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 24 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	1648	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4220	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2744	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3480	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	908	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	724	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4296	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2084	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3036	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3872	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3768	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4412	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2684	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4920	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4264	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4716	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	364	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	628	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1628	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4352	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1192	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4556	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4980	2992	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1500	2992	schtasks.exe	86

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000023c93-10.dat	dcrat
behavioral2/memory/3048-13-0x0000000000C20000-0x0000000000CF6000-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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	11DA048860021B6C22E171032E48B023.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	chainMonitor.exe

Executes dropped EXE 2 IoCs

pid	Process
3048	chainMonitor.exe
3836	System.exe

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Windows Sidebar\Gadgets\dllhost.exe	chainMonitor.exe
File created	C:\Program Files\Windows Sidebar\Gadgets\5940a34987c991	chainMonitor.exe
File created	C:\Program Files\Windows Sidebar\Gadgets\dllhost.exe	chainMonitor.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\sppsvc.exe	chainMonitor.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\0a1fd5f707cd16	chainMonitor.exe
File created	C:\Program Files (x86)\Google\Temp\TextInputHost.exe	chainMonitor.exe
File created	C:\Program Files (x86)\Google\Temp\22eafd247d37c3	chainMonitor.exe
File created	C:\Program Files (x86)\Google\Temp\upfc.exe	chainMonitor.exe
File created	C:\Program Files (x86)\Google\Temp\ea1d8f6d871115	chainMonitor.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\de-DE\spoolsv.exe	chainMonitor.exe
File created	C:\Windows\de-DE\f3b6ecef712a24	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-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	11DA048860021B6C22E171032E48B023.exe
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	chainMonitor.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 24 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4920	schtasks.exe
628	schtasks.exe
2744	schtasks.exe
4412	schtasks.exe
2084	schtasks.exe
908	schtasks.exe
724	schtasks.exe
3480	schtasks.exe
3036	schtasks.exe
3872	schtasks.exe
3768	schtasks.exe
4264	schtasks.exe
4716	schtasks.exe
1648	schtasks.exe
4220	schtasks.exe
4352	schtasks.exe
1192	schtasks.exe
364	schtasks.exe
1628	schtasks.exe
4556	schtasks.exe
4980	schtasks.exe
1500	schtasks.exe
4296	schtasks.exe
2684	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3048	chainMonitor.exe
3048	chainMonitor.exe
3048	chainMonitor.exe
3048	chainMonitor.exe
3048	chainMonitor.exe
3048	chainMonitor.exe
3048	chainMonitor.exe
3048	chainMonitor.exe
3836	System.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3048	chainMonitor.exe
Token: SeDebugPrivilege	3836	System.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1752 wrote to memory of 3752	1752	11DA048860021B6C22E171032E48B023.exe	82
PID 1752 wrote to memory of 3752	1752	11DA048860021B6C22E171032E48B023.exe	82
PID 1752 wrote to memory of 3752	1752	11DA048860021B6C22E171032E48B023.exe	82
PID 3752 wrote to memory of 2924	3752	WScript.exe	88
PID 3752 wrote to memory of 2924	3752	WScript.exe	88
PID 3752 wrote to memory of 2924	3752	WScript.exe	88
PID 2924 wrote to memory of 3048	2924	cmd.exe	90
PID 2924 wrote to memory of 3048	2924	cmd.exe	90
PID 3048 wrote to memory of 1864	3048	chainMonitor.exe	115
PID 3048 wrote to memory of 1864	3048	chainMonitor.exe	115
PID 1864 wrote to memory of 4364	1864	cmd.exe	118
PID 1864 wrote to memory of 4364	1864	cmd.exe	118
PID 1864 wrote to memory of 3836	1864	cmd.exe	120
PID 1864 wrote to memory of 3836	1864	cmd.exe	120

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:1752
- 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:3752
- - 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:2924
  - - C:\blockrefSessionBrokerDll\chainMonitor.exe
      "C:\blockrefSessionBrokerDll\chainMonitor.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3048
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\wnInqINynF.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1864
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4364
      - C:\Recovery\WindowsRE\System.exe
        
        "C:\Recovery\WindowsRE\System.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows Sidebar\Gadgets\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files\Windows Sidebar\Gadgets\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4220

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Program Files\Windows Sidebar\Gadgets\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\sppsvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3480

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:908

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:724

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TrustedInstallerT" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\TrustedInstaller.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TrustedInstaller" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\TrustedInstaller.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2084

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TrustedInstallerT" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\TrustedInstaller.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Google\Temp\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\Temp\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Google\Temp\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4412

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4920

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4264

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Google\Temp\upfc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\Temp\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:364

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Google\Temp\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:\Windows\de-DE\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\de-DE\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4352

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 12 /tr "'C:\Windows\de-DE\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1192

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\blockrefSessionBrokerDll\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\blockrefSessionBrokerDll\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 8 /tr "'C:\blockrefSessionBrokerDll\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1500

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\wnInqINynF.bat

Filesize
197B

MD5
102a7d8a169cd8dd56393d65238846d8

SHA1
53b9fd456826a711363e7e08c0a58dd04978ac32

SHA256
bd51718dca91a6bdd7e2b90a8f09eb7e474a855f88fe1c4ec002bb8f5f78ca79

SHA512
591ee38a0f813d06a72a694aee3880805c80721c9021a0032eddcb30876e2bca26f94c81e22a05529a87aeb668495776e9ef34d28db03c673e869e61b5fc4423

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/3048-12-0x00007FF9DAE43000-0x00007FF9DAE45000-memory.dmp

Filesize
8KB

Download
memory/3048-13-0x0000000000C20000-0x0000000000CF6000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads