Overview

overview

10

Static

static

10

AsyncClient.exe

windows7-x64

10

AsyncClient.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-12-2024 10:30

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General

  • Target

    AsyncClient.exe

  • Size

    47KB

  • MD5

    da0c2ab9e92a4d36b177ae380e91feda

  • SHA1

    44fb185950925ca2fcb469fbedaceee0a451cbca

  • SHA256

    c84a91d4261563b4171103a1d72a3f86f48ec2eaca6e43d7f217bdcbc877124d

  • SHA512

    0fc9a2f7cd1924578ed0840205162c19bcc67ad602321461d74d817344436f778d6fe54cc91f795cbed6decd65dc4d8bbc17ef969af7dd5feafec9bd7fcc1e7e

  • SSDEEP

    768:ku/dRTUo0HQbWUnmjSmo2qMOdvbvAaQ9+EUMpPPI4/AWXXz0bjx+IBE8IIC6sGBo:ku/dRTUPE2ovbVWSQAWXX4bjgF8AIdgx

Score
10/10
asyncratdefaultdiscoveryexecutionpersistencerat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

82.64.156.123:80

Mutex

9mzImB3NUR0Q

Attributes
  • delay

    3

  • install

    false

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

    ratasyncrat
  • Asyncrat family
    asyncrat
  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    persistence
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 3 IoCs
  • Enumerates connected drives 3 TTPs 2 IoCs

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

  • Looks up external IP address via web service 1 IoCs

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

  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Start PowerShell.

    execution
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

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

    discovery
  • Checks SCSI registry key(s) 3 TTPs 22 IoCs

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

  • Modifies Internet Explorer settings 1 TTPs 2 IoCs
    adwarespyware
  • Modifies registry class 64 IoCs
  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 36 IoCs
  • Suspicious use of FindShellTrayWindow 51 IoCs
  • Suspicious use of SendNotifyMessage 23 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 22 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence
  • Uses Volume Shadow Copy WMI provider

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
    "C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2204
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\tykrjf.exe"' & exit
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:5064
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\tykrjf.exe"'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2388
        • C:\Users\Admin\AppData\Local\Temp\tykrjf.exe
          "C:\Users\Admin\AppData\Local\Temp\tykrjf.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1708
          • C:\Windows\explorer.exe
            "C:\Windows\explorer.exe"
            5⤵
            • Boot or Logon Autostart Execution: Active Setup
            • Enumerates connected drives
            • Checks SCSI registry key(s)
            • Modifies registry class
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of FindShellTrayWindow
            • Suspicious use of SendNotifyMessage
            PID:2124
          • C:\Users\Admin\AppData\Local\Temp\tykrjf.exe
            "C:\Users\Admin\AppData\Local\Temp\tykrjf.exe"
            5⤵
            • Executes dropped EXE
            PID:1960
          • C:\Users\Admin\AppData\Local\Temp\tykrjf.exe
            "C:\Users\Admin\AppData\Local\Temp\tykrjf.exe"
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious use of AdjustPrivilegeToken
            PID:3560
  • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
    "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:1692
  • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
    "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
    1⤵
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:3564

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.Search_cw5n1h2txyewy\LocalState\DeviceSearchCache\AppCache133785594323629192.txt
    Filesize

    74KB

    MD5

    6b1cdf5f8e996e4ff5886fc4f86133b8

    SHA1

    48ea50c6c34359e68876711c5569ae79342dc8cf

    SHA256

    f1c9476d0a6145d901d2112916aca4a512b60b46152f3789bb1472cb5edcbef4

    SHA512

    5ce2cdd0249d13f5c9cf54fb5a214b1d6db9e051db1fa435f80b9148750766142439f00a9aacfc04ec1f6db19f868ea7f455bb45bfa9d357f5c33a686d0c2408

    Download Submit

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_oguicyba.5di.ps1
    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    Download Submit

