dcrat | 23e67c1d86130177dd66de26bcf6da711f4d0b7c7be298b891f6ed78aaa92f6d

General

Target

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Size

2.7MB
MD5

d35b5bab08ed6803970d14f007dc8ee3
SHA1

b9613baaf96d486ed66de01a20d5f5c033909009
SHA256

23e67c1d86130177dd66de26bcf6da711f4d0b7c7be298b891f6ed78aaa92f6d
SHA512

6c5bf98751d014991d334b808c544dcdc73f02ba207b69ec524f2b2bcdc72c24d5b2b25100d56001e03b38c4977f4d16621fc0ea78ca899f67d92deeb6e7027f
SSDEEP

49152:vveqMsE56Ff0uutJufj+B5PcX/OtnDTtFjnbHIJZrZBBx5QfU:vv8aFDklB5PcX/mdF7bHIJZr3Bx5M

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

Process spawned unexpected child process 15 IoCs

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

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.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	2512	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4060	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4476	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2228	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3684	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	404	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	312	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	228	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	348	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	780	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4936	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3672	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4212	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4320	392	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1076	392	schtasks.exe

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exeexplorer.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	explorer.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral2/memory/4236-133-0x0000000000FA0000-0x000000000124E000-memory.dmp	dcrat
C:\Recovery\WindowsRE\dllhost.exe	dcrat
C:\ProgramData\explorer.exe	dcrat
C:\Users\All Users\explorer.exe	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

Processes:

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

Executes dropped EXE 1 IoCs

Processes:

explorer.exe

pid process

4540 explorer.exe

pid	process
4540	explorer.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exeexplorer.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	explorer.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

Drops file in Program Files directory 2 IoCs

Processes:

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

description	ioc	process
File created	C:\Program Files\Microsoft Office 15\Idle.exe	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
File created	C:\Program Files\Microsoft Office 15\6ccacd8608530f	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

Drops file in Windows directory 3 IoCs

Processes:

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

description	ioc	process
File created	C:\Windows\IME\es-ES\RuntimeBroker.exe	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
File opened for modification	C:\Windows\IME\es-ES\RuntimeBroker.exe	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
File created	C:\Windows\IME\es-ES\9e8d7a4ca61bd9	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 15 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.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	process
2228	schtasks.exe
312	schtasks.exe
4320	schtasks.exe
3684	schtasks.exe
348	schtasks.exe
1076	schtasks.exe
4476	schtasks.exe
228	schtasks.exe
780	schtasks.exe
4936	schtasks.exe
4212	schtasks.exe
2512	schtasks.exe
4060	schtasks.exe
404	schtasks.exe
3672	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exeexplorer.exe

pid process

4236 23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
4540 explorer.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exeexplorer.exe

description pid process

Token: SeDebugPrivilege 4236 23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Token: SeDebugPrivilege 4540 explorer.exe

pid	process
4236	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
4540	explorer.exe

description	pid	process
Token: SeDebugPrivilege	4236	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Token: SeDebugPrivilege	4540	explorer.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

description	pid	process	target process
PID 4236 wrote to memory of 4540	4236	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe	explorer.exe
PID 4236 wrote to memory of 4540	4236	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe	explorer.exe

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

T1112

Processes:

explorer.exe23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	explorer.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	explorer.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\23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe
"C:\Users\Admin\AppData\Local\Temp\23E67C1D86130177DD66DE26BCF6DA711F4D0B7C7BE29.exe"
1⤵
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4236

C:\Users\All Users\explorer.exe
"C:\Users\All Users\explorer.exe"
2⤵
- UAC bypass
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- System policy modification
PID:4540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Windows\IME\es-ES\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2512

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\IME\es-ES\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4060

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Windows\IME\es-ES\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Users\Public\Downloads\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Users\Public\Downloads\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Downloads\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 14 /tr "'C:\Users\All Users\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:312

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Users\All Users\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 9 /tr "'C:\Users\All Users\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:348

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 8 /tr "'C:\Program Files\Microsoft Office 15\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4936

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 8 /tr "'C:\Program Files\Microsoft Office 15\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3672

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4212

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1076

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Bypass User Account Control

1

T1088

Scheduled Task

1

T1053

Defense Evasion

Bypass User Account Control

1

T1088

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

3

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\ProgramData\explorer.exe
Filesize
2.7MB

MD5
d35b5bab08ed6803970d14f007dc8ee3

SHA1
b9613baaf96d486ed66de01a20d5f5c033909009

SHA256
23e67c1d86130177dd66de26bcf6da711f4d0b7c7be298b891f6ed78aaa92f6d

SHA512
6c5bf98751d014991d334b808c544dcdc73f02ba207b69ec524f2b2bcdc72c24d5b2b25100d56001e03b38c4977f4d16621fc0ea78ca899f67d92deeb6e7027f

Download Submit
C:\Recovery\WindowsRE\dllhost.exe
Filesize
2.7MB

MD5
d35b5bab08ed6803970d14f007dc8ee3

SHA1
b9613baaf96d486ed66de01a20d5f5c033909009

SHA256
23e67c1d86130177dd66de26bcf6da711f4d0b7c7be298b891f6ed78aaa92f6d

SHA512
6c5bf98751d014991d334b808c544dcdc73f02ba207b69ec524f2b2bcdc72c24d5b2b25100d56001e03b38c4977f4d16621fc0ea78ca899f67d92deeb6e7027f

Download Submit
C:\Users\All Users\explorer.exe
Filesize
2.7MB

MD5
d35b5bab08ed6803970d14f007dc8ee3

SHA1
b9613baaf96d486ed66de01a20d5f5c033909009

SHA256
23e67c1d86130177dd66de26bcf6da711f4d0b7c7be298b891f6ed78aaa92f6d

SHA512
6c5bf98751d014991d334b808c544dcdc73f02ba207b69ec524f2b2bcdc72c24d5b2b25100d56001e03b38c4977f4d16621fc0ea78ca899f67d92deeb6e7027f

Download Submit
memory/4236-133-0x0000000000FA0000-0x000000000124E000-memory.dmp

Filesize
2.7MB

Download
memory/4236-134-0x000000001C020000-0x000000001C030000-memory.dmp

Filesize
64KB

Download
memory/4236-135-0x0000000003350000-0x00000000033A0000-memory.dmp

Filesize
320KB

Download
memory/4236-136-0x000000001CB60000-0x000000001D088000-memory.dmp

Filesize
5.2MB

Download
memory/4236-158-0x000000001C020000-0x000000001C030000-memory.dmp

Filesize
64KB

Download
memory/4540-159-0x000000001B450000-0x000000001B460000-memory.dmp

Filesize
64KB

Download
memory/4540-160-0x000000001B450000-0x000000001B460000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads