dcrat | 0e6fc77a72dd0b4c8f8fe7607c92eac7cf5b0d607c9904e09d9fb1b2128a2e51

Analysis

max time kernel
148s
max time network
151s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
01-11-2024 08:13

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General

Target

-pril-main/ptjjsekfthse.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:

ptjjsekfthse.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:/Users/Admin/AppData/Local/\\smss.exe\""	ptjjsekfthse.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
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3044	2820	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2052	2820	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2864	2820	schtasks.exe

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral9/memory/2744-1-0x00000000010C0000-0x0000000001164000-memory.dmp	dcrat
C:\Users\Admin\AppData\Local\smss.exe	dcrat
behavioral9/memory/2828-14-0x00000000002F0000-0x0000000000394000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

smss.exe

pid process

2828 smss.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

pid	process
2828	smss.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

ptjjsekfthse.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2703099537-420551529-3771253338-1000\Software\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:/Users/Admin/AppData/Local/\\smss.exe\""	ptjjsekfthse.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:/Users/Admin/AppData/Local/\\smss.exe\""	ptjjsekfthse.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

2052 schtasks.exe
2864 schtasks.exe
3044 schtasks.exe

pid	process
2052	schtasks.exe
2864	schtasks.exe
3044	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

Processes:

ptjjsekfthse.exesmss.exe

pid	process
2744	ptjjsekfthse.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe
2828	smss.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

smss.exe

pid process

2828 smss.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ptjjsekfthse.exesmss.exe

description pid process

Token: SeDebugPrivilege 2744 ptjjsekfthse.exe
Token: SeDebugPrivilege 2828 smss.exe

pid	process
2828	smss.exe

description	pid	process
Token: SeDebugPrivilege	2744	ptjjsekfthse.exe
Token: SeDebugPrivilege	2828	smss.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

ptjjsekfthse.exe

description	pid	process	target process
PID 2744 wrote to memory of 2828	2744	ptjjsekfthse.exe	smss.exe
PID 2744 wrote to memory of 2828	2744	ptjjsekfthse.exe	smss.exe
PID 2744 wrote to memory of 2828	2744	ptjjsekfthse.exe	smss.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\-pril-main\ptjjsekfthse.exe
"C:\Users\Admin\AppData\Local\Temp\-pril-main\ptjjsekfthse.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2744

C:\Users\Admin\AppData\Local\smss.exe
"C:\Users\Admin\AppData\Local\smss.exe"
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:2828

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 11 /tr "'C:/Users/Admin/AppData/Local/\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3044

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:/Users/Admin/AppData/Local/\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2052

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 8 /tr "'C:/Users/Admin/AppData/Local/\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2864

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

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\smss.exe

Filesize
631KB

MD5
4d95ea8721d0a84b69c2d60951a8a65e

SHA1
b3b9230b284c32e8d35c65b6b31d0a1b729c6d7c

SHA256
1aeaabc57a89dd8508a5e997236b91b3cd7e584dad94700fcad9d8637d2b926d

SHA512
7500b73aa452a6452fd6fe41df0fbffa96821918df34fcff2a29bf2072f5fdb02886fa0945f5d567fefcf30de6d042b4e17e6760bb5e5a3ceba11767316c3fee

Download Submit
memory/2744-0-0x000007FEF5AF3000-0x000007FEF5AF4000-memory.dmp

Filesize
4KB

Download
memory/2744-1-0x00000000010C0000-0x0000000001164000-memory.dmp

Filesize
656KB

Download
memory/2744-2-0x000007FEF5AF0000-0x000007FEF64DC000-memory.dmp

Filesize
9.9MB

Download
memory/2744-3-0x0000000000430000-0x000000000044C000-memory.dmp

Filesize
112KB

Download
memory/2744-4-0x00000000004E0000-0x00000000004F6000-memory.dmp

Filesize
88KB

Download
memory/2744-13-0x000007FEF5AF0000-0x000007FEF64DC000-memory.dmp

Filesize
9.9MB

Download
memory/2828-14-0x00000000002F0000-0x0000000000394000-memory.dmp

Filesize
656KB

Download