dcrat | 2ab209c8b13fc820c0f2cd15de422053e94e2ca02b939ff97eeb2abceb5bb810

Analysis

max time kernel
148s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
12-06-2023 14:16

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General

Target

file.exe
Size

897KB
MD5

3a68a2cbeb827588f3749568b121a79b
SHA1

a40fc3b0c547826353088baf247b379f1e10f25d
SHA256

2ab209c8b13fc820c0f2cd15de422053e94e2ca02b939ff97eeb2abceb5bb810
SHA512

7ab8bb1605cfed214d05c6dac5dc05df0b66c90e7abe67629e8c879483d5f2784edae832f48acfc92c968a3da1f13e76e5db699890ed85b0c00bb551e0e70b7d
SSDEEP

12288:x7Gmaojeh4hLyhLk9el5ih7XrIqEMbs0qFvPrVc8Ml1T5J4rNl99uF04r4hZZ1v6:MTMYP2tP4CKdKh

Score

10^/10

dcrat 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 payload 1 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral2/memory/3432-133-0x0000000000400000-0x00000000004CE000-memory.dmp	dcrat

Drops file in System32 directory 2 IoCs

Processes:

svchost.exe

description	ioc	process
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{C6EDF791-6F43-4FCF-A358-662DC9B717E3}.catalogItem	svchost.exe
File created	C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\InstallService\{A16B432B-313B-4426-A271-48AC476FAB34}.catalogItem	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

file.exe

description pid process target process

PID 1876 set thread context of 3432 1876 file.exe AppLaunch.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2800 1876 WerFault.exe file.exe

description	pid	process	target process
PID 1876 set thread context of 3432	1876	file.exe	AppLaunch.exe

pid	pid_target	process	target process
2800	1876	WerFault.exe	file.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

svchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	svchost.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

svchost.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	svchost.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	svchost.exe

Suspicious behavior: EnumeratesProcesses 13 IoCs

Processes:

AppLaunch.exe

pid	process
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe
3432	AppLaunch.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

AppLaunch.exe

pid process

3432 AppLaunch.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

AppLaunch.exe

description pid process

Token: SeDebugPrivilege 3432 AppLaunch.exe

description	pid	process
Token: SeDebugPrivilege	3432	AppLaunch.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

file.exe

description	pid	process	target process
PID 1876 wrote to memory of 3432	1876	file.exe	AppLaunch.exe
PID 1876 wrote to memory of 3432	1876	file.exe	AppLaunch.exe
PID 1876 wrote to memory of 3432	1876	file.exe	AppLaunch.exe
PID 1876 wrote to memory of 3432	1876	file.exe	AppLaunch.exe
PID 1876 wrote to memory of 3432	1876	file.exe	AppLaunch.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\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1876

C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:3432

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1876 -s 152
2⤵
- Program crash
PID:2800

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k netsvcs -p
1⤵
- Drops file in System32 directory
- Checks processor information in registry
- Enumerates system info in registry
PID:4876

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1876 -ip 1876
1⤵
PID:3128

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/3432-133-0x0000000000400000-0x00000000004CE000-memory.dmp

Filesize
824KB

Download
memory/3432-138-0x0000000005B90000-0x0000000006134000-memory.dmp

Filesize
5.6MB

Download
memory/3432-139-0x0000000004E80000-0x0000000004E90000-memory.dmp

Filesize
64KB

Download
memory/3432-140-0x00000000057B0000-0x0000000005800000-memory.dmp

Filesize
320KB

Download
memory/3432-141-0x0000000006670000-0x0000000006B9C000-memory.dmp

Filesize
5.2MB

Download
memory/3432-142-0x0000000006140000-0x00000000061A6000-memory.dmp

Filesize
408KB

Download
memory/3432-145-0x0000000007040000-0x00000000070D2000-memory.dmp

Filesize
584KB

Download
memory/3432-146-0x0000000004E80000-0x0000000004E90000-memory.dmp

Filesize
64KB

Download