dcrat | 57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
23-01-2025 07:19

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General

Target

57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Size

783KB
MD5

678f3b5fe3ba32b044538facd3576d18
SHA1

4f67bfe0d9caa57d28394158147a2abbb6d44a95
SHA256

57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a
SHA512

75a028a56d24e88e9dc21d7e35639225e6207f634797f33c3c9f31f7b39b76b16e5feca1fe0c7a4030e66e587a8e58487712be89add55818fbf9019c887d17e8
SSDEEP

12288:mqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqKn:m+OQbpbgsFdAyQvzSqaq8qi

Score

10^/10

dcrat defense_evasion infostealer persistence 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
Dcrat family
dcrat

Process spawned unexpected child process 4 IoCs

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

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2480	3024	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2900	3024	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2852	3024	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2660	3024	schtasks.exe	30

UAC bypass 3 TTPs 6 IoCs

defense_evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	Idle.exe

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2344-1-0x0000000001130000-0x00000000011FA000-memory.dmp	dcrat
behavioral1/files/0x0008000000015d59-36.dat	dcrat
behavioral1/memory/332-72-0x0000000000AE0000-0x0000000000BAA000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
332	Idle.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\TSSysprep\\explorer.exe\""	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\MSOCache\\All Users\\Idle.exe\""	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "\"C:\\Windows\\msdfmap\\explorer.exe\""	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Windows\\PLA\\Reports\\ja-JP\\winlogon.exe\""	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

defense_evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Idle.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe

Drops file in Windows directory 12 IoCs

description	ioc	Process
File created	C:\Windows\msdfmap\explorer.exe	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File created	C:\Windows\PLA\Reports\ja-JP\winlogon.exe	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File created	C:\Windows\PLA\Reports\ja-JP\cc11b995f2a76da408ea6a601e682e64743153ad	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File opened for modification	C:\Windows\msdfmap\RCXA612.tmp	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File opened for modification	C:\Windows\msdfmap\explorer.exe	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File opened for modification	C:\Windows\TSSysprep\explorer.exe	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File created	C:\Windows\TSSysprep\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File opened for modification	C:\Windows\TSSysprep\RCXA20A.tmp	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File opened for modification	C:\Windows\PLA\Reports\ja-JP\RCXA883.tmp	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File opened for modification	C:\Windows\PLA\Reports\ja-JP\winlogon.exe	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File created	C:\Windows\TSSysprep\explorer.exe	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
File created	C:\Windows\msdfmap\7a0fd90576e08807bde2cc57bcf9854bbce05fe3	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.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 4 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2480	schtasks.exe
2900	schtasks.exe
2852	schtasks.exe
2660	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe
332	Idle.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Token: SeDebugPrivilege	332	Idle.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2344 wrote to memory of 1552	2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe	35
PID 2344 wrote to memory of 1552	2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe	35
PID 2344 wrote to memory of 1552	2344	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe	35
PID 1552 wrote to memory of 2120	1552	cmd.exe	37
PID 1552 wrote to memory of 2120	1552	cmd.exe	37
PID 1552 wrote to memory of 2120	1552	cmd.exe	37
PID 1552 wrote to memory of 332	1552	cmd.exe	38
PID 1552 wrote to memory of 332	1552	cmd.exe	38
PID 1552 wrote to memory of 332	1552	cmd.exe	38

System policy modification 1 TTPs 6 IoCs

defense_evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	Idle.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.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\57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe
"C:\Users\Admin\AppData\Local\Temp\57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a.exe"
1⤵
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2344
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\yCQhXywo7t.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1552
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2120
- - C:\MSOCache\All Users\Idle.exe
    "C:\MSOCache\All Users\Idle.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:332

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\TSSysprep\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2480

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\MSOCache\All Users\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Windows\msdfmap\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2852

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\PLA\Reports\ja-JP\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2660

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\yCQhXywo7t.bat

Filesize
194B

MD5
09a57518175d4cfc7520b9c5c5e3563a

SHA1
f507789d168747969b934b2d2ad9db717f3cd96c

SHA256
2ec830ae95590911f99951d7abb5ec5f52f97b271aadc01fa70eed260944abf1

SHA512
d732ae4239d1641d399dd5c9bad868db56249b6fd91b3fdfe4bc857e1e64fef5e415862223fb33e0729696370e24db4c478c35a2664828547dbf2caaf511da64

Download Submit
C:\Windows\TSSysprep\explorer.exe

Filesize
783KB

MD5
678f3b5fe3ba32b044538facd3576d18

SHA1
4f67bfe0d9caa57d28394158147a2abbb6d44a95

SHA256
57feb30bfa52e12db717f765271f337c2fb9b9f1799b7c6a6c2e9123c9d2b45a

SHA512
75a028a56d24e88e9dc21d7e35639225e6207f634797f33c3c9f31f7b39b76b16e5feca1fe0c7a4030e66e587a8e58487712be89add55818fbf9019c887d17e8

Download Submit
memory/332-72-0x0000000000AE0000-0x0000000000BAA000-memory.dmp

Filesize
808KB

Download
memory/2344-16-0x0000000000460000-0x0000000000468000-memory.dmp

Filesize
32KB

Download
memory/2344-14-0x0000000000470000-0x0000000000478000-memory.dmp

Filesize
32KB

Download
memory/2344-4-0x00000000003D0000-0x00000000003D8000-memory.dmp

Filesize
32KB

Download
memory/2344-3-0x00000000003C0000-0x00000000003C8000-memory.dmp

Filesize
32KB

Download
memory/2344-7-0x0000000000400000-0x000000000040C000-memory.dmp

Filesize
48KB

Download
memory/2344-8-0x0000000000440000-0x000000000044A000-memory.dmp

Filesize
40KB

Download
memory/2344-9-0x0000000000480000-0x000000000048A000-memory.dmp

Filesize
40KB

Download
memory/2344-10-0x0000000000420000-0x0000000000428000-memory.dmp

Filesize
32KB

Download
memory/2344-12-0x00000000004A0000-0x00000000004A8000-memory.dmp

Filesize
32KB

Download
memory/2344-11-0x0000000000430000-0x0000000000438000-memory.dmp

Filesize
32KB

Download
memory/2344-17-0x00000000004D0000-0x00000000004D8000-memory.dmp

Filesize
32KB

Download
memory/2344-0-0x000007FEF67F3000-0x000007FEF67F4000-memory.dmp

Filesize
4KB

Download
memory/2344-15-0x00000000004E0000-0x00000000004E8000-memory.dmp

Filesize
32KB

Download
memory/2344-6-0x00000000003F0000-0x00000000003F8000-memory.dmp

Filesize
32KB

Download
memory/2344-13-0x0000000000490000-0x0000000000498000-memory.dmp

Filesize
32KB

Download
memory/2344-18-0x0000000000410000-0x0000000000418000-memory.dmp

Filesize
32KB

Download
memory/2344-20-0x00000000004C0000-0x00000000004C8000-memory.dmp

Filesize
32KB

Download
memory/2344-19-0x00000000004B0000-0x00000000004B8000-memory.dmp

Filesize
32KB

Download
memory/2344-21-0x00000000004F0000-0x00000000004FC000-memory.dmp

Filesize
48KB

Download
memory/2344-22-0x0000000000500000-0x0000000000508000-memory.dmp

Filesize
32KB

Download
memory/2344-25-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-35-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-5-0x00000000003E0000-0x00000000003F0000-memory.dmp

Filesize
64KB

Download
memory/2344-62-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-2-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-69-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-1-0x0000000001130000-0x00000000011FA000-memory.dmp

Filesize
808KB

Download