Overview

overview

10

Static

static

3

CrystalSer...al.exe

windows11-21h2-x64

10

Sharing

Copy URL Twitter E-mail

General

  • Target
    CrystalServersideExternal.exe
  • Size 1.1MB
  • Sample261011-vcja7adf89
  • SHA256 06e6e9a6a74eac545bd30eb73eb46cf656e43f019bd903199d35b8d438f43127
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defense_evasiondiscoveryexecutionpersistenceprivilege_escalation

Malware Config

Targets

    • Target
      CrystalServersideExternal.exe
    • Size 1.1MB
    • SHA256 06e6e9a6a74eac545bd30eb73eb46cf656e43f019bd903199d35b8d438f43127
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    defense_evasiondiscoveryexecutionpersistenceprivilege_escalation

    • Modifies WinLogon for persistence

      persistence

    • Looks for VirtualBox Guest Additions in registry

      defense_evasion

    • Event Triggered Execution: AppInit DLLs

      Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes.

      persistenceprivilege_escalation

    • Looks for VMWare Tools registry key

      defense_evasion

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Executes dropped EXE

    • Loads dropped DLL

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

      discovery

    • Maps connected drives based on registry

      Disk information is often read in order to detect sandboxing environments.

    • Drops file in System32 directory

    behavioral1

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

Windows Command Shell

1
T1059.003

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Persistence

Boot or Logon Autostart Execution

1
T1547

Winlogon Helper DLL

1
T1547.004

Event Triggered Execution

1
T1546

AppInit DLLs

1
T1546.010

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Winlogon Helper DLL

1
T1547.004

Event Triggered Execution

1
T1546

AppInit DLLs

1
T1546.010

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Defense Evasion

Modify Registry

1
T1112

Virtualization/Sandbox Evasion

2
T1497

Credential Access

Discovery

Peripheral Device Discovery

1
T1120

Query Registry

5
T1012

System Information Discovery

3
T1082

System Network Configuration Discovery

2
T1016

Internet Connection Discovery

1
T1016.001

Virtualization/Sandbox Evasion

2
T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks