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 6 IoCs

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

rat infostealer dcrat

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exe308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exeschtasks.exe

description	ioc	pid	Process
		1212	schtasks.exe
		1940	schtasks.exe
		5068	schtasks.exe
		2944	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe
		4992	schtasks.exe

Dcrat family
dcrat

Process spawned unexpected child process 5 IoCs

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

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4992	4088	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1212	4088	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1940	4088	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5068	4088	schtasks.exe	89
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2944	4088	schtasks.exe	89

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral2/files/0x0007000000023cb3-10.dat	dcrat
behavioral2/memory/1232-13-0x00000000005B0000-0x00000000007C2000-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

Processes:

brokerDhcpdriverref.exe308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exeWScript.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	brokerDhcpdriverref.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 2 IoCs

Processes:

brokerDhcpdriverref.exeunsecapp.exe

pid	Process
1232	brokerDhcpdriverref.exe
1516	unsecapp.exe

Adds Run key to start application 2 TTPs 5 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

brokerDhcpdriverref.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Windows\\System32\\Microsoft.Management.Infrastructure.Native.Unmanaged\\winlogon.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\unsecapp = "\"C:\\Documents and Settings\\unsecapp.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Windows\\System32\\mskeyprotcli\\fontdrvhost.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\upfc = "\"C:\\Recovery\\WindowsRE\\upfc.exe\""	brokerDhcpdriverref.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\wowreg32\\dllhost.exe\""	brokerDhcpdriverref.exe

Drops file in System32 directory 7 IoCs

Processes:

brokerDhcpdriverref.exe

description	ioc	Process
File opened for modification	C:\Windows\System32\Microsoft.Management.Infrastructure.Native.Unmanaged\winlogon.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\Microsoft.Management.Infrastructure.Native.Unmanaged\cc11b995f2a76da408ea6a601e682e64743153ad	brokerDhcpdriverref.exe
File created	C:\Windows\System32\mskeyprotcli\fontdrvhost.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\mskeyprotcli\5b884080fd4f94e2695da25c503f9e33b9605b83	brokerDhcpdriverref.exe
File created	C:\Windows\System32\wowreg32\dllhost.exe	brokerDhcpdriverref.exe
File created	C:\Windows\System32\wowreg32\5940a34987c99120d96dace90a3f93f329dcad63	brokerDhcpdriverref.exe
File created	C:\Windows\System32\Microsoft.Management.Infrastructure.Native.Unmanaged\winlogon.exe	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

Processes:

308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exeWScript.execmd.exe

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 1 IoCs

Processes:

308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 5 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	Process
4992	schtasks.exe
1212	schtasks.exe
1940	schtasks.exe
5068	schtasks.exe
2944	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

brokerDhcpdriverref.exeunsecapp.exe

pid	Process
1232	brokerDhcpdriverref.exe
1232	brokerDhcpdriverref.exe
1232	brokerDhcpdriverref.exe
1232	brokerDhcpdriverref.exe
1232	brokerDhcpdriverref.exe
1516	unsecapp.exe
1516	unsecapp.exe
1516	unsecapp.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

brokerDhcpdriverref.exeunsecapp.exe

description	pid	Process
Token: SeDebugPrivilege	1232	brokerDhcpdriverref.exe
Token: SeDebugPrivilege	1516	unsecapp.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exeWScript.execmd.exebrokerDhcpdriverref.exe

description	pid	Process	procid_target
PID 392 wrote to memory of 2264	392	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	83
PID 392 wrote to memory of 2264	392	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	83
PID 392 wrote to memory of 2264	392	308238649d710b938f9e0cf04bf52a0a3a89b253310035afdc0ba8e846732c61.exe	83
PID 2264 wrote to memory of 2072	2264	WScript.exe	93
PID 2264 wrote to memory of 2072	2264	WScript.exe	93
PID 2264 wrote to memory of 2072	2264	WScript.exe	93
PID 2072 wrote to memory of 1232	2072	cmd.exe	95
PID 2072 wrote to memory of 1232	2072	cmd.exe	95
PID 1232 wrote to memory of 1516	1232	brokerDhcpdriverref.exe	101
PID 1232 wrote to memory of 1516	1232	brokerDhcpdriverref.exe	101

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:392
- 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:2264
- - 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:2072
  - - 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
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1232
    - - C:\Documents and Settings\unsecapp.exe
        
        "C:\Documents and Settings\unsecapp.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1516

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\Microsoft.Management.Infrastructure.Native.Unmanaged\winlogon.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4992

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Documents and Settings\unsecapp.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1212

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\mskeyprotcli\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\upfc.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\wowreg32\dllhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2944

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:\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/1232-12-0x00007FFD56013000-0x00007FFD56015000-memory.dmp

Filesize
8KB

Download
memory/1232-13-0x00000000005B0000-0x00000000007C2000-memory.dmp

Filesize
2.1MB

Download
memory/1516-36-0x0000000001700000-0x000000000170E000-memory.dmp

Filesize
56KB

Download
memory/1516-37-0x00000000030E0000-0x0000000003136000-memory.dmp

Filesize
344KB

Download
memory/1516-38-0x0000000001710000-0x000000000171A000-memory.dmp

Filesize
40KB

Download
memory/1516-40-0x0000000003150000-0x000000000315C000-memory.dmp

Filesize
48KB

Download
memory/1516-39-0x0000000001720000-0x0000000001728000-memory.dmp

Filesize
32KB

Download
memory/1516-41-0x0000000003160000-0x0000000003168000-memory.dmp

Filesize
32KB

Download
memory/1516-42-0x0000000003130000-0x0000000003138000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads