dcrat | 224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0

General

Target

224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0.exe
Size

1.1MB
MD5

c1ea7d9d2b92b29bb016dc0c82ce0136
SHA1

0490c1a2a2ab084cb03bbb494454380eb0a4063f
SHA256

224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0
SHA512

51e7c868dd506de81112d18004f2dff73b0ef7a1b7614e94977c9e389919451a3c4bdda2668358999d490ca650a340305674d7c89212a33e8d111a8064a7a116
SSDEEP

24576:U2G/nvxW3Ww0tLh6X9jiDf3b8goWoMSCUH0N:UbA30cQoSP

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 21 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	3052	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2604	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2624	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2752	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2600	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2628	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2760	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2520	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2236	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2680	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2508	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2572	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2552	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2988	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1432	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1352	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2016	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	640	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1796	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	876	296	schtasks.exe	32
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1364	296	schtasks.exe	32

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000016c73-9.dat	dcrat
behavioral1/memory/2964-13-0x0000000000DE0000-0x0000000000EB6000-memory.dmp	dcrat
behavioral1/memory/1924-35-0x0000000001300000-0x00000000013D6000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

pid	Process
2964	hyperserversvc.exe
1924	services.exe

Loads dropped DLL 2 IoCs

pid	Process
2892	cmd.exe
2892	cmd.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Windows NT\TableTextService\hyperserversvc.exe	hyperserversvc.exe
File created	C:\Program Files\Windows NT\TableTextService\f62edfc467df86	hyperserversvc.exe
File created	C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\Desktop\services.exe	hyperserversvc.exe
File created	C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\Desktop\c5b4cb5e9653cc	hyperserversvc.exe
File created	C:\Program Files\Windows NT\TableTextService\hyperserversvc.exe	hyperserversvc.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\es-ES\csrss.exe	hyperserversvc.exe
File created	C:\Windows\es-ES\886983d96e3d3e	hyperserversvc.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	224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2508	schtasks.exe
2572	schtasks.exe
2552	schtasks.exe
1352	schtasks.exe
2016	schtasks.exe
640	schtasks.exe
1796	schtasks.exe
2752	schtasks.exe
876	schtasks.exe
2600	schtasks.exe
2236	schtasks.exe
2988	schtasks.exe
1432	schtasks.exe
2624	schtasks.exe
2604	schtasks.exe
2520	schtasks.exe
2680	schtasks.exe
3052	schtasks.exe
2760	schtasks.exe
1364	schtasks.exe
2628	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2964	hyperserversvc.exe
2964	hyperserversvc.exe
2964	hyperserversvc.exe
2964	hyperserversvc.exe
2964	hyperserversvc.exe
1924	services.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2964	hyperserversvc.exe
Token: SeDebugPrivilege	1924	services.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1032 wrote to memory of 2052	1032	224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0.exe	28
PID 1032 wrote to memory of 2052	1032	224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0.exe	28
PID 1032 wrote to memory of 2052	1032	224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0.exe	28
PID 1032 wrote to memory of 2052	1032	224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0.exe	28
PID 2052 wrote to memory of 2892	2052	WScript.exe	29
PID 2052 wrote to memory of 2892	2052	WScript.exe	29
PID 2052 wrote to memory of 2892	2052	WScript.exe	29
PID 2052 wrote to memory of 2892	2052	WScript.exe	29
PID 2892 wrote to memory of 2964	2892	cmd.exe	31
PID 2892 wrote to memory of 2964	2892	cmd.exe	31
PID 2892 wrote to memory of 2964	2892	cmd.exe	31
PID 2892 wrote to memory of 2964	2892	cmd.exe	31
PID 2964 wrote to memory of 2468	2964	hyperserversvc.exe	54
PID 2964 wrote to memory of 2468	2964	hyperserversvc.exe	54
PID 2964 wrote to memory of 2468	2964	hyperserversvc.exe	54
PID 2468 wrote to memory of 1956	2468	cmd.exe	56
PID 2468 wrote to memory of 1956	2468	cmd.exe	56
PID 2468 wrote to memory of 1956	2468	cmd.exe	56
PID 2468 wrote to memory of 1924	2468	cmd.exe	57
PID 2468 wrote to memory of 1924	2468	cmd.exe	57
PID 2468 wrote to memory of 1924	2468	cmd.exe	57

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\224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0.exe
"C:\Users\Admin\AppData\Local\Temp\224c3666515e1602d6a4c8f6802d8ad2c597951e50cf4938e5ddc849702f1bd0.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1032
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\crtnet\U4fZxuOVYXKrCZIgxMyzABwsANpU.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2052
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\crtnet\Bnw1HgIbKGac.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2892
  - - C:\crtnet\hyperserversvc.exe
      "C:\crtnet\hyperserversvc.exe"
      4⤵
      Executes dropped EXE
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2964
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\dKxHHIEmKS.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:2468
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:1956
      - C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\services.exe
        
        "C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\services.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "hyperserversvch" /sc MINUTE /mo 14 /tr "'C:\Program Files\Windows NT\TableTextService\hyperserversvc.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3052

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "hyperserversvc" /sc ONLOGON /tr "'C:\Program Files\Windows NT\TableTextService\hyperserversvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "hyperserversvch" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows NT\TableTextService\hyperserversvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 6 /tr "'C:\MSOCache\All Users\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\MSOCache\All Users\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2600

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\MSOCache\All Users\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 5 /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2760

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2520

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 5 /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2236

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 11 /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2680

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 7 /tr "'C:\Recovery\1f5748e2-69f6-11ef-b486-62cb582c238c\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Windows\es-ES\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\es-ES\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2988

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Windows\es-ES\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1432

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1352

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-0115-0409-0000-0000000FF1CE}-C\1033\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:640

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\Desktop\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\Desktop\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:876

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft SQL Server Compact Edition\v3.5\Desktop\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1364

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

1

T1012

System Information Discovery

1

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\dKxHHIEmKS.bat

Filesize
226B

MD5
e09ac893ceddea06872722746c81ab8b

SHA1
afe669a1c92e908180dbcfe0040bf06e1dc06285

SHA256
20ea743b585fd1d9bfc40a73279faae147db09c17b2ae0af5a085a53a35f54b3

SHA512
7f1e39deb8f3be3fb9a8ff1f5b5e0cca59b7df493a2e8b282fb3f901003aac4ea95e404b29b6ccd2314bf42a93e0524048282a87df170b427f623d2cab7e2374

Download Submit
C:\crtnet\Bnw1HgIbKGac.bat

Filesize
30B

MD5
ad864158aece2c49b735cb6ddb40c692

SHA1
42cff4692d777de8a6e5dc42a48b95a00a4f74d0

SHA256
d788ee93f4876edfdcc51052ee21680b067fee9071f2efa752608fe39af39c84

SHA512
df2ce6df2fc21d23d91f869729c1bb5fbde0079d015d1b44a2679861a30a18b373bcdffe6f399964577a2b8f566d5373958c82e0917aa838b2e3f5705dc8e034

Download Submit
C:\crtnet\U4fZxuOVYXKrCZIgxMyzABwsANpU.vbe

Filesize
195B

MD5
d1e9f1bc4219b36665be0abca3f62ad2

SHA1
9ebf784c32f63049b3e39681015ee78350e04ee2

SHA256
8736f9684770146460caaf01b7cc432b2dcf9faf5d398b27f9f58cd86d87e978

SHA512
aeda85a9a5548a6eb44eb92c9839aa98e3e9932d9d0deb6a4fa9ec603438c85b38c1ab295cd10035b54e65453dd19da685457c82241caa369551df0ec75b2787

Download Submit
\crtnet\hyperserversvc.exe

Filesize
828KB

MD5
915963963f2bfe83c2f1a3a50cf042ca

SHA1
5b7ccdc34d46ff3d25752ae9f73ae6649e9ef791

SHA256
28c32ebbf807cd3ed0a35ead7bef99665da102a85bdfe0f91cf7f92d167dfd40

SHA512
7509a3ba3258848851c5315eecb1105ec10018c1012c244531a6250bcab84196378bd1fa9374c92ee3fa66f96433ddd17929875f37d2b272a97389abb6aa39b4

Download Submit
memory/1924-35-0x0000000001300000-0x00000000013D6000-memory.dmp

Filesize
856KB

Download
memory/2964-13-0x0000000000DE0000-0x0000000000EB6000-memory.dmp

Filesize
856KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads