dcrat | 308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61

General

Target

308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe
Size

2.3MB
MD5

8856304a8bad8f3c4132c28042b8df80
SHA1

82adc02d2ccdc3485e6edb00ac36f71f2d804158
SHA256

308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61
SHA512

c5ab3dca5ad9c0577dcce69a6941259e67066141dc297e07a53b487ea0a51a68c9b79934ce443dc4a3f5e7eee65521cbc13b2f7afe7f594ee7ec5db59f484499
SSDEEP

49152:UbA300qL5o66QwgVAVph9QBoyycpwgPGdnDq3IEPU:UbV7oh9yycFODq3vPU

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 10 IoCs

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

rat infostealer dcrat

description	ioc	pid	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe
		1384	schtasks.exe
		596	schtasks.exe
		1088	schtasks.exe
		2648	schtasks.exe
		2916	schtasks.exe
		2844	schtasks.exe
		2596	schtasks.exe
		2848	schtasks.exe
		1104	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 9 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2648	2804	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2916	2804	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2844	2804	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2596	2804	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2848	2804	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1384	2804	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1104	2804	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1088	2804	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	596	2804	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000016d3a-9.dat	dcrat
behavioral1/memory/2672-13-0x00000000012D0000-0x00000000014E2000-memory.dmp	dcrat
behavioral1/memory/2292-38-0x0000000001150000-0x0000000001362000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2672	brokerDhcpdriverref.exe
2292	csrss.exe

Loads dropped DLL 2 IoCs

pid	Process
2624	cmd.exe
2624	cmd.exe

Adds Run key to start application 2 TTPs 9 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\NOISE\\taskhost.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Windows\\System32\\NlsData002a\\winlogon.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Windows\\System32\\PresentationNative_v0300\\services.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\Windows\\System32\\mfc140jpn\\services.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\brokerDhcp\\smss.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\Storprop\\csrss.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Windows\\System32\\RMActivate_ssp_isv\\lsm.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\cmd = "\"C:\\Windows\\SysWOW64\\softpub\\cmd.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\dmvscres\\dwm.exe\""	brokerDhcpdriverref.exe

Drops file in System32 directory 17 IoCs

description	ioc	Process
File created	C:\Windows\System32\dmvscres\dwm.exe	brokerDhcpdriverref.exe
File opened for modification	C:\Windows\System32\dmvscres\dwm.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\dmvscres\6cb0b6c459d5d3455a3da700e713f2e2529862ff	brokerDhcpdriverref.exe
File created	C:\Windows\SysWOW64\softpub\cmd.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\PresentationNative_v0300\services.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\Storprop\886983d96e3d3e31032c679b2d4ea91b6c05afef	brokerDhcpdriverref.exe
File created	C:\Windows\System32\NOISE\taskhost.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\NOISE\b75386f1303e64d8139363b71e44ac16341adf4e	brokerDhcpdriverref.exe
File created	C:\Windows\System32\RMActivate_ssp_isv\101b941d020240259ca4912829b53995ad543df6	brokerDhcpdriverref.exe
File created	C:\Windows\System32\PresentationNative_v0300\c5b4cb5e9653cce737f29f72ba880dd4c4bab27d	brokerDhcpdriverref.exe
File created	C:\Windows\System32\mfc140jpn\c5b4cb5e9653cce737f29f72ba880dd4c4bab27d	brokerDhcpdriverref.exe
File created	C:\Windows\System32\mfc140jpn\services.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\Storprop\csrss.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\RMActivate_ssp_isv\lsm.exe	brokerDhcpdriverref.exe
File created	C:\Windows\SysWOW64\softpub\ebf1f9fa8afd6d1932bd65bc4cc3af89a4c8e228	brokerDhcpdriverref.exe
File created	C:\Windows\System32\NlsData002a\winlogon.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\NlsData002a\cc11b995f2a76da408ea6a601e682e64743153ad	brokerDhcpdriverref.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2648	schtasks.exe
2916	schtasks.exe
1384	schtasks.exe
1104	schtasks.exe
1088	schtasks.exe
596	schtasks.exe
2844	schtasks.exe
2596	schtasks.exe
2848	schtasks.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2672	brokerDhcpdriverref.exe
2672	brokerDhcpdriverref.exe
2672	brokerDhcpdriverref.exe
2292	csrss.exe
2292	csrss.exe
2292	csrss.exe
2292	csrss.exe
2292	csrss.exe
2292	csrss.exe
2292	csrss.exe
2292	csrss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2672	brokerDhcpdriverref.exe
Token: SeDebugPrivilege	2292	csrss.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2100 wrote to memory of 2472	2100	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	31
PID 2100 wrote to memory of 2472	2100	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	31
PID 2100 wrote to memory of 2472	2100	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	31
PID 2100 wrote to memory of 2472	2100	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	31
PID 2472 wrote to memory of 2624	2472	WScript.exe	32
PID 2472 wrote to memory of 2624	2472	WScript.exe	32
PID 2472 wrote to memory of 2624	2472	WScript.exe	32
PID 2472 wrote to memory of 2624	2472	WScript.exe	32
PID 2624 wrote to memory of 2672	2624	cmd.exe	34
PID 2624 wrote to memory of 2672	2624	cmd.exe	34
PID 2624 wrote to memory of 2672	2624	cmd.exe	34
PID 2624 wrote to memory of 2672	2624	cmd.exe	34
PID 2672 wrote to memory of 2292	2672	brokerDhcpdriverref.exe	45
PID 2672 wrote to memory of 2292	2672	brokerDhcpdriverref.exe	45
PID 2672 wrote to memory of 2292	2672	brokerDhcpdriverref.exe	45

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe
"C:\Users\Admin\AppData\Local\Temp\308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2100
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\brokerDhcp\S0tGSQFMCx6Y.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2472
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\brokerDhcp\ZZ2hXACs.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2624
  - - C:\brokerDhcp\brokerDhcpdriverref.exe
      "C:\brokerDhcp\brokerDhcpdriverref.exe"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2672
    - - C:\Windows\System32\Storprop\csrss.exe
        
        "C:\Windows\System32\Storprop\csrss.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2292

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\dmvscres\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\PresentationNative_v0300\services.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\mfc140jpn\services.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2844

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\brokerDhcp\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2596

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\Storprop\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2848

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\NOISE\taskhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1384

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\RMActivate_ssp_isv\lsm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1104

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\Windows\SysWOW64\softpub\cmd.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1088

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\NlsData002a\winlogon.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:596

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\brokerDhcp\S0tGSQFMCx6Y.vbe

Filesize
195B

MD5
0272bf47a2ead1950910e1629e35e5b5

SHA1
74b43b7ce5697d8bfddd3ed416b03ba61b81fbac

SHA256
45547e2ed9186e7405f394fe1e3b58d61106b205d78c3dcbe8f80dd0c8e13fdd

SHA512
9a02cb88ef7e8d1ee80e4c5cb6612d933b11ce8f63c6518ebe8a58bfdbd08046666a1ebedd509ad0a1b7652d361fbb610008835a823737cb7421d81e19104465

Download Submit
C:\brokerDhcp\ZZ2hXACs.bat

Filesize
39B

MD5
7336dff7322860e242cf39fd2067a903

SHA1
b97bdf53351221778777388168217a736b9670bc

SHA256
f875da2b44bb1c16ae7ad33e3ac89f235bd1c85445672e8ee092f1a540fd4cea

SHA512
fb5e86ca89e961c5df3d6a0e4e6d30b8ab7f5d4445efa71e7706ce86f3201267a3bd8b45af80d8f5a694e451cd0f0d51a70954e0a5f8d6aec0ee5bc31139a687

Download Submit
\brokerDhcp\brokerDhcpdriverref.exe

Filesize
2.0MB

MD5
c07cdd8d27b5b968b06166ceddcfd35a

SHA1
419905135ad7276f36edd5654ff50643875d52b3

SHA256
6b350fefc7d6ca79ca3e4cef39b4e71e7459d98ef213693ae3cec2c1b1d03863

SHA512
01ddba53ed10452aeefde7aa2bcb289d75d5ce90fe0771183d5abc5f3a178d20b5495381084e75e858130bf31dbdd33edf82d51c96d1e4a99ee4c21bf97327ed

Download Submit
memory/2292-38-0x0000000001150000-0x0000000001362000-memory.dmp

Filesize
2.1MB

Download
memory/2292-39-0x00000000002C0000-0x00000000002CE000-memory.dmp

Filesize
56KB

Download
memory/2292-40-0x00000000002D0000-0x0000000000326000-memory.dmp

Filesize
344KB

Download
memory/2292-41-0x0000000000430000-0x000000000043A000-memory.dmp

Filesize
40KB

Download
memory/2292-42-0x0000000000440000-0x0000000000448000-memory.dmp

Filesize
32KB

Download
memory/2292-43-0x0000000000450000-0x000000000045C000-memory.dmp

Filesize
48KB

Download
memory/2292-44-0x0000000000460000-0x0000000000468000-memory.dmp

Filesize
32KB

Download
memory/2292-45-0x0000000000470000-0x0000000000478000-memory.dmp

Filesize
32KB

Download
memory/2672-13-0x00000000012D0000-0x00000000014E2000-memory.dmp

Filesize
2.1MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads