dcrat | 1aeaabc57a89dd8508a5e997236b91b3cd7e584dad94700fcad9d8637d2b926d

General

Target

4D95EA8721D0A84B69C2D60951A8A65E.exe
Size

631KB
MD5

4d95ea8721d0a84b69c2d60951a8a65e
SHA1

b3b9230b284c32e8d35c65b6b31d0a1b729c6d7c
SHA256

1aeaabc57a89dd8508a5e997236b91b3cd7e584dad94700fcad9d8637d2b926d
SHA512

7500b73aa452a6452fd6fe41df0fbffa96821918df34fcff2a29bf2072f5fdb02886fa0945f5d567fefcf30de6d042b4e17e6760bb5e5a3ceba11767316c3fee
SSDEEP

12288:Cr2N7ewZcHjHkoP19jpVgUbdxGU2NjCa8UQGqIJ7uHXNI8W2Zx:Cr2EEypVg4x8NmtjS+

Score

10^/10

dcrat infostealer persistence rat spyware stealer

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 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

4D95EA8721D0A84B69C2D60951A8A65E.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:/Users/Admin/AppData/Local/\\spoolsv.exe\""	4D95EA8721D0A84B69C2D60951A8A65E.exe

Process spawned unexpected child process 3 IoCs

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

Processes:

schtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2780	2576	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2124	2576	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1284	2576	schtasks.exe	30

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/memory/2000-1-0x0000000000060000-0x0000000000104000-memory.dmp	dcrat
behavioral1/files/0x000d000000014348-13.dat	dcrat
behavioral1/memory/2792-15-0x0000000000080000-0x0000000000124000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

spoolsv.exe

pid	Process
2792	spoolsv.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

4D95EA8721D0A84B69C2D60951A8A65E.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:/Users/Admin/AppData/Local/\\spoolsv.exe\""	4D95EA8721D0A84B69C2D60951A8A65E.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:/Users/Admin/AppData/Local/\\spoolsv.exe\""	4D95EA8721D0A84B69C2D60951A8A65E.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 3 IoCs

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

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exeschtasks.exe

pid	Process
2124	schtasks.exe
1284	schtasks.exe
2780	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

Processes:

4D95EA8721D0A84B69C2D60951A8A65E.exespoolsv.exe

pid	Process
2000	4D95EA8721D0A84B69C2D60951A8A65E.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe
2792	spoolsv.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

spoolsv.exe

pid	Process
2792	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

4D95EA8721D0A84B69C2D60951A8A65E.exespoolsv.exe

description	pid	Process
Token: SeDebugPrivilege	2000	4D95EA8721D0A84B69C2D60951A8A65E.exe
Token: SeDebugPrivilege	2792	spoolsv.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

4D95EA8721D0A84B69C2D60951A8A65E.execmd.exe

description	pid	Process	procid_target
PID 2000 wrote to memory of 2876	2000	4D95EA8721D0A84B69C2D60951A8A65E.exe	34
PID 2000 wrote to memory of 2876	2000	4D95EA8721D0A84B69C2D60951A8A65E.exe	34
PID 2000 wrote to memory of 2876	2000	4D95EA8721D0A84B69C2D60951A8A65E.exe	34
PID 2876 wrote to memory of 2732	2876	cmd.exe	36
PID 2876 wrote to memory of 2732	2876	cmd.exe	36
PID 2876 wrote to memory of 2732	2876	cmd.exe	36
PID 2876 wrote to memory of 2792	2876	cmd.exe	37
PID 2876 wrote to memory of 2792	2876	cmd.exe	37
PID 2876 wrote to memory of 2792	2876	cmd.exe	37

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\4D95EA8721D0A84B69C2D60951A8A65E.exe
"C:\Users\Admin\AppData\Local\Temp\4D95EA8721D0A84B69C2D60951A8A65E.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2000
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\z6HEvTjygu.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2876
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2732
- - C:\Users\Admin\AppData\Local\spoolsv.exe
    "C:/Users/Admin/AppData/Local/\spoolsv.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:2792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 12 /tr "'C:/Users/Admin/AppData/Local/\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2780

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:/Users/Admin/AppData/Local/\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2124

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 10 /tr "'C:/Users/Admin/AppData/Local/\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1284

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

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\z6HEvTjygu.bat

Filesize
206B

MD5
7e3ff833be800acf8e560e100a746e46

SHA1
eef7cb47296936b6b1e6d687ca685678a8d9f3b3

SHA256
a1f26ddd8ba0f8840ad2a24932cef2b69712dc0a873c6c47f11b067c5c098147

SHA512
bb9c1973ff8564ee79cd188799a64ef9d148df3e0fb04dea4463146b9a9d969f61244832a44fbfefc3ab50c0fdfb383d68d212a543636ede5b53491a5dbdbdde

Download Submit
C:\Users\Admin\AppData\Local\spoolsv.exe

Filesize
631KB

MD5
4d95ea8721d0a84b69c2d60951a8a65e

SHA1
b3b9230b284c32e8d35c65b6b31d0a1b729c6d7c

SHA256
1aeaabc57a89dd8508a5e997236b91b3cd7e584dad94700fcad9d8637d2b926d

SHA512
7500b73aa452a6452fd6fe41df0fbffa96821918df34fcff2a29bf2072f5fdb02886fa0945f5d567fefcf30de6d042b4e17e6760bb5e5a3ceba11767316c3fee

Download Submit
memory/2000-0-0x000007FEF5EA3000-0x000007FEF5EA4000-memory.dmp

Filesize
4KB

Download
memory/2000-1-0x0000000000060000-0x0000000000104000-memory.dmp

Filesize
656KB

Download
memory/2000-2-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/2000-3-0x00000000004F0000-0x000000000050C000-memory.dmp

Filesize
112KB

Download
memory/2000-4-0x0000000000510000-0x0000000000526000-memory.dmp

Filesize
88KB

Download
memory/2000-11-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/2792-15-0x0000000000080000-0x0000000000124000-memory.dmp

Filesize
656KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads