Overview

overview

10

Static

static

10

f99edc2be4...8b.exe

windows10-2004-x64

10

f99edc2be4...8b.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    148s
  • max time network
    147s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    03/08/2026, 17:01

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General

  • Target
    f99edc2be4397deae2f0aff143a82cd5ecc96d4be57ca6132026c48b497cb08b.exe
  • Size 45KB
  • Sample260803-vjradatdrg
  • SHA256 f99edc2be4397deae2f0aff143a82cd5ecc96d4be57ca6132026c48b497cb08b
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defaultcommand_and_controldefense_evasiondiscoveryexecutionasyncratpersistencerat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 0.5.8

Botnet

  • Default

C2

  • fimsexvietnam.com:80

  • fimsexvietnam.com:22

  • fimsexvietnam.com:8080

  • fimsexvietnam.com:8880

  • fimsexvietnam.com:2052

  • fimsexvietnam.com:2082

  • fimsexvietnam.com:2086

  • fimsexvietnam.com:2095

  • fimsexvietnam.com:443

  • fimsexvietnam.com:2053

  • fimsexvietnam.com:2083

  • fimsexvietnam.com:2087

  • fimsexvietnam.com:2096

  • fimsexvietnam.com:8443

  • www.fimsexvietnam.com:80

  • www.fimsexvietnam.com:22

  • www.fimsexvietnam.com:8080

  • www.fimsexvietnam.com:8880

  • www.fimsexvietnam.com:2052

  • www.fimsexvietnam.com:2082

Mutex

  • c1ZnU6sEjSKb

Attributes
  • delay

    0

  • install

    true

  • install_file

    fespmon.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • Family: AsyncRat

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

    ratasyncrat
  • Async RAT payload 1 IoCs
    rat
  • Executes dropped EXE 1 IoCs
  • Outbound SSH connection to public host 2 TTPs 4 IoCs

    SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

    command_and_control
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Executes a command shell one-liner 1 TTPs 2 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

    execution
  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

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

    discovery
  • Delays execution with timeout.exe 1 IoCs
    defense_evasion
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistenceexecution
  • Suspicious behavior: EnumeratesProcesses 31 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f99edc2be4397deae2f0aff143a82cd5ecc96d4be57ca6132026c48b497cb08b.exe
    "C:\Users\Admin\AppData\Local\Temp\f99edc2be4397deae2f0aff143a82cd5ecc96d4be57ca6132026c48b497cb08b.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4344
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "fespmon" /tr '"C:\Users\Admin\AppData\Roaming\fespmon.exe"' & exit
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1388
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "fespmon" /tr '"C:\Users\Admin\AppData\Roaming\fespmon.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:5876
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp92A1.tmp.bat""
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:292
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:852
      • C:\Users\Admin\AppData\Roaming\fespmon.exe
        "C:\Users\Admin\AppData\Roaming\fespmon.exe"
        3⤵
          PID:2668
    • C:\Users\Admin\AppData\Roaming\fespmon.exe
      "C:\Users\Admin\AppData\Roaming\fespmon.exe"
      1⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:5700

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          tmp92A1.tmp.bat
          • Path C:\Users\Admin\AppData\Local\Temp\tmp92A1.tmp.bat
          • Size 151B
          • SHA256 265421562c02ce721d323dec95b111b878263a161c58b126c1f10beba94f6c88
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          fespmon.exe
          • Path C:\Users\Admin\AppData\Roaming\fespmon.exe
          • Size 45KB
          • SHA256 f99edc2be4397deae2f0aff143a82cd5ecc96d4be57ca6132026c48b497cb08b
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          memory/4344-0-0x0000000074642000-0x0000000074643000-memory.dmp
          Download

          memory/4344-1-0x00000000006C0000-0x00000000006D2000-memory.dmp
          Download

          memory/4344-2-0x0000000074630000-0x0000000074DEC000-memory.dmp
          Download

          memory/4344-3-0x0000000005240000-0x00000000052DC000-memory.dmp
          Download

          memory/4344-8-0x0000000074630000-0x0000000074DEC000-memory.dmp
          Download

          memory/5700-12-0x0000000074490000-0x0000000074C4C000-memory.dmp
          Download

          memory/5700-14-0x0000000074490000-0x0000000074C4C000-memory.dmp
          Download