dcrat | d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce

General

Target

d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe
Size

2.5MB
MD5

2933b54db3817abdc91b58f70ae31b71
SHA1

d4b7d3a213882a16e43b37472cf40b50b6573fde
SHA256

d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce
SHA512

a35552886749a4ee9d986f32a5128b81c8df83b152a40d23a16ab04e06e56873cf9b7ba90ebbaeaf14ebf08ce3504fe74941e88a6972eb376551b727725ff764
SSDEEP

49152:VbA3GkdXjptfoI3eJIzQ6qTr7X3MFSu+L39lx:VbSXjptfoOeJ56qL8S9/

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 7 IoCs

DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

rat infostealer dcrat

description	ioc	pid	Process
		2908	schtasks.exe
		604	schtasks.exe
		2728	schtasks.exe
		2996	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language		d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe
		2920	schtasks.exe
		1844	schtasks.exe

Dcrat family
dcrat

Modifies WinLogon for persistence 2 TTPs 2 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:/Users/Admin/AppData/Local/Microsoft\\WmiPrvSE.exe\", \"C:/Users/Admin/AppData/Local/Microsoft\\lsass.exe\""	PortSurrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:/Users/Admin/AppData/Local/Microsoft\\WmiPrvSE.exe\""	PortSurrogate.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	2920	1048	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1844	1048	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2996	1048	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2908	1048	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	604	1048	schtasks.exe	35
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2728	1048	schtasks.exe	35

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000015d07-12.dat	dcrat
behavioral1/memory/1632-13-0x0000000001120000-0x0000000001370000-memory.dmp	dcrat
behavioral1/memory/2832-31-0x0000000000FA0000-0x00000000011F0000-memory.dmp	dcrat

Executes dropped EXE 3 IoCs

pid	Process
1632	PortSurrogate.exe
2584	PortSurrogate.exe
2832	lsass.exe

Loads dropped DLL 2 IoCs

pid	Process
2976	cmd.exe
2976	cmd.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\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:/Users/Admin/AppData/Local/Microsoft\\WmiPrvSE.exe\""	PortSurrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:/Users/Admin/AppData/Local/Microsoft\\WmiPrvSE.exe\""	PortSurrogate.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:/Users/Admin/AppData/Local/Microsoft\\lsass.exe\""	PortSurrogate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsass = "\"C:/Users/Admin/AppData/Local/Microsoft\\lsass.exe\""	PortSurrogate.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

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
1844	schtasks.exe
2996	schtasks.exe
2908	schtasks.exe
604	schtasks.exe
2728	schtasks.exe
2920	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1632	PortSurrogate.exe
2584	PortSurrogate.exe
2832	lsass.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1632	PortSurrogate.exe
Token: SeDebugPrivilege	2584	PortSurrogate.exe
Token: SeDebugPrivilege	2832	lsass.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2756 wrote to memory of 2676	2756	d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe	31
PID 2756 wrote to memory of 2676	2756	d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe	31
PID 2756 wrote to memory of 2676	2756	d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe	31
PID 2756 wrote to memory of 2676	2756	d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe	31
PID 2676 wrote to memory of 2976	2676	WScript.exe	32
PID 2676 wrote to memory of 2976	2676	WScript.exe	32
PID 2676 wrote to memory of 2976	2676	WScript.exe	32
PID 2676 wrote to memory of 2976	2676	WScript.exe	32
PID 2976 wrote to memory of 1632	2976	cmd.exe	34
PID 2976 wrote to memory of 1632	2976	cmd.exe	34
PID 2976 wrote to memory of 1632	2976	cmd.exe	34
PID 2976 wrote to memory of 1632	2976	cmd.exe	34
PID 1632 wrote to memory of 2584	1632	PortSurrogate.exe	39
PID 1632 wrote to memory of 2584	1632	PortSurrogate.exe	39
PID 1632 wrote to memory of 2584	1632	PortSurrogate.exe	39
PID 2584 wrote to memory of 2832	2584	PortSurrogate.exe	43
PID 2584 wrote to memory of 2832	2584	PortSurrogate.exe	43
PID 2584 wrote to memory of 2832	2584	PortSurrogate.exe	43

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\d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe
"C:\Users\Admin\AppData\Local\Temp\d705a583afd303cbbbddc87d9f4de9387f2f5e10630f46ae4adee5ee5ff180ce.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2756
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\runtimehost\3mkQ5Vei8pV9InhfGoeqDlnAiAlSPa.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2676
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\runtimehost\PdpiKuXv6EuFyAXFTWqHw2RT.bat" "
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2976
  - - C:\runtimehost\PortSurrogate.exe
      "C:\runtimehost\PortSurrogate.exe"
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Adds Run key to start application
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1632
    - - C:\runtimehost\PortSurrogate.exe
        
        "C:\runtimehost\PortSurrogate.exe"
        5⤵
        Modifies WinLogon for persistence
        Executes dropped EXE
        Adds Run key to start application
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:2584
      - C:\Users\Admin\AppData\Local\Microsoft\lsass.exe
        
        "C:\Users\Admin\AppData\Local\Microsoft\lsass.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2832

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 12 /tr "'C:/Users/Admin/AppData/Local/Microsoft\WmiPrvSE.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2920

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:/Users/Admin/AppData/Local/Microsoft\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1844

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 11 /tr "'C:/Users/Admin/AppData/Local/Microsoft\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2996

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 14 /tr "'C:/Users/Admin/AppData/Local/Microsoft\lsass.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2908

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:/Users/Admin/AppData/Local/Microsoft\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:604

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 10 /tr "'C:/Users/Admin/AppData/Local/Microsoft\lsass.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2728

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\runtimehost\3mkQ5Vei8pV9InhfGoeqDlnAiAlSPa.vbe

Filesize
212B

MD5
8a7b7145f3e1dc4cd5535ad5c8fad2d4

SHA1
871db235a3ee0f38a6b286552d94352cc7af7d73

SHA256
bedaae27cc003eabe1573c8f084c91782b3b245dc0e7b4da6781e795edeee370

SHA512
9e5412732ba683b28b0d2176f0d3a504065a2ce56c1e3539d65dc413499d85071ef82675aaa8019b16903d681eb50f35b133bb88b48cf509d2f8242e8c717692

Download Submit
C:\runtimehost\PdpiKuXv6EuFyAXFTWqHw2RT.bat

Filesize
34B

MD5
f88bbae1814263b066d3d191d28e71b7

SHA1
1c1cdbfa0aa34e5240856f00cddffe2dccd94d2a

SHA256
0e058470ed95daa5da5075a4047a7f2090bcbb439ce975ff78bff72af9bc5035

SHA512
c0f47280c8559c5aef969e2f97e7787331daf3dd20c8f4c9b4d829a976a718b9888764babf4c200e15cbdb7bfd34f8cc07300b6ef23beff45b6f20fd9782eebf

Download Submit
C:\runtimehost\PortSurrogate.exe

Filesize
2.3MB

MD5
76842313355a159ae3f15beb42b7523c

SHA1
f07888bc191e4d7f42908b66a1ae9600a5d82d4e

SHA256
a2b1a70b88ad260dadf9f99d38f850e7256e3f9ba6f1d96ac017c70d81f7c262

SHA512
9f66f217faacf5ed8684b778b305cdfd3c66f99e11fc0adb330221db2f75c5d2798a701b8a55aa7da94fead1fd94052242e094313c641d5b21c3e314667ce330

Download Submit
memory/1632-13-0x0000000001120000-0x0000000001370000-memory.dmp

Filesize
2.3MB

Download
memory/1632-14-0x0000000000330000-0x000000000034C000-memory.dmp

Filesize
112KB

Download
memory/1632-15-0x0000000000350000-0x0000000000366000-memory.dmp

Filesize
88KB

Download
memory/1632-16-0x0000000000370000-0x00000000003C6000-memory.dmp

Filesize
344KB

Download
memory/1632-17-0x00000000003C0000-0x00000000003D2000-memory.dmp

Filesize
72KB

Download
memory/1632-18-0x00000000003F0000-0x00000000003FE000-memory.dmp

Filesize
56KB

Download
memory/1632-19-0x0000000000550000-0x0000000000558000-memory.dmp

Filesize
32KB

Download
memory/2832-31-0x0000000000FA0000-0x00000000011F0000-memory.dmp

Filesize
2.3MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads