Overview

overview

10

Static

static

10

AsyncClient.exe

windows10-2004-x64

10

AsyncClient.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    29/05/2026, 17:28

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General

  • Target
    AsyncClient.exe
  • Size 45KB
  • Sample260529-v2df8sa18w
  • SHA256 c59f9da72a678a7a5ec8ded96f868f1773567cdf0d2cf4b64c1f354d4cc66af4
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultdiscoveryasyncratrat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • xn--efax-3k9f8980a.jp.net:6606

  • xn--efax-3k9f8980a.jp.net:7707

  • xn--efax-3k9f8980a.jp.net:8808

  • xn--efax-3k9f8980a.jp.net:443

  • xn--efax-3k9f8980a.jp.net:80

  • xn--efax-3k9f8980a.jp.net:8844

  • xn--efax-3k9f8980a.jp.net:22

  • xn--efax-3k9f8980a.jp.net:53

Mutex

  • FtTRmAL1FxCo

Attributes
  • delay

    3

  • install

    false

  • install_folder

    %AppData%

aes.plain

Signatures

  • Family: AsyncRat

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

    ratasyncrat
  • Unexpected DNS network traffic destination 3 IoCs

    Network traffic to other servers than the configured DNS servers was detected on the DNS port.

  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery

Processes

  • C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
    "C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
    1⤵
    • Unexpected DNS network traffic destination
    • System Location Discovery: System Language Discovery
    PID:4432

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        memory/4432-0-0x0000000000660000-0x0000000000672000-memory.dmp
        Download

        memory/4432-1-0x0000000005020000-0x0000000005030000-memory.dmp
        Download

        memory/4432-2-0x0000000005020000-0x0000000005030000-memory.dmp
        Download