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 3636 created 1888 3636 WerFault.exe wscript.exe
Executes dropped EXE 2 IoCs

Processes:

wincommon.exewscript.exe

pid process

3772 wincommon.exe
1888 wscript.exe

description	pid	process	target process
PID 3636 created 1888	3636	WerFault.exe	wscript.exe

Drops file in Program Files directory 4 IoCs

Processes:

wincommon.exe

description	ioc	process
File created	C:\Program Files\Microsoft Office 15\ClientX64\svchost.exe	wincommon.exe
File created	C:\Program Files\Microsoft Office 15\ClientX64\f4d236fdec2fd03914189c3b26e5cb0dfea9d761	wincommon.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\System.exe	wincommon.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\27d1bcfc3c54e0e44ea423ffd4ee81fe73670a2a	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

3636 1888 WerFault.exe wscript.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

3612 schtasks.exe
2136 schtasks.exe
1136 schtasks.exe
3648 schtasks.exe
2084 schtasks.exe
1508 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
3636	1888	WerFault.exe	wscript.exe

pid	process
3612	schtasks.exe
2136	schtasks.exe
1136	schtasks.exe
3648	schtasks.exe
2084	schtasks.exe
1508	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.exewscript.exeWerFault.exe

pid	process
3772	wincommon.exe
1888	wscript.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe
3636	WerFault.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

wincommon.exewscript.exeWerFault.exe

description pid process

Token: SeDebugPrivilege 3772 wincommon.exe
Token: SeDebugPrivilege 1888 wscript.exe
Token: SeDebugPrivilege 3636 WerFault.exe

description	pid	process
Token: SeDebugPrivilege	3772	wincommon.exe
Token: SeDebugPrivilege	1888	wscript.exe
Token: SeDebugPrivilege	3636	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 3276 wrote to memory of 2540	3276	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 3276 wrote to memory of 2540	3276	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 3276 wrote to memory of 2540	3276	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 3276 wrote to memory of 3412	3276	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 3276 wrote to memory of 3412	3276	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 3276 wrote to memory of 3412	3276	ForceOp 2.8.7 - By RaiSence.exe	WScript.exe
PID 2540 wrote to memory of 1148	2540	WScript.exe	cmd.exe
PID 2540 wrote to memory of 1148	2540	WScript.exe	cmd.exe
PID 2540 wrote to memory of 1148	2540	WScript.exe	cmd.exe
PID 1148 wrote to memory of 3772	1148	cmd.exe	wincommon.exe
PID 1148 wrote to memory of 3772	1148	cmd.exe	wincommon.exe
PID 3772 wrote to memory of 3612	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 3612	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 2136	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 2136	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 1136	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 1136	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 3648	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 3648	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 2084	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 2084	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 1508	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 1508	3772	wincommon.exe	schtasks.exe
PID 3772 wrote to memory of 1888	3772	wincommon.exe	wscript.exe
PID 3772 wrote to memory of 1888	3772	wincommon.exe	wscript.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:3276

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\intofont\1Udi0TDz635jTrMWFNrE4kqnOIuYIi.vbe"
2⤵
- Suspicious use of WriteProcessMemory
PID:2540

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\intofont\xLg6v1j1ZJy5DZ1pz826KfZq2BmfLM.bat" "
3⤵
- Suspicious use of WriteProcessMemory
PID:1148

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:3772

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\odt\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:3612

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "smss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\smss.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:2136

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\intofont\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:1136

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svchost" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\ClientX64\svchost.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:3648

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "System" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\System.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:2084

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "wscript" /sc ONLOGON /tr "'C:\PerfLogs\wscript.exe'" /rl HIGHEST /f
5⤵
- Creates scheduled task(s)
PID:1508

C:\PerfLogs\wscript.exe
"C:\PerfLogs\wscript.exe"
5⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1888

C:\Windows\system32\WerFault.exe
C:\Windows\system32\WerFault.exe -u -p 1888 -s 1796
6⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3636

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\intofont\msg.vbs"
2⤵
PID:3412

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:\PerfLogs\wscript.exe
MD5
9134637118b2a4485fb46d439133749b

SHA1
25b60dba36e432f53f68603797d50b9c6cc127ce

SHA256
5dca1a463f5308018c477503a5179f45c468245dd4a84732ee824bd704521acc

SHA512
a6db12e3349c034051940b15adbb530ba34152ccbe41afc210dad7e64331221b3dbae1563a2f3b79a43d12da54eaeac3f30cfb708ebc75ab6a9dfc30a8f1e601

Download Submit
C:\PerfLogs\wscript.exe
MD5
9134637118b2a4485fb46d439133749b

SHA1
25b60dba36e432f53f68603797d50b9c6cc127ce

SHA256
5dca1a463f5308018c477503a5179f45c468245dd4a84732ee824bd704521acc

SHA512
a6db12e3349c034051940b15adbb530ba34152ccbe41afc210dad7e64331221b3dbae1563a2f3b79a43d12da54eaeac3f30cfb708ebc75ab6a9dfc30a8f1e601

Download Submit
C:\intofont\1Udi0TDz635jTrMWFNrE4kqnOIuYIi.vbe
MD5
35f693ab095c33d4c62230d69ff6b43f

SHA1
19e8b126076b5e5d8e8b97f3757ad99357915bf4

SHA256
1a3b550ae14c360fd9600e52924706a356290939317f3a32b35bfa97b5dbc163

SHA512
1e2599c7b10a1fc5c004d7d68c487028d5d2d6a1102af0150ea0c15663819dac42e3a55a769cc532cf45f9f037cece3fcdc2820f2bfbe8439fd0a3d5a16bb4df

Download Submit
C:\intofont\MOS
MD5
cb456215c3333db0551bd0788bc258c7

SHA1
a0b861f6121344b631992c8252fa8748835e4df6

SHA256
7e7b3a01539b5dd82108fe0dc455a76294708bb782f8f7590b06f0975fdf93c1

SHA512
796ccc0f1fc4a990fe3c50f54a2d009e6ddb8e4e062ac1839a2c2c1e6f120311dad66fa86211137cb38cce27a99614085702d5fe9b6f3effc5dd1db0ad879448

Download Submit
C:\intofont\msg.vbs
MD5
01c71ea2d98437129936261c48403132

SHA1
dc689fb68a3e7e09a334e7a37c0d10d0641af1a6

SHA256
0401f2dd76d5ed6f90c82b72e1e7a122ef127bedbaf717532c4bba26d43a0061

SHA512
a668d4216a50ccc699221dd902d8b0f864e44368dc7474fa5659a739154d4e769b85d49b60a73affb8fba7628e7210b0f8106d5652006d1bbba67083513e65d9

Download Submit
C:\intofont\wincommon.exe
MD5
9134637118b2a4485fb46d439133749b

SHA1
25b60dba36e432f53f68603797d50b9c6cc127ce

SHA256
5dca1a463f5308018c477503a5179f45c468245dd4a84732ee824bd704521acc

SHA512
a6db12e3349c034051940b15adbb530ba34152ccbe41afc210dad7e64331221b3dbae1563a2f3b79a43d12da54eaeac3f30cfb708ebc75ab6a9dfc30a8f1e601

Download Submit
C:\intofont\wincommon.exe
MD5
9134637118b2a4485fb46d439133749b

SHA1
25b60dba36e432f53f68603797d50b9c6cc127ce

SHA256
5dca1a463f5308018c477503a5179f45c468245dd4a84732ee824bd704521acc

SHA512
a6db12e3349c034051940b15adbb530ba34152ccbe41afc210dad7e64331221b3dbae1563a2f3b79a43d12da54eaeac3f30cfb708ebc75ab6a9dfc30a8f1e601

Download Submit
C:\intofont\xLg6v1j1ZJy5DZ1pz826KfZq2BmfLM.bat
MD5
9fe442702fb57ffec2b831c3949a74e0

SHA1
e285d89241ef0aeeeb50f65e09a741baf399cb1f

SHA256
d50176a5de27bc9b4c52ebb4e30ec4cbf1e6a79eda4d83a013b220f489a5bcb9

SHA512
548a8df7f0d9278f84eca35bf40638a4572cb625050f7a0684ee14b2117df8307101d8f9383c3fcab23fcf656c21f69db3f4509a037307ed6658ff4c063b4eab

Download Submit
memory/1136-28-0x0000000000000000-mapping.dmp

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memory/1148-18-0x0000000000000000-mapping.dmp

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memory/1508-31-0x0000000000000000-mapping.dmp

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memory/1888-47-0x0000000000000000-mapping.dmp

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memory/1888-42-0x0000000000000000-mapping.dmp

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memory/1888-54-0x0000000000000000-mapping.dmp

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memory/1888-53-0x0000000000000000-mapping.dmp

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memory/1888-52-0x0000000000000000-mapping.dmp

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memory/1888-51-0x0000000000000000-mapping.dmp

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memory/1888-50-0x0000000000000000-mapping.dmp

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memory/1888-49-0x0000000000000000-mapping.dmp

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memory/1888-32-0x0000000000000000-mapping.dmp

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memory/1888-46-0x0000000000000000-mapping.dmp

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memory/1888-48-0x0000000000000000-mapping.dmp

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memory/1888-35-0x00007FFED8500000-0x00007FFED8EEC000-memory.dmp

Filesize
9.9MB

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memory/1888-43-0x0000000000000000-mapping.dmp

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memory/1888-41-0x0000000000000000-mapping.dmp

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memory/1888-40-0x0000000000000000-mapping.dmp

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memory/1888-45-0x0000000000000000-mapping.dmp

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memory/1888-44-0x0000000000000000-mapping.dmp

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memory/2084-30-0x0000000000000000-mapping.dmp

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memory/2136-27-0x0000000000000000-mapping.dmp

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memory/2540-0-0x0000000000000000-mapping.dmp

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memory/3412-14-0x0000000000000000-mapping.dmp

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memory/3612-26-0x0000000000000000-mapping.dmp

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memory/3636-39-0x0000017402A40000-0x0000017402A41000-memory.dmp

Filesize
4KB

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memory/3636-55-0x0000017403C40000-0x0000017403C41000-memory.dmp

Filesize
4KB

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memory/3648-29-0x0000000000000000-mapping.dmp

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memory/3772-25-0x000000001B9E0000-0x000000001B9E1000-memory.dmp

Filesize
4KB

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memory/3772-19-0x0000000000000000-mapping.dmp

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memory/3772-22-0x00007FFED8500000-0x00007FFED8EEC000-memory.dmp

Filesize
9.9MB

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memory/3772-23-0x0000000000C90000-0x0000000000C91000-memory.dmp

Filesize
4KB

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