dcrat | d169e5e99edef6f5c3619faee33bddd20978f514bdc3448b8655fd06ea5f5984

General

Target

183CB9283D9C8F6282283BD39F49D33C.exe
Size

2.7MB
MD5

183cb9283d9c8f6282283bd39f49d33c
SHA1

76674564064d31bb9d37f802bdec3821d4a55d89
SHA256

d169e5e99edef6f5c3619faee33bddd20978f514bdc3448b8655fd06ea5f5984
SHA512

14a40235310755e00bfa58a5169978b7fe40890e2f1149500f77780b82ef1aed1354daafb149de18deb3690bbc1b4f6e885be988e4163b6e3acdd16c30d28e22
SSDEEP

49152:Bfj5Pkja3lMPnl9LS7y5PEeQxtD5vLyCse5EPUC1SKGLFSjvzbN+/rV:BfBkyqPnDSOdEeQfocN8GLQLkz

Score

10^/10

dcrat evasion infostealer rat trojan

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	556	4756	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1816	4756	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1440	4756	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2608	4756	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	720	4756	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2244	4756	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	388	4756	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	812	4756	schtasks.exe	85
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3644	4756	schtasks.exe	85

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	183CB9283D9C8F6282283BD39F49D33C.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	183CB9283D9C8F6282283BD39F49D33C.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	183CB9283D9C8F6282283BD39F49D33C.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	RuntimeBroker.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/1996-1-0x0000000000D30000-0x0000000000FE4000-memory.dmp	dcrat
behavioral2/files/0x0008000000023ccd-33.dat	dcrat
behavioral2/files/0x000a000000023cbf-64.dat	dcrat
behavioral2/memory/3624-78-0x0000000000290000-0x0000000000544000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 1 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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	183CB9283D9C8F6282283BD39F49D33C.exe

Executes dropped EXE 1 IoCs

pid	Process
3624	RuntimeBroker.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RuntimeBroker.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	183CB9283D9C8F6282283BD39F49D33C.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	183CB9283D9C8F6282283BD39F49D33C.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	RuntimeBroker.exe

Drops file in Windows directory 10 IoCs

description	ioc	Process
File created	C:\Windows\assembly\GAC_64\srmlib\1.0.0.0__31bf3856ad364e35\dllhost.exe	183CB9283D9C8F6282283BD39F49D33C.exe
File created	C:\Windows\assembly\GAC_64\srmlib\1.0.0.0__31bf3856ad364e35\5940a34987c991	183CB9283D9C8F6282283BD39F49D33C.exe
File created	C:\Windows\Help\Help\9e8d7a4ca61bd9	183CB9283D9C8F6282283BD39F49D33C.exe
File opened for modification	C:\Windows\assembly\GAC_64\srmlib\1.0.0.0__31bf3856ad364e35\RCX8C92.tmp	183CB9283D9C8F6282283BD39F49D33C.exe
File opened for modification	C:\Windows\assembly\GAC_64\srmlib\1.0.0.0__31bf3856ad364e35\dllhost.exe	183CB9283D9C8F6282283BD39F49D33C.exe
File created	C:\Windows\Help\Help\RuntimeBroker.exe	183CB9283D9C8F6282283BD39F49D33C.exe
File opened for modification	C:\Windows\assembly\GAC_64\srmlib\1.0.0.0__31bf3856ad364e35\RCX8CC2.tmp	183CB9283D9C8F6282283BD39F49D33C.exe
File opened for modification	C:\Windows\Help\Help\RCX91D6.tmp	183CB9283D9C8F6282283BD39F49D33C.exe
File opened for modification	C:\Windows\Help\Help\RCX9254.tmp	183CB9283D9C8F6282283BD39F49D33C.exe
File opened for modification	C:\Windows\Help\Help\RuntimeBroker.exe	183CB9283D9C8F6282283BD39F49D33C.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	183CB9283D9C8F6282283BD39F49D33C.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
1816	schtasks.exe
1440	schtasks.exe
3644	schtasks.exe
812	schtasks.exe
556	schtasks.exe
2608	schtasks.exe
720	schtasks.exe
2244	schtasks.exe
388	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1996	183CB9283D9C8F6282283BD39F49D33C.exe
3624	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1996	183CB9283D9C8F6282283BD39F49D33C.exe
Token: SeDebugPrivilege	3624	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1996 wrote to memory of 4896	1996	183CB9283D9C8F6282283BD39F49D33C.exe	95
PID 1996 wrote to memory of 4896	1996	183CB9283D9C8F6282283BD39F49D33C.exe	95
PID 4896 wrote to memory of 4328	4896	cmd.exe	97
PID 4896 wrote to memory of 4328	4896	cmd.exe	97
PID 4896 wrote to memory of 3624	4896	cmd.exe	104
PID 4896 wrote to memory of 3624	4896	cmd.exe	104

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	183CB9283D9C8F6282283BD39F49D33C.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	183CB9283D9C8F6282283BD39F49D33C.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	183CB9283D9C8F6282283BD39F49D33C.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	RuntimeBroker.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	RuntimeBroker.exe

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\183CB9283D9C8F6282283BD39F49D33C.exe
"C:\Users\Admin\AppData\Local\Temp\183CB9283D9C8F6282283BD39F49D33C.exe"
1⤵
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1996
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\YD2Vui68H4.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4896
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:4328
- - C:\Windows\Help\Help\RuntimeBroker.exe
    "C:\Windows\Help\Help\RuntimeBroker.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:3624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 6 /tr "'C:\Windows\assembly\GAC_64\srmlib\1.0.0.0__31bf3856ad364e35\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\assembly\GAC_64\srmlib\1.0.0.0__31bf3856ad364e35\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 12 /tr "'C:\Windows\assembly\GAC_64\srmlib\1.0.0.0__31bf3856ad364e35\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2244

