dcrat | c0d51cad38cd578ac0f62737185d0e15184843b8a118bb978d11d9e86998eef3

General

Target

11DA048860021B6C22E171032E48B023.exe
Size

1.1MB
MD5

11da048860021b6c22e171032e48b023
SHA1

b3b636a8bd17223454b4522fdbdb4863e0c4a565
SHA256

c0d51cad38cd578ac0f62737185d0e15184843b8a118bb978d11d9e86998eef3
SHA512

09b8bc3f1fa034d28a14e0fc5e44722ee84cfd9b32dc7887674100d967b3c9232d7ae42156c8d45050ea781ba87a3ee29a54bfc04bef98c6e5f6d9123444509f
SSDEEP

24576:U2G/nvxW3Ww0tpI7rd5XFM2cxARnZ0S/J1:UbA30pILXZjv

Score

10^/10

dcrat discovery 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 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	2864	4816	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3340	4816	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3088	4816	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1964	4816	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4888	4816	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3412	4816	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3612	4816	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2368	4816	schtasks.exe	91
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4648	4816	schtasks.exe	91

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023c97-10.dat	dcrat
behavioral2/memory/764-13-0x0000000000DD0000-0x0000000000EA6000-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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	11DA048860021B6C22E171032E48B023.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	chainMonitor.exe

Executes dropped EXE 2 IoCs

pid	Process
764	chainMonitor.exe
732	TextInputHost.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files\Windows NT\Accessories\de-DE\lsass.exe	chainMonitor.exe
File opened for modification	C:\Program Files\Windows NT\Accessories\de-DE\lsass.exe	chainMonitor.exe
File created	C:\Program Files\Windows NT\Accessories\de-DE\6203df4a6bafc7	chainMonitor.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	11DA048860021B6C22E171032E48B023.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-1-5-21-1045960512-3948844814-3059691613-1000_Classes\Local Settings	11DA048860021B6C22E171032E48B023.exe
Key created	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000_Classes\Local Settings	chainMonitor.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
1964	schtasks.exe
4888	schtasks.exe
3412	schtasks.exe
2368	schtasks.exe
2864	schtasks.exe
3088	schtasks.exe
4648	schtasks.exe
3340	schtasks.exe
3612	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
764	chainMonitor.exe
732	TextInputHost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	764	chainMonitor.exe
Token: SeDebugPrivilege	732	TextInputHost.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4316 wrote to memory of 3516	4316	11DA048860021B6C22E171032E48B023.exe	85
PID 4316 wrote to memory of 3516	4316	11DA048860021B6C22E171032E48B023.exe	85
PID 4316 wrote to memory of 3516	4316	11DA048860021B6C22E171032E48B023.exe	85
PID 3516 wrote to memory of 2956	3516	WScript.exe	95
PID 3516 wrote to memory of 2956	3516	WScript.exe	95
PID 3516 wrote to memory of 2956	3516	WScript.exe	95
PID 2956 wrote to memory of 764	2956	cmd.exe	97
PID 2956 wrote to memory of 764	2956	cmd.exe	97
PID 764 wrote to memory of 4340	764	chainMonitor.exe	107
PID 764 wrote to memory of 4340	764	chainMonitor.exe	107
PID 4340 wrote to memory of 3068	4340	cmd.exe	109
PID 4340 wrote to memory of 3068	4340	cmd.exe	109
PID 4340 wrote to memory of 732	4340	cmd.exe	115
PID 4340 wrote to memory of 732	4340	cmd.exe	115

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\11DA048860021B6C22E171032E48B023.exe
"C:\Users\Admin\AppData\Local\Temp\11DA048860021B6C22E171032E48B023.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4316
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\blockrefSessionBrokerDll\5sVJrvWE.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3516
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\blockrefSessionBrokerDll\jNiINMcACfpGfudqTH4IxZpVWTbF.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2956
  - - C:\blockrefSessionBrokerDll\chainMonitor.exe
      "C:\blockrefSessionBrokerDll\chainMonitor.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:764
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\LB7RA5Sb5X.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4340
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:3068
      - C:\blockrefSessionBrokerDll\TextInputHost.exe
        
        "C:\blockrefSessionBrokerDll\TextInputHost.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:732

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 10 /tr "'C:\Program Files\Windows NT\Accessories\de-DE\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files\Windows NT\Accessories\de-DE\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3340

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 12 /tr "'C:\Program Files\Windows NT\Accessories\de-DE\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3088

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\blockrefSessionBrokerDll\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1964

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\blockrefSessionBrokerDll\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4888

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 6 /tr "'C:\blockrefSessionBrokerDll\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3412

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 11 /tr "'C:\blockrefSessionBrokerDll\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3612

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\blockrefSessionBrokerDll\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2368

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 6 /tr "'C:\blockrefSessionBrokerDll\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4648

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

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\LB7RA5Sb5X.bat

Filesize
210B

MD5
3194b87b6a61fddde09ea19a41e64d9c

SHA1
50839a9955ff80de3b6743735abcaff9703a6da1

SHA256
dc258b60b122f87258fa0fe4327ff81d69c0ca6b9f65acbf27209831b303834d

SHA512
101c522e21ead5e9c859ec2a4f1b0b4e721429d2af8d319e51abfffef12b3ef0802320290c9307752231d02a02211a27011a479a35f0c3a0ab69a58de0f18c64

Download Submit
C:\blockrefSessionBrokerDll\5sVJrvWE.vbe

Filesize
229B

MD5
7533c94864b144aa157dbd00f03e9871

SHA1
807bad6d8cb143e2fac7ec32a6e07a4016af308d

SHA256
1dceabad90f9b4e74e59d62eebbc86662708d2c28761074e8b4fd73aa73f60aa

SHA512
3d536e931dadb7d6efc079fc9ff336ee4f2c7a291fcd1df7139c565e74d73e4c12745b886dbb746f060cd46c36cb3d774bc2b9f3a5407a737cb94ac44ed70f8c

Download Submit
C:\blockrefSessionBrokerDll\chainMonitor.exe

Filesize
828KB

MD5
f6b809fa6bd0e72435fab78e9744ccd7

SHA1
52749158484cf20a6511fcd36fda0e8100ebe316

SHA256
af8a81f4387ba5ebe96f5111d56b65585c194602e5bd147997eab1b6e28ae7b2

SHA512
12c63edcd1f347b519da80c814fcf3640294fdbd2482a7be4da4d20f8f5d785d2e97f784df39ad28b317d2db3cc43d904c5584fc9eea2c1f1df01b999362adf9

Download Submit
C:\blockrefSessionBrokerDll\jNiINMcACfpGfudqTH4IxZpVWTbF.bat

Filesize
46B

MD5
6f0b3744c91bc8641c6cef0ae9be66b5

SHA1
5e45aef1422d839f27a9e73b395c58eeab7ae476

SHA256
6442de1cdf0bf9500de8b74c00506a7d84193b3780f9242f55497335526aad5c

SHA512
97089e966a4969391aa2fa10d0693c103a16eea70bfbc01481ecda46ae6953e3a25abf3034500e275cc60e0e8de6f95435b2ba2c9df2cda5bf58685af4cba8e0

Download Submit
memory/764-12-0x00007FFBA0133000-0x00007FFBA0135000-memory.dmp

Filesize
8KB

Download
memory/764-13-0x0000000000DD0000-0x0000000000EA6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads