dcrat | 6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc

General

Target

6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Size

2.1MB
MD5

3a32de4764e961e8726b94606a07b57a
SHA1

8489600185b3ce974e4003f9ee37abde5a0f5da2
SHA256

6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc
SHA512

e97a903b23d8d18553f7f7bbb474644f1ef89c5122822d404bcb4e740cbc9763d504b4241367a5beaa49ec6f6181734ae59c8bfba2119ba6e632866816434f08
SSDEEP

24576:zZxyxNwUMrdtki6lbi5YH63JUKUwcp4TOQdXzzBNhL+Ll8HOiD7Kl4kup3B2ngov:SHwLrdtkbaCwcp4RXL7D764zB2qHG

Score

10^/10

dcrat infostealer persistence 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 family
dcrat

Modifies WinLogon for persistence 2 TTPs 6 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\Favorites\\services.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\Favorites\\services.exe\", \"C:\\Users\\Admin\\AppData\\Local\\Temp\\RD15D0\\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\Favorites\\services.exe\", \"C:\\Users\\Admin\\AppData\\Local\\Temp\\RD15D0\\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe\", \"C:\\Users\\Public\\Libraries\\wininit.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\Favorites\\services.exe\", \"C:\\Users\\Admin\\AppData\\Local\\Temp\\RD15D0\\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe\", \"C:\\Users\\Public\\Libraries\\wininit.exe\", \"C:\\Windows\\System32\\MPSSVC\\winlogon.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\Favorites\\services.exe\", \"C:\\Users\\Admin\\AppData\\Local\\Temp\\RD15D0\\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe\", \"C:\\Users\\Public\\Libraries\\wininit.exe\", \"C:\\Windows\\System32\\MPSSVC\\winlogon.exe\", \"C:\\Documents and Settings\\Idle.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\Favorites\\services.exe\", \"C:\\Users\\Admin\\AppData\\Local\\Temp\\RD15D0\\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe\", \"C:\\Users\\Public\\Libraries\\wininit.exe\", \"C:\\Windows\\System32\\MPSSVC\\winlogon.exe\", \"C:\\Documents and Settings\\Idle.exe\", \"C:\\Windows\\System32\\mtxex\\csrss.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe

Process spawned unexpected child process 6 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	2796	2756	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2944	2756	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2820	2756	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2596	2756	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2568	2756	schtasks.exe	31
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2140	2756	schtasks.exe	31

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2932-1-0x0000000000A40000-0x0000000000C62000-memory.dmp	dcrat
behavioral1/files/0x0005000000019570-11.dat	dcrat
behavioral1/memory/1112-23-0x0000000000CE0000-0x0000000000F02000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1112	Idle.exe

Adds Run key to start application 2 TTPs 12 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\services = "\"C:\\ProgramData\\Favorites\\services.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\RD15D0\\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\RD15D0\\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Windows\\System32\\MPSSVC\\winlogon.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\Documents and Settings\\Idle.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\Documents and Settings\\Idle.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\services = "\"C:\\ProgramData\\Favorites\\services.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Users\\Public\\Libraries\\wininit.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Windows\\System32\\MPSSVC\\winlogon.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\mtxex\\csrss.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\System32\\mtxex\\csrss.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Users\\Public\\Libraries\\wininit.exe\""	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\System32\mtxex\886983d96e3d3e31032c679b2d4ea91b6c05afef	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
File created	C:\Windows\System32\MPSSVC\winlogon.exe	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
File created	C:\Windows\System32\MPSSVC\cc11b995f2a76da408ea6a601e682e64743153ad	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
File created	C:\Windows\System32\mtxex\csrss.exe	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.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 6 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
2796	schtasks.exe
2944	schtasks.exe
2820	schtasks.exe
2596	schtasks.exe
2568	schtasks.exe
2140	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2932	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
1112	Idle.exe
1112	Idle.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2932	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
Token: SeDebugPrivilege	1112	Idle.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2932 wrote to memory of 3040	2932	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe	38
PID 2932 wrote to memory of 3040	2932	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe	38
PID 2932 wrote to memory of 3040	2932	6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe	38
PID 3040 wrote to memory of 2876	3040	cmd.exe	40
PID 3040 wrote to memory of 2876	3040	cmd.exe	40
PID 3040 wrote to memory of 2876	3040	cmd.exe	40
PID 3040 wrote to memory of 1112	3040	cmd.exe	41
PID 3040 wrote to memory of 1112	3040	cmd.exe	41
PID 3040 wrote to memory of 1112	3040	cmd.exe	41

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\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe
"C:\Users\Admin\AppData\Local\Temp\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2932
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\1A27IR5ND6.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3040
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2876
- - C:\Documents and Settings\Idle.exe
    "C:\Documents and Settings\Idle.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1112

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\ProgramData\Favorites\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2796

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\RD15D0\6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2944

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Users\Public\Libraries\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2820

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\MPSSVC\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2596

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Documents and Settings\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2568

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\System32\mtxex\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2140

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\1A27IR5ND6.bat

Filesize
198B

MD5
cbd8f33ab616da7445f0cd40133ca4e8

SHA1
4d854aeaacb5dc964c4158de54b69f67fa7e7027

SHA256
373c838b9d63f4d11d7022dd296c883e6aae751c6e4e0f9afdc65a08772c1973

SHA512
9955d555cd302251c22e150657eabb28606028a13002a0f9eec3a6d581c0b1ef1ad70a9db461484ea1e0cba066ef4733b72029361af7420274606e90d89bfca2

Download Submit
C:\Users\Idle.exe

Filesize
2.1MB

MD5
3a32de4764e961e8726b94606a07b57a

SHA1
8489600185b3ce974e4003f9ee37abde5a0f5da2

SHA256
6b6db8b011dd68c40548c8ee860610a61fd6832914f25ffe631d0af51675a5fc

SHA512
e97a903b23d8d18553f7f7bbb474644f1ef89c5122822d404bcb4e740cbc9763d504b4241367a5beaa49ec6f6181734ae59c8bfba2119ba6e632866816434f08

Download Submit
memory/1112-25-0x00000000003D0000-0x00000000003D8000-memory.dmp

Filesize
32KB

Download
memory/1112-26-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/1112-31-0x00000000004C0000-0x00000000004C8000-memory.dmp

Filesize
32KB

Download
memory/1112-32-0x00000000004D0000-0x00000000004DC000-memory.dmp

Filesize
48KB

Download
memory/1112-23-0x0000000000CE0000-0x0000000000F02000-memory.dmp

Filesize
2.1MB

Download
memory/1112-24-0x00000000001C0000-0x00000000001CC000-memory.dmp

Filesize
48KB

Download
memory/1112-30-0x00000000004A0000-0x00000000004A8000-memory.dmp

Filesize
32KB

Download
memory/1112-28-0x00000000003E0000-0x00000000003E8000-memory.dmp

Filesize
32KB

Download
memory/1112-27-0x0000000000420000-0x0000000000476000-memory.dmp

Filesize
344KB

Download
memory/1112-29-0x0000000000480000-0x0000000000488000-memory.dmp

Filesize
32KB

Download
memory/2932-2-0x000007FEF5D20000-0x000007FEF670C000-memory.dmp

Filesize
9.9MB

Download
memory/2932-0-0x000007FEF5D23000-0x000007FEF5D24000-memory.dmp

Filesize
4KB

Download
memory/2932-20-0x000007FEF5D20000-0x000007FEF670C000-memory.dmp

Filesize
9.9MB

Download
memory/2932-1-0x0000000000A40000-0x0000000000C62000-memory.dmp

Filesize
2.1MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads