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 7 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
		4016	schtasks.exe
		844	schtasks.exe
		4312	schtasks.exe
		4756	schtasks.exe
		3944	schtasks.exe
		700	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 6 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	4016	4344	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	844	4344	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4312	4344	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4756	4344	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3944	4344	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	700	4344	schtasks.exe	89

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023c9d-10.dat	dcrat
behavioral2/memory/2308-13-0x00000000003F0000-0x0000000000602000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	brokerDhcpdriverref.exe

Executes dropped EXE 2 IoCs

pid	Process
2308	brokerDhcpdriverref.exe
4356	unsecapp.exe

Adds Run key to start application 2 TTPs 6 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\RuntimeBroker = "\"C:\\Recovery\\WindowsRE\\RuntimeBroker.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Windows\\System32\\wbem\\netttcim_uninstall\\unsecapp.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Documents and Settings\\lsass.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:\\Windows\\System32\\DeliveryOptimizationMIProvUninstall\\lsass.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\brokerDhcpdriverref = "\"C:\\brokerDhcp\\ZZ2hXACs\\brokerDhcpdriverref.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Registry = "\"C:\\Recovery\\WindowsRE\\Registry.exe\""	brokerDhcpdriverref.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\System32\wbem\netttcim_uninstall\unsecapp.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\wbem\netttcim_uninstall\29c1c3cc0f76855c7e7456076a4ffc27e4947119	brokerDhcpdriverref.exe
File created	C:\Windows\System32\DeliveryOptimizationMIProvUninstall\lsass.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\DeliveryOptimizationMIProvUninstall\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	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

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	brokerDhcpdriverref.exe
Key created	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000_Classes\Local Settings	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4312	schtasks.exe
4756	schtasks.exe
3944	schtasks.exe
700	schtasks.exe
4016	schtasks.exe
844	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2308	brokerDhcpdriverref.exe
2308	brokerDhcpdriverref.exe
2308	brokerDhcpdriverref.exe
2308	brokerDhcpdriverref.exe
2308	brokerDhcpdriverref.exe
2308	brokerDhcpdriverref.exe
4356	unsecapp.exe
4356	unsecapp.exe
4356	unsecapp.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2308	brokerDhcpdriverref.exe
Token: SeDebugPrivilege	4356	unsecapp.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 660 wrote to memory of 3504	660	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	83
PID 660 wrote to memory of 3504	660	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	83
PID 660 wrote to memory of 3504	660	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	83
PID 3504 wrote to memory of 4496	3504	WScript.exe	93
PID 3504 wrote to memory of 4496	3504	WScript.exe	93
PID 3504 wrote to memory of 4496	3504	WScript.exe	93
PID 4496 wrote to memory of 2308	4496	cmd.exe	95
PID 4496 wrote to memory of 2308	4496	cmd.exe	95
PID 2308 wrote to memory of 4824	2308	brokerDhcpdriverref.exe	102
PID 2308 wrote to memory of 4824	2308	brokerDhcpdriverref.exe	102
PID 4824 wrote to memory of 4764	4824	cmd.exe	104
PID 4824 wrote to memory of 4764	4824	cmd.exe	104
PID 4824 wrote to memory of 4356	4824	cmd.exe	110
PID 4824 wrote to memory of 4356	4824	cmd.exe	110

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
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:660
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\brokerDhcp\S0tGSQFMCx6Y.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3504
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\brokerDhcp\ZZ2hXACs.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4496
  - - C:\brokerDhcp\brokerDhcpdriverref.exe
      "C:\brokerDhcp\brokerDhcpdriverref.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2308
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\qISrJGotlN.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4824
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4764
      - C:\Windows\System32\wbem\netttcim_uninstall\unsecapp.exe
        
        "C:\Windows\System32\wbem\netttcim_uninstall\unsecapp.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4356

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Registry.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:844

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Windows\System32\wbem\netttcim_uninstall\unsecapp.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4312

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Documents and Settings\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4756

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\DeliveryOptimizationMIProvUninstall\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3944

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "brokerDhcpdriverref" /sc ONLOGON /tr "'C:\brokerDhcp\ZZ2hXACs\brokerDhcpdriverref.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:700

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

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\qISrJGotlN.bat

Filesize
220B

MD5
ad2262eb9b9089f53cc190dc6e40a345

SHA1
fb38782bbbd70f42031875a1e31d63bc72eb2df3

SHA256
2365134525eeeca67f43494363df50e496c08dec653701680de1360d0b79cf72

SHA512
f2bb83328b0923ad1c2437c1bcb576cd734181b35a8f3836f5a9b4bb94980db2757a9ae911dc77107e25ff40d748d204482a2c5426c737470e2a300f2c557f0b

Download Submit
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
C:\brokerDhcp\brokerDhcpdriverref.exe

Filesize
2.0MB

MD5
c07cdd8d27b5b968b06166ceddcfd35a

SHA1
419905135ad7276f36edd5654ff50643875d52b3

SHA256
6b350fefc7d6ca79ca3e4cef39b4e71e7459d98ef213693ae3cec2c1b1d03863

SHA512
01ddba53ed10452aeefde7aa2bcb289d75d5ce90fe0771183d5abc5f3a178d20b5495381084e75e858130bf31dbdd33edf82d51c96d1e4a99ee4c21bf97327ed

Download Submit
memory/2308-12-0x00007FFCD3873000-0x00007FFCD3875000-memory.dmp

Filesize
8KB

Download
memory/2308-13-0x00000000003F0000-0x0000000000602000-memory.dmp

Filesize
2.1MB

Download
memory/4356-35-0x00000000029D0000-0x00000000029DE000-memory.dmp

Filesize
56KB

Download
memory/4356-36-0x00000000029F0000-0x0000000002A46000-memory.dmp

Filesize
344KB

Download
memory/4356-37-0x0000000002A40000-0x0000000002A4A000-memory.dmp

Filesize
40KB

Download
memory/4356-38-0x0000000002A60000-0x0000000002A68000-memory.dmp

Filesize
32KB

Download
memory/4356-39-0x0000000002A70000-0x0000000002A7C000-memory.dmp

Filesize
48KB

Download
memory/4356-40-0x000000001B5A0000-0x000000001B5A8000-memory.dmp

Filesize
32KB

Download
memory/4356-41-0x0000000002A50000-0x0000000002A58000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads