dcrat | 390d7472201e8ea9bdc6c7fa2b4ab1f6faca02071f1f997037cc5f52759a9cb6

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat
Suspicious use of NtCreateProcessExOtherParentProcess 1 IoCs

Processes:

WerFault.exe

description pid process target process

PID 1876 created 3668 1876 WerFault.exe svchost.exe
Executes dropped EXE 2 IoCs

Processes:

wincommon.exesvchost.exe

pid process

1736 wincommon.exe
3668 svchost.exe

description	pid	process	target process
PID 1876 created 3668	1876	WerFault.exe	svchost.exe

Drops file in Program Files directory 2 IoCs

Processes:

wincommon.exe

description	ioc	process
File created	C:\Program Files\Common Files\DESIGNER\svchost.exe	wincommon.exe
File created	C:\Program Files\Common Files\DESIGNER\f4d236fdec2fd03914189c3b26e5cb0dfea9d761	wincommon.exe

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

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1876 3668 WerFault.exe svchost.exe
Creates scheduled task(s) 1 TTPs 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

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

pid process

3804 schtasks.exe
3656 schtasks.exe
3940 schtasks.exe
3340 schtasks.exe
492 schtasks.exe
1424 schtasks.exe
Modifies registry class 1 IoCs

Processes:

ForceOp 2.8.7 - By RaiSence.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings ForceOp 2.8.7 - By RaiSence.exe

pid	pid_target	process	target process
1876	3668	WerFault.exe	svchost.exe

pid	process
3804	schtasks.exe
3656	schtasks.exe
3940	schtasks.exe
3340	schtasks.exe
492	schtasks.exe
1424	schtasks.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000_Classes\Local Settings	ForceOp 2.8.7 - By RaiSence.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

Processes:

wincommon.exesvchost.exeWerFault.exe

pid	process
1736	wincommon.exe
3668	svchost.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe
1876	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

wincommon.exesvchost.exeWerFault.exe

description pid process

Token: SeDebugPrivilege 1736 wincommon.exe
Token: SeDebugPrivilege 3668 svchost.exe
Token: SeDebugPrivilege 1876 WerFault.exe

description	pid	process
Token: SeDebugPrivilege	1736	wincommon.exe
Token: SeDebugPrivilege	3668	svchost.exe
Token: SeDebugPrivilege	1876	WerFault.exe

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

ForceOp 2.8.7 - By RaiSence.exeWScript.execmd.exewincommon.exe

description	pid	process	target process
PID 1196 wrote to memory of 3120	1196	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 1196 wrote to memory of 3120	1196	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 1196 wrote to memory of 3120	1196	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 1196 wrote to memory of 3192	1196	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 1196 wrote to memory of 3192	1196	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 1196 wrote to memory of 3192	1196	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 3120 wrote to memory of 1364	3120	WScript.exe	cmd.exe
PID 3120 wrote to memory of 1364	3120	WScript.exe	cmd.exe
PID 3120 wrote to memory of 1364	3120	WScript.exe	cmd.exe
PID 1364 wrote to memory of 1736	1364	cmd.exe	wincommon.exe
PID 1364 wrote to memory of 1736	1364	cmd.exe	wincommon.exe
PID 1736 wrote to memory of 3656	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 3656	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 3940	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 3940	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 3340	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 3340	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 492	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 492	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 1424	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 1424	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 3804	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 3804	1736	wincommon.exe	schtasks.exe
PID 1736 wrote to memory of 3668	1736	wincommon.exe	svchost.exe
PID 1736 wrote to memory of 3668	1736	wincommon.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\ForceOp 2.8.7 - By RaiSence.exe
"C:\Users\Admin\AppData\Local\Temp\ForceOp 2.8.7 - By RaiSence.exe"
1⤵
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1196

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\intofont\1Udi0TDz635jTrMWFNrE4kqnOIuYIi.vbe"
2⤵
- Suspicious use of WriteProcessMemory
PID:3120

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\intofont\xLg6v1j1ZJy5DZ1pz826KfZq2BmfLM.bat" "
3⤵
- Suspicious use of WriteProcessMemory
PID:1364

C:\intofont\wincommon.exe
"C:\intofont\wincommon.exe"
4⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1736

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\PerfLogs\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:3656

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\Program Files\Common Files\DESIGNER\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:3940

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\Users\Default\My Documents\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:3340

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\Users\Admin\My Documents\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:492

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:1424

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\ProgramData\Package Cache\{ef6b00ec-13e1-4c25-9064-b2f383cb8412}\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:3804

C:\ProgramData\Package Cache\{ef6b00ec-13e1-4c25-9064-b2f383cb8412}\svchost.exe
"C:\ProgramData\Package Cache\{ef6b00ec-13e1-4c25-9064-b2f383cb8412}\svchost.exe"
5⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3668

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -u -p 3668 -s 1520
6⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1876

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\intofont\msg.vbs"
2⤵
PID:3192

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\ProgramData\Package Cache\{ef6b00ec-13e1-4c25-9064-b2f383cb8412}\svchost.exe

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C:\ProgramData\Package Cache\{ef6b00ec-13e1-4c25-9064-b2f383cb8412}\svchost.exe

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C:\intofont\1Udi0TDz635jTrMWFNrE4kqnOIuYIi.vbe

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C:\intofont\MOS

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C:\intofont\msg.vbs

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C:\intofont\wincommon.exe

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C:\intofont\wincommon.exe

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C:\intofont\xLg6v1j1ZJy5DZ1pz826KfZq2BmfLM.bat

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memory/492-18-0x0000000000000000-mapping.dmp

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memory/1364-7-0x0000000000000000-mapping.dmp

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memory/1424-19-0x0000000000000000-mapping.dmp

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memory/1736-11-0x00007FFC45280000-0x00007FFC45C6C000-memory.dmp

Filesize
9.9MB

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memory/1736-12-0x00000000006B0000-0x00000000006B1000-memory.dmp

Filesize
4KB

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memory/1736-8-0x0000000000000000-mapping.dmp

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memory/1736-14-0x000000001B1F0000-0x000000001B1F1000-memory.dmp

Filesize
4KB

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memory/1876-28-0x0000023AC5340000-0x0000023AC5341000-memory.dmp

Filesize
4KB

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memory/1876-47-0x0000023AC5FB0000-0x0000023AC5FB1000-memory.dmp

Filesize
4KB

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memory/1876-45-0x0000023AC5FB0000-0x0000023AC5FB1000-memory.dmp

Filesize
4KB

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memory/1876-44-0x0000023AC5FB0000-0x0000023AC5FB1000-memory.dmp

Filesize
4KB

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memory/3120-1-0x0000000000000000-mapping.dmp

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memory/3192-2-0x0000000000000000-mapping.dmp

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memory/3340-17-0x0000000000000000-mapping.dmp

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memory/3656-15-0x0000000000000000-mapping.dmp

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memory/3668-31-0x0000000000000000-mapping.dmp

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memory/3668-39-0x0000000000000000-mapping.dmp

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memory/3668-30-0x0000000000000000-mapping.dmp

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memory/3668-24-0x00007FFC45280000-0x00007FFC45C6C000-memory.dmp

Filesize
9.9MB

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memory/3668-32-0x0000000000000000-mapping.dmp

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memory/3668-33-0x0000000000000000-mapping.dmp

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memory/3668-34-0x0000000000000000-mapping.dmp

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memory/3668-35-0x0000000000000000-mapping.dmp

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memory/3668-36-0x0000000000000000-mapping.dmp

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memory/3668-29-0x0000000000000000-mapping.dmp

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memory/3668-40-0x0000000000000000-mapping.dmp

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memory/3668-41-0x0000000000000000-mapping.dmp

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memory/3668-38-0x0000000000000000-mapping.dmp

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memory/3668-37-0x0000000000000000-mapping.dmp

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memory/3668-42-0x0000000000000000-mapping.dmp

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memory/3668-43-0x0000000000000000-mapping.dmp

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memory/3668-21-0x0000000000000000-mapping.dmp

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memory/3804-20-0x0000000000000000-mapping.dmp

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memory/3940-16-0x0000000000000000-mapping.dmp

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