dcrat | 0e6fc77a72dd0b4c8f8fe7607c92eac7cf5b0d607c9904e09d9fb1b2128a2e51

Analysis

max time kernel
148s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
01-11-2024 08:01

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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/\\TextInputHost.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	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4916	4160	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4476	4160	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	656	4160	schtasks.exe	84

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral5/memory/2600-1-0x0000000000B70000-0x0000000000C14000-memory.dmp	dcrat
behavioral5/files/0x000c000000023b2b-17.dat	dcrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

ptjjsekfthse.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	ptjjsekfthse.exe

Executes dropped EXE 1 IoCs

Processes:

TextInputHost.exe

pid	Process
4696	TextInputHost.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:

ptjjsekfthse.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\TextInputHost = "\"C:/Users/Admin/AppData/Local/\\TextInputHost.exe\""	ptjjsekfthse.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\TextInputHost = "\"C:/Users/Admin/AppData/Local/\\TextInputHost.exe\""	ptjjsekfthse.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

Processes:

ptjjsekfthse.exe

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000_Classes\Local Settings	ptjjsekfthse.exe

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
4916	schtasks.exe
4476	schtasks.exe
656	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

Processes:

ptjjsekfthse.exeTextInputHost.exe

pid	Process
2600	ptjjsekfthse.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe
4696	TextInputHost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

TextInputHost.exe

pid	Process
4696	TextInputHost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ptjjsekfthse.exeTextInputHost.exe

description	pid	Process
Token: SeDebugPrivilege	2600	ptjjsekfthse.exe
Token: SeDebugPrivilege	4696	TextInputHost.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

ptjjsekfthse.execmd.exe

description	pid	Process	procid_target
PID 2600 wrote to memory of 4972	2600	ptjjsekfthse.exe	89
PID 2600 wrote to memory of 4972	2600	ptjjsekfthse.exe	89
PID 4972 wrote to memory of 4048	4972	cmd.exe	92
PID 4972 wrote to memory of 4048	4972	cmd.exe	92
PID 4972 wrote to memory of 4696	4972	cmd.exe	96
PID 4972 wrote to memory of 4696	4972	cmd.exe	96

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
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2600
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\MY4o16UQxx.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4972
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:4048
- - C:\Users\Admin\AppData\Local\TextInputHost.exe
    "C:/Users/Admin/AppData/Local/\TextInputHost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:4696

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 7 /tr "'C:/Users/Admin/AppData/Local/\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4916

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:/Users/Admin/AppData/Local/\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 7 /tr "'C:/Users/Admin/AppData/Local/\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:656

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\Temp\MY4o16UQxx.bat

Filesize
212B

MD5
dcad02155a6cbf2d20775e9c3ba34b98

SHA1
5c1ff7dc050daa9cc5180d7ef1d2f9cecdc6a810

SHA256
052d5b8302c6fcdb54332e720cfc05ac676dbb44e25e5ca8d6559ebb85d31f27

SHA512
df486ab9fec4d2e708fb4be7ae919476271dcdcde1de2f3c733922a3c90362ac9824cba321de3ca9832f827ff731fdee4874705228f571eb5ab3a894338792b8

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

Filesize
631KB

MD5
4d95ea8721d0a84b69c2d60951a8a65e

SHA1
b3b9230b284c32e8d35c65b6b31d0a1b729c6d7c

SHA256
1aeaabc57a89dd8508a5e997236b91b3cd7e584dad94700fcad9d8637d2b926d

SHA512
7500b73aa452a6452fd6fe41df0fbffa96821918df34fcff2a29bf2072f5fdb02886fa0945f5d567fefcf30de6d042b4e17e6760bb5e5a3ceba11767316c3fee

Download Submit
memory/2600-0-0x00007FFD35A03000-0x00007FFD35A05000-memory.dmp

Filesize
8KB

Download
memory/2600-1-0x0000000000B70000-0x0000000000C14000-memory.dmp

Filesize
656KB

Download
memory/2600-2-0x0000000002D40000-0x0000000002D5C000-memory.dmp

Filesize
112KB

Download
memory/2600-3-0x00007FFD35A00000-0x00007FFD364C1000-memory.dmp

Filesize
10.8MB

Download
memory/2600-4-0x000000001B7C0000-0x000000001B810000-memory.dmp

Filesize
320KB

Download
memory/2600-5-0x0000000002D60000-0x0000000002D76000-memory.dmp

Filesize
88KB

Download
memory/2600-13-0x00007FFD35A00000-0x00007FFD364C1000-memory.dmp

Filesize
10.8MB

Download