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Windows\Help\Help\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:388

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\Help\Help\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Windows\Help\Help\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3644

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

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

1

T1548

Bypass User Account Control

1

T1548.002

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\RCX8A6E.tmp

Filesize
2.7MB

MD5
183cb9283d9c8f6282283bd39f49d33c

SHA1
76674564064d31bb9d37f802bdec3821d4a55d89

SHA256
d169e5e99edef6f5c3619faee33bddd20978f514bdc3448b8655fd06ea5f5984

SHA512
14a40235310755e00bfa58a5169978b7fe40890e2f1149500f77780b82ef1aed1354daafb149de18deb3690bbc1b4f6e885be988e4163b6e3acdd16c30d28e22

Download Submit
C:\Users\Admin\AppData\Local\Temp\YD2Vui68H4.bat

Filesize
203B

MD5
7c4e6545e346c41729023ad9478f651a

SHA1
71f8cd77e8a68b78775f2f8e58902806c12450ea

SHA256
d19ee38f67b5caa24e58dfd99b61103a42ac9cd42a9309bcc2d04555082ddf62

SHA512
0e9d34072d829554a2a7f5d3fc3c4ede192d65148c65410d5272b6450e311268a6bb40a31ba77b7d972229874d0d2f82bca9f4d43a48bd54895f844e590e1099

Download Submit
C:\Windows\Help\Help\RuntimeBroker.exe

Filesize
2.7MB

MD5
564f42c24b4985aae0cf1af5e49930f1

SHA1
919c02f696b0e1e1b8f7337b38940d7e38eb8f84

SHA256
9e3763bad084ba47e870f7d18ad0acf1c183adf204f9e3393b39490ca14cceea

SHA512
f3f7bcc7c187c60547c109020c1e45207a6e2f175d050ba5934f312e1e48b325f05edcc40c41ebab76add59ee22b4bd9f2f9af8d9af4c3ea7922c9d37e63be4c

Download Submit
memory/1996-14-0x000000001BB80000-0x000000001BB92000-memory.dmp

Filesize
72KB

Download
memory/1996-17-0x000000001BC30000-0x000000001BC38000-memory.dmp

Filesize
32KB

Download
memory/1996-5-0x000000001BB90000-0x000000001BBE0000-memory.dmp

Filesize
320KB

Download
memory/1996-6-0x0000000003340000-0x0000000003348000-memory.dmp

Filesize
32KB

Download
memory/1996-7-0x0000000003350000-0x0000000003360000-memory.dmp

Filesize
64KB

Download
memory/1996-8-0x000000001BB40000-0x000000001BB56000-memory.dmp

Filesize
88KB

Download
memory/1996-9-0x0000000003360000-0x0000000003368000-memory.dmp

Filesize
32KB

Download
memory/1996-10-0x000000001BB70000-0x000000001BB78000-memory.dmp

Filesize
32KB

Download
memory/1996-11-0x000000001BBE0000-0x000000001BBEA000-memory.dmp

Filesize
40KB

Download
memory/1996-12-0x000000001C350000-0x000000001C3A6000-memory.dmp

Filesize
344KB

Download
memory/1996-13-0x000000001BB60000-0x000000001BB68000-memory.dmp

Filesize
32KB

Download
memory/1996-0-0x00007FFC0F4F3000-0x00007FFC0F4F5000-memory.dmp

Filesize
8KB

Download
memory/1996-16-0x000000001BC20000-0x000000001BC28000-memory.dmp

Filesize
32KB

Download
memory/1996-4-0x0000000003320000-0x000000000333C000-memory.dmp

Filesize
112KB

Download
memory/1996-21-0x000000001C3D0000-0x000000001C3DA000-memory.dmp

Filesize
40KB

Download
memory/1996-20-0x000000001C3C0000-0x000000001C3CC000-memory.dmp

Filesize
48KB

Download
memory/1996-19-0x000000001C3B0000-0x000000001C3BE000-memory.dmp

Filesize
56KB

Download
memory/1996-18-0x000000001C3A0000-0x000000001C3AC000-memory.dmp

Filesize
48KB

Download
memory/1996-15-0x000000001C8D0000-0x000000001CDF8000-memory.dmp

Filesize
5.2MB

Download
memory/1996-22-0x000000001C3E0000-0x000000001C3EC000-memory.dmp

Filesize
48KB

Download
memory/1996-3-0x0000000003310000-0x000000000331E000-memory.dmp

Filesize
56KB

Download
memory/1996-2-0x00007FFC0F4F0000-0x00007FFC0FFB1000-memory.dmp

Filesize
10.8MB

Download
memory/1996-73-0x00007FFC0F4F0000-0x00007FFC0FFB1000-memory.dmp

Filesize
10.8MB

Download
memory/1996-1-0x0000000000D30000-0x0000000000FE4000-memory.dmp

Filesize
2.7MB

Download
memory/3624-78-0x0000000000290000-0x0000000000544000-memory.dmp

Filesize
2.7MB

Download
memory/3624-79-0x000000001CD60000-0x000000001CD72000-memory.dmp

Filesize
72KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads