Overview

overview

8

Static

static

1

Letter_fro...43.vbs

windows10-2004-x64

8

Letter_fro...43.vbs

windows11-ltsc_2024-x64

8

Sharing

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General

  • Target
    Letter_from_Friend_71643.vbs
  • Size 6KB
  • Sample260818-pml7yattht
  • SHA256 fcb822f8b812a7f00ecee17498941964748a1f8bdb6ba5378a830e2246cab779
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
8/10
backdoordefense_evasiondiscoveryexecutionpersistenceprivilege_escalationratrevoked_codesignspywaretrojan

Malware Config

Targets

    • Target
      Letter_from_Friend_71643.vbs
    • Size 6KB
    • SHA256 fcb822f8b812a7f00ecee17498941964748a1f8bdb6ba5378a830e2246cab779
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    8/10
    backdoordiscoveryexecutionpersistenceprivilege_escalationratrevoked_codesigndefense_evasionspywaretrojan

    • Badlisted process makes network request

      Network request originating from process or tool commonly abused by malware.

    • Sets service image path in registry

      This determines the executable launched when a service starts. It can be used to establish persistence.

      persistence

    • Signed with revoked ConnectWise certificate

      Binary is signed using a ConnectWise certificate revoked for key compromise.

      revoked_codesign

    • Checks computer location settings

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

    • ConnectWise ScreenConnect remote access tool

      ConnectWise ScreenConnect is a remote desktop tool that can be used as a backdoor.

      backdoorrat

    • Deletes itself

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

      persistenceprivilege_escalation

    • Executes dropped EXE

    • Loads dropped DLL

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Boot or Logon Autostart Execution: Authentication Package

      Suspicious Windows Authentication Registry Modification.

      persistenceprivilege_escalation

    • Drops file in System32 directory

    • Executes a VBScript file via the Windows Script Host.

      execution
    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

Visual Basic

1
T1059.005

Persistence

Boot or Logon Autostart Execution

2
T1547

Authentication Package

1
T1547.002

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Event Triggered Execution

1
T1546

Component Object Model Hijacking

1
T1546.015

Privilege Escalation

Boot or Logon Autostart Execution

2
T1547

Authentication Package

1
T1547.002

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Event Triggered Execution

1
T1546

Component Object Model Hijacking

1
T1546.015

Defense Evasion

Modify Registry

2
T1112

Subvert Trust Controls

1
T1553

Install Root Certificate

1
T1553.004

Credential Access

Discovery

Peripheral Device Discovery

1
T1120

Query Registry

3
T1012

System Information Discovery

4
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks