Overview

overview

10

Static

static

10

AsyncClient.exe

windows10-2004-x64

10

AsyncClient.exe

windows10-ltsc_2021-x64

10

AsyncClient.exe

windows11-21h2-x64

10

AsyncClient.exe

windows11-ltsc_2024-x64

10

Sharing

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General

  • Target
    AsyncClient.exe
  • Size 111KB
  • Sample261110-q6e4eafh25
  • SHA256 44852687ed9e894ca39b74671bcf46c28f5f4d5d0067346c8740b0a1813bf6b5
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
asyncrattele@vietnamreportadwarediscoveryexecutionpersistenceratspyware

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Tele@VietNamReport

Mutex

  • Pz8WnOMCcTmp

Attributes
aes.plain

Extracted

Language

  • ps1

Deobfuscated
Source
URLs
  • ps1.dropper

    http://lazyblog.cc/load.ps1

Targets

    • Target
      AsyncClient.exe
    • Size 111KB
    • SHA256 44852687ed9e894ca39b74671bcf46c28f5f4d5d0067346c8740b0a1813bf6b5
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    adwaretele@vietnamreportdiscoveryexecutionasyncratpersistenceratspyware

    • Family: AsyncRat

      AsyncRAT is designed to remotely monitor and control other computers written in C#.

      ratasyncrat

    • Modifies WinLogon for persistence

      persistence

    • Badlisted process makes network request

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

    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

      execution

    • Event Triggered Execution: Image File Execution Options Injection

      persistence

    • Checks computer location settings

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

    • Registers new Windows logon scripts automatically executed at logon.

      persistence

    • Adds Run key to start application

      persistence
    behavioral1behavioral2behavioral3behavioral4

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

2
T1059

PowerShell

1
T1059.001

Windows Command Shell

1
T1059.003

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Persistence

Boot or Logon Autostart Execution

2
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Winlogon Helper DLL

1
T1547.004

Boot or Logon Initialization Scripts

1
T1037

Logon Script (Windows)

1
T1037.001

Event Triggered Execution

1
T1546

Image File Execution Options Injection

1
T1546.012

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

2
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Winlogon Helper DLL

1
T1547.004

Boot or Logon Initialization Scripts

1
T1037

Logon Script (Windows)

1
T1037.001

Event Triggered Execution

1
T1546

Image File Execution Options Injection

1
T1546.012

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Defense Evasion

Modify Registry

3
T1112

Credential Access

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

System Network Configuration Discovery

1
T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks