dcrat | ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0

General

Target

ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Size

1.1MB
MD5

119ede06afc1b721278e8955fe8338f4
SHA1

3917c6cfd13689a83e8410c157f54c0e05550bcf
SHA256

ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0
SHA512

72193ded81941ecef91da566d47e22667e98d927a18cbe06be3e4cbea6c1504664a7569fd9531ddbf1b4b019a953e53deb8da34938d1b879b4d74902eff3be78
SSDEEP

24576:AMYPCI+q+U4cIG409ozWucypk1Nd4AX+iB/YjuM6kyh+:ABPZ0Kr1FXHB/guM6k+

Score

10^/10

dcrat infostealer persistence rat

Malware Config

Signatures

DcRat 9 IoCs

DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

rat infostealer dcrat

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	process
2836	schtasks.exe
2792	schtasks.exe
2796	schtasks.exe
2932	schtasks.exe
2772	schtasks.exe
2924	schtasks.exe
2832	schtasks.exe
2936	schtasks.exe
2764	schtasks.exe

Dcrat family
dcrat

Modifies WinLogon for persistence 2 TTPs 3 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\dwm.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\dwm.exe\", \"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\wininit.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\dwm.exe\", \"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\wininit.exe\", \"C:\\Users\\All Users\\Desktop\\OSPPSVC.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe

Process spawned unexpected child process 9 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	process
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2772	2552	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2836	2552	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2936	2552	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2764	2552	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2792	2552	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2924	2552	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2832	2552	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2796	2552	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2932	2552	schtasks.exe

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/memory/2328-1-0x0000000000890000-0x00000000009BE000-memory.dmp	dcrat
C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\dwm.exe	dcrat
behavioral1/memory/2700-22-0x0000000000810000-0x000000000093E000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

dwm.exe

pid process

2700 dwm.exe

pid	process
2700	dwm.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\dwm.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\dwm.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\wininit.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Recovery\\f6a14ac2-8725-11ef-a9ab-dab21757c799\\wininit.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2039016743-699959520-214465309-1000\Software\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Users\\All Users\\Desktop\\OSPPSVC.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Users\\All Users\\Desktop\\OSPPSVC.exe\""	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe

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

System Information Discovery
T1082

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

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	process
2772	schtasks.exe
2796	schtasks.exe
2932	schtasks.exe
2924	schtasks.exe
2832	schtasks.exe
2836	schtasks.exe
2936	schtasks.exe
2764	schtasks.exe
2792	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exedwm.exe

pid process

2328 ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
2700 dwm.exe

pid	process
2328	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
2700	dwm.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exedwm.exe

description	pid	process
Token: SeDebugPrivilege	2328	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
Token: SeDebugPrivilege	2700	dwm.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.execmd.exe

description	pid	process	target process
PID 2328 wrote to memory of 2708	2328	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe	cmd.exe
PID 2328 wrote to memory of 2708	2328	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe	cmd.exe
PID 2328 wrote to memory of 2708	2328	ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe	cmd.exe
PID 2708 wrote to memory of 2204	2708	cmd.exe	w32tm.exe
PID 2708 wrote to memory of 2204	2708	cmd.exe	w32tm.exe
PID 2708 wrote to memory of 2204	2708	cmd.exe	w32tm.exe
PID 2708 wrote to memory of 2700	2708	cmd.exe	dwm.exe
PID 2708 wrote to memory of 2700	2708	cmd.exe	dwm.exe
PID 2708 wrote to memory of 2700	2708	cmd.exe	dwm.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\ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe
"C:\Users\Admin\AppData\Local\Temp\ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2328
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\c5ZP5GVEbN.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2708
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2204
- - C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\dwm.exe
    "C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\dwm.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2700

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 6 /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\dwm.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 14 /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\wininit.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2764

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 8 /tr "'C:\Users\All Users\Desktop\OSPPSVC.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2832

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Users\All Users\Desktop\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVCO" /sc MINUTE /mo 8 /tr "'C:\Users\All Users\Desktop\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Recovery\f6a14ac2-8725-11ef-a9ab-dab21757c799\dwm.exe

Filesize
1.1MB

MD5
119ede06afc1b721278e8955fe8338f4

SHA1
3917c6cfd13689a83e8410c157f54c0e05550bcf

SHA256
ad4072aa43c0fcac0cc0c5f86147c93fb16707a547d7760407a02be06bf9d8f0

SHA512
72193ded81941ecef91da566d47e22667e98d927a18cbe06be3e4cbea6c1504664a7569fd9531ddbf1b4b019a953e53deb8da34938d1b879b4d74902eff3be78

Download Submit
C:\Users\Admin\AppData\Local\Temp\c5ZP5GVEbN.bat

Filesize
221B

MD5
36a2236a2cdf9027859d23df99a33a12

SHA1
f31a4ebe0cc38a4d94c47ba0df350292d75bac49

SHA256
ea5dadba54d14a2e7d42fbf3d6d3d64d6dee50e509d52b68463b557957b4a52e

SHA512
f85de4cab33c12ab7b3469ca04a14cd553be0ef353288e86a3e6d3531faac3720b47347f741f84ea86a6f7ee4d77ab101f442666bb80beb61a5aee526a112ca0

Download Submit
memory/2328-0-0x000007FEF6083000-0x000007FEF6084000-memory.dmp

Filesize
4KB

Download
memory/2328-1-0x0000000000890000-0x00000000009BE000-memory.dmp

Filesize
1.2MB

Download
memory/2328-2-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2328-3-0x00000000003C0000-0x00000000003DC000-memory.dmp

Filesize
112KB

Download
memory/2328-4-0x00000000003F0000-0x0000000000402000-memory.dmp

Filesize
72KB

Download
memory/2328-5-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2328-6-0x00000000006A0000-0x00000000006A8000-memory.dmp

Filesize
32KB

Download
memory/2328-19-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2700-22-0x0000000000810000-0x000000000093E000-memory.dmp

Filesize
1.2MB

Download
memory/2700-23-0x00000000003C0000-0x00000000003D2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads