dcrat | a96f478eaccaa6f24f94f782f2e65717ce87a2ed8c6e43bdb48dd9f4d83a5f75

General

Target

DCRatBuild.exe
Size

1.1MB
MD5

7a9b75201612cbddbd7306ad838b7702
SHA1

3e933e2963ea93327b484a7fb35edeb8e70b5825
SHA256

a96f478eaccaa6f24f94f782f2e65717ce87a2ed8c6e43bdb48dd9f4d83a5f75
SHA512

2de8b99ff6223c0fe5802aa46a2c8f004ae2d3cf614663861857f360eb78fb93903e5210f8022358416495f18b28b9fe3c2b99c5386b170f36f92c16f818c17a
SSDEEP

24576:U2G/nvxW3Ww0tJjFQ+qTLRr61LjemLSAN0+KleGpi:UbA30RwRXo/NolG

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	5008	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4820	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5092	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5456	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4416	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5988	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1332	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5548	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1760	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5424	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4528	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4880	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2604	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	808	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5868	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	376	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2676	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2380	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5732	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1476	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	6080	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1620	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1232	4784	schtasks.exe	93
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	456	4784	schtasks.exe	93

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x0007000000024242-10.dat	dcrat
behavioral2/memory/4840-13-0x0000000000690000-0x0000000000766000-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-1-5-21-814918696-1585701690-3140955116-1000\Control Panel\International\Geo\Nation	DCRatBuild.exe
Key value queried	\REGISTRY\USER\S-1-5-21-814918696-1585701690-3140955116-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-814918696-1585701690-3140955116-1000\Control Panel\International\Geo\Nation	componentwebsession.exe

Executes dropped EXE 2 IoCs

pid	Process
4840	componentwebsession.exe
5012	RuntimeBroker.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Internet Explorer\RuntimeBroker.exe	componentwebsession.exe
File created	C:\Program Files\Internet Explorer\9e8d7a4ca61bd9	componentwebsession.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\bcastdvr\WaaSMedicAgent.exe	componentwebsession.exe
File opened for modification	C:\Windows\bcastdvr\WaaSMedicAgent.exe	componentwebsession.exe
File created	C:\Windows\bcastdvr\c82b8037eab33d	componentwebsession.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	DCRatBuild.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-1-5-21-814918696-1585701690-3140955116-1000_Classes\Local Settings	DCRatBuild.exe
Key created	\REGISTRY\USER\S-1-5-21-814918696-1585701690-3140955116-1000_Classes\Local Settings	componentwebsession.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
808	schtasks.exe
5868	schtasks.exe
2676	schtasks.exe
1476	schtasks.exe
6080	schtasks.exe
456	schtasks.exe
1232	schtasks.exe
5092	schtasks.exe
5456	schtasks.exe
5988	schtasks.exe
5424	schtasks.exe
4528	schtasks.exe
4880	schtasks.exe
2604	schtasks.exe
376	schtasks.exe
5008	schtasks.exe
4820	schtasks.exe
4416	schtasks.exe
1332	schtasks.exe
2380	schtasks.exe
5732	schtasks.exe
1620	schtasks.exe
5548	schtasks.exe
1760	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
4840	componentwebsession.exe
4840	componentwebsession.exe
4840	componentwebsession.exe
5012	RuntimeBroker.exe
5012	RuntimeBroker.exe
5012	RuntimeBroker.exe
5012	RuntimeBroker.exe
5012	RuntimeBroker.exe
5012	RuntimeBroker.exe
5012	RuntimeBroker.exe
5012	RuntimeBroker.exe
5012	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4840	componentwebsession.exe
Token: SeDebugPrivilege	5012	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3800 wrote to memory of 5272	3800	DCRatBuild.exe	89
PID 3800 wrote to memory of 5272	3800	DCRatBuild.exe	89
PID 3800 wrote to memory of 5272	3800	DCRatBuild.exe	89
PID 5272 wrote to memory of 620	5272	WScript.exe	96
PID 5272 wrote to memory of 620	5272	WScript.exe	96
PID 5272 wrote to memory of 620	5272	WScript.exe	96
PID 620 wrote to memory of 4840	620	cmd.exe	98
PID 620 wrote to memory of 4840	620	cmd.exe	98
PID 4840 wrote to memory of 3836	4840	componentwebsession.exe	123
PID 4840 wrote to memory of 3836	4840	componentwebsession.exe	123
PID 3836 wrote to memory of 4180	3836	cmd.exe	125
PID 3836 wrote to memory of 4180	3836	cmd.exe	125
PID 3836 wrote to memory of 5012	3836	cmd.exe	127
PID 3836 wrote to memory of 5012	3836	cmd.exe	127

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\DCRatBuild.exe
"C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3800
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Bridgemsblockcomponentperf\NlYVQ5qrJ.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5272
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Bridgemsblockcomponentperf\2hJ7Mn5f5Z5JkVq57.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:620
  - - C:\Bridgemsblockcomponentperf\componentwebsession.exe
      "C:\Bridgemsblockcomponentperf\componentwebsession.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:4840
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\J4WjepjhOD.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3836
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4180
      - C:\aff403968f1bfcc42131676322798b50\RuntimeBroker.exe
        
        "C:\aff403968f1bfcc42131676322798b50\RuntimeBroker.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:5012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WaaSMedicAgentW" /sc MINUTE /mo 11 /tr "'C:\Windows\bcastdvr\WaaSMedicAgent.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5008

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WaaSMedicAgent" /sc ONLOGON /tr "'C:\Windows\bcastdvr\WaaSMedicAgent.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4820

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WaaSMedicAgentW" /sc MINUTE /mo 6 /tr "'C:\Windows\bcastdvr\WaaSMedicAgent.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5092

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Bridgemsblockcomponentperf\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Bridgemsblockcomponentperf\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Bridgemsblockcomponentperf\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5988

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\aff403968f1bfcc42131676322798b50\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\aff403968f1bfcc42131676322798b50\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\aff403968f1bfcc42131676322798b50\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 10 /tr "'C:\Bridgemsblockcomponentperf\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5424

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Bridgemsblockcomponentperf\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4528

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 5 /tr "'C:\Bridgemsblockcomponentperf\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Program Files\Internet Explorer\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Internet Explorer\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:808

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Program Files\Internet Explorer\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5868

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WaaSMedicAgentW" /sc MINUTE /mo 12 /tr "'C:\aff403968f1bfcc42131676322798b50\WaaSMedicAgent.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:376

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WaaSMedicAgent" /sc ONLOGON /tr "'C:\aff403968f1bfcc42131676322798b50\WaaSMedicAgent.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2676

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WaaSMedicAgentW" /sc MINUTE /mo 9 /tr "'C:\aff403968f1bfcc42131676322798b50\WaaSMedicAgent.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2380

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 11 /tr "'C:\Bridgemsblockcomponentperf\upfc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5732

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Bridgemsblockcomponentperf\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 7 /tr "'C:\Bridgemsblockcomponentperf\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:6080

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 14 /tr "'C:\f9532e701a889cdd91b8\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1620

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\f9532e701a889cdd91b8\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1232

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 5 /tr "'C:\f9532e701a889cdd91b8\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:456

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:\Bridgemsblockcomponentperf\2hJ7Mn5f5Z5JkVq57.bat

Filesize
55B

MD5
8f7257c5f547039c68750c858b05a0ce

SHA1
1c222f1fa6a871cdb8d8bf90ab5d2f8f0b64e0ee

SHA256
2d925c9f62648aaf46b91efb3e63e6eb49dbcdbebf85acd9886ce71d001cb504

SHA512
eaaf6cd27c1d10afdcefafaa4f488ff0121a966ceb67821fcffac777a27b394a431dac44f953dc868bf8db42e420e8e37ca05717ce65cb711085059dded718af

Download Submit
C:\Bridgemsblockcomponentperf\NlYVQ5qrJ.vbe

Filesize
221B

MD5
372a1fd5b0a18b5d2c8433868b80409f

SHA1
9460aeae733aca6a42a1b45ad5684cab9cbddef5

SHA256
e511fb9d01a3955c024250db45725d631ced31d74b96525c11dc46ac79613fa7

SHA512
910646531fcb860b91ea656c73a66981eb3c1f10d20e5dbb0fbd4ede6541abae11bd3a18daee519b53cd370f94d0262f51ddca642e6e1af5e7955b824611e278

Download Submit
C:\Bridgemsblockcomponentperf\componentwebsession.exe

Filesize
829KB

MD5
9ec0d74bdb80b5c29ff2d930c22ba856

SHA1
f58ca771c957db21e5fd41c4ea2d0563e3b876c8

SHA256
c5750aada53c6a8c0f2214e463e960ac582c2c27a5b4e33bf52fee513b39607c

SHA512
1a43ef0e869c7657ae2236164ad09c64a05b1cf94ef44addddcd94015c455ee263f1bf1c3ec24fe44b99d6c8c8f9b746d13b3fe510364670f7c3edf7299367b4

Download Submit
C:\Users\Admin\AppData\Local\Temp\J4WjepjhOD.bat

Filesize
218B

MD5
1a49465e7a44d7c5e5805a46e4b9a053

SHA1
3c811d06cc90730dbeab2ec71801b06f59dcd3eb

SHA256
628e6afec718c71a7177d6e62cfb7092edbb7be638adf17ca404ffa41ae950aa

SHA512
95a905ce8ad76dcad8bfdb52f232893be34402bb520c4dfe4c41ae9bfcc7a43a82cff7f0cab345c2be9984eac438057dc4f7c8f69e8c52286693d9e8d8daea00

Download Submit
memory/4840-12-0x00007FF98B623000-0x00007FF98B625000-memory.dmp

Filesize
8KB

Download
memory/4840-13-0x0000000000690000-0x0000000000766000-memory.dmp

Filesize
856KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads