Resubmissions

31-10-2022 17:27

221031-v1vn5abeh3 8

27-10-2022 21:15

221027-z3xzgsddh9 8

27-10-2022 20:25

221027-y7pcgadch3 10

26-10-2022 00:45

221026-a34dtsecd6 8

25-10-2022 23:13

221025-27kk3aebd3 1

General

  • Target

    http://135.181.168.27

  • Sample

    221027-y7pcgadch3

Malware Config

Targets

    • Target

      http://135.181.168.27

    • DcRat

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

    • Modifies WinLogon for persistence

    • Modifies security service

    • Process spawned unexpected child process

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

    • UAC bypass

    • DCRat payload

      Detects payload of DCRat, commonly dropped by NSIS installers.

    • Downloads MZ/PE file

    • Executes dropped EXE

    • Possible privilege escalation attempt

    • Stops running service(s)

    • Checks computer location settings

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

    • Loads dropped DLL

    • Modifies file permissions

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Winlogon Helper DLL

1
T1004

Modify Existing Service

2
T1031

Registry Run Keys / Startup Folder

1
T1060

Scheduled Task

1
T1053

Privilege Escalation

Bypass User Account Control

1
T1088

Scheduled Task

1
T1053

Defense Evasion

Modify Registry

6
T1112

Bypass User Account Control

1
T1088

Disabling Security Tools

1
T1089

Impair Defenses

1
T1562

File Permissions Modification

1
T1222

Discovery

Query Registry

2
T1012

System Information Discovery

4
T1082

Impact

Service Stop

1
T1489

Tasks