac08cefae4fb0d4fae7fd0cef2fb625a5e2d76864ce99724a2da4d1f05327bad80dab08f08038e17785e23c49087968e6c569964ffde

Download Submit
C:\Users\Admin\AppData\Local\Temp\Loader.exe

Filesize
1.7MB

MD5
fea5051ff55437d8510d9dba5159efba

SHA1
cc6dcfad3e10dc075ba815f2a1d815c97c95e0c3

SHA256
9d81caf5187bce5f5d2c1bf2b50d5c15b7f26bdc6ec954c8801bc358f0cfba5f

SHA512
796f7e8663206c9acbaf06aae656291821c02111a812bd9c71d62a18247ac6b2ef0cd27993dded6d08f6268e854207bba3c62e020afa8d06fee1e693b920daf5

Download Submit
C:\Users\Admin\AppData\Local\Temp\Loader.exe

Filesize
1.7MB

MD5
fea5051ff55437d8510d9dba5159efba

SHA1
cc6dcfad3e10dc075ba815f2a1d815c97c95e0c3

SHA256
9d81caf5187bce5f5d2c1bf2b50d5c15b7f26bdc6ec954c8801bc358f0cfba5f

SHA512
796f7e8663206c9acbaf06aae656291821c02111a812bd9c71d62a18247ac6b2ef0cd27993dded6d08f6268e854207bba3c62e020afa8d06fee1e693b920daf5

Download Submit
C:\Users\Admin\AppData\Local\Temp\Loader.exe

Filesize
1.7MB

MD5
fea5051ff55437d8510d9dba5159efba

SHA1
cc6dcfad3e10dc075ba815f2a1d815c97c95e0c3

SHA256
9d81caf5187bce5f5d2c1bf2b50d5c15b7f26bdc6ec954c8801bc358f0cfba5f

SHA512
796f7e8663206c9acbaf06aae656291821c02111a812bd9c71d62a18247ac6b2ef0cd27993dded6d08f6268e854207bba3c62e020afa8d06fee1e693b920daf5

Download Submit
memory/1808-4-0x0000000000980000-0x0000000000CFE000-memory.dmp

Filesize
3.5MB

Download
memory/1808-7-0x00000000036C0000-0x00000000036D0000-memory.dmp

Filesize
64KB

Download
memory/1808-6-0x00000000742A0000-0x0000000074A50000-memory.dmp

Filesize
7.7MB

Download
memory/1808-0-0x0000000000980000-0x0000000000CFE000-memory.dmp

Filesize
3.5MB

Download
memory/1808-25-0x00000000075F0000-0x0000000007B94000-memory.dmp

Filesize
5.6MB

Download
memory/1808-26-0x0000000007130000-0x00000000071C2000-memory.dmp

Filesize
584KB

Download
memory/1808-3-0x00000000036C0000-0x00000000036D0000-memory.dmp

Filesize
64KB

Download
memory/1808-2-0x00000000742A0000-0x0000000074A50000-memory.dmp

Filesize
7.7MB

Download
memory/1808-1-0x0000000000980000-0x0000000000CFE000-memory.dmp

Filesize
3.5MB

Download
memory/4264-31-0x0000000000FB0000-0x0000000001130000-memory.dmp

Filesize
1.5MB

Download
memory/4264-32-0x00007FFEF4C90000-0x00007FFEF5751000-memory.dmp

Filesize
10.8MB

Download
memory/4264-33-0x000000001BE70000-0x000000001BE80000-memory.dmp

Filesize
64KB

Download

Resubmissions

Analysis