  • C:\Users\Admin\AppData\Local\Temp\tykrjf.exe
    Filesize

    701KB

    MD5

    5890798f97f9144206499433a5db3011

    SHA1

    1c9c488123a81bf8d2216ac57c089e056f899433

    SHA256

    69be5428a0e939a5bf4453b34aad1a86791ab75411b6a339d727197f82bc8411

    SHA512

    964f340060a67abed11d06ac40cb8cb2577f985e8815cc12f306e37a716792ae8edac02645d0cddeea5d81f72ef402363c909b6f510eb2a37c76f1cf56caada9

    Download Submit

  • memory/1708-42-0x0000000004FF0000-0x0000000004FFA000-memory.dmp

    Filesize

    40KB

    Download

  • memory/1708-41-0x0000000005020000-0x00000000050B2000-memory.dmp

    Filesize

    584KB

    Download

  • memory/1708-40-0x00000000003E0000-0x0000000000496000-memory.dmp

    Filesize

    728KB

    Download

  • memory/2124-46-0x00000000033B0000-0x00000000033B1000-memory.dmp

    Filesize

    4KB

    Download

  • memory/2204-12-0x00000000744FE000-0x00000000744FF000-memory.dmp

    Filesize

    4KB

    Download

  • memory/2204-8-0x0000000006C30000-0x0000000006CA6000-memory.dmp

    Filesize

    472KB

    Download

  • memory/2204-0-0x00000000744FE000-0x00000000744FF000-memory.dmp

    Filesize

    4KB

    Download

  • memory/2204-1-0x0000000000AE0000-0x0000000000AF2000-memory.dmp

    Filesize

    72KB

    Download

  • memory/2204-2-0x00000000744F0000-0x0000000074CA0000-memory.dmp

    Filesize

    7.7MB

    Download

  • memory/2204-44-0x00000000744F0000-0x0000000074CA0000-memory.dmp

    Filesize

    7.7MB

    Download

  • memory/2204-5-0x0000000005C30000-0x0000000005CCC000-memory.dmp

    Filesize

    624KB

    Download

  • memory/2204-6-0x0000000006280000-0x0000000006824000-memory.dmp

    Filesize

    5.6MB

    Download

  • memory/2204-10-0x0000000006D10000-0x0000000006D2E000-memory.dmp

    Filesize

    120KB

    Download

  • memory/2204-9-0x0000000006BB0000-0x0000000006C12000-memory.dmp

    Filesize

    392KB

    Download

  • memory/2204-7-0x0000000005D40000-0x0000000005DA6000-memory.dmp

    Filesize

    408KB

    Download

  • memory/2388-18-0x00000000061F0000-0x0000000006212000-memory.dmp

    Filesize

    136KB

    Download

  • memory/2388-17-0x00000000744F0000-0x0000000074CA0000-memory.dmp

    Filesize

    7.7MB

    Download

  • memory/2388-31-0x0000000006A10000-0x0000000006A5C000-memory.dmp

    Filesize

    304KB

    Download

  • memory/2388-32-0x0000000007B80000-0x0000000007C16000-memory.dmp

    Filesize

    600KB

    Download

  • memory/2388-33-0x0000000006E50000-0x0000000006E6A000-memory.dmp

    Filesize

    104KB

    Download

  • memory/2388-34-0x0000000006EA0000-0x0000000006EC2000-memory.dmp

    Filesize

    136KB

    Download

  • memory/2388-26-0x0000000006370000-0x00000000066C4000-memory.dmp

    Filesize

    3.3MB

    Download

  • memory/2388-39-0x00000000744F0000-0x0000000074CA0000-memory.dmp

    Filesize

    7.7MB

    Download

  • memory/2388-21-0x0000000006290000-0x00000000062F6000-memory.dmp

    Filesize

    408KB

    Download

  • memory/2388-30-0x0000000006980000-0x000000000699E000-memory.dmp

    Filesize

    120KB

    Download

  • memory/2388-15-0x00000000744F0000-0x0000000074CA0000-memory.dmp

    Filesize

    7.7MB

    Download

  • memory/2388-16-0x0000000005B00000-0x0000000006128000-memory.dmp

    Filesize

    6.2MB

    Download

  • memory/2388-14-0x00000000744F0000-0x0000000074CA0000-memory.dmp

    Filesize

    7.7MB

    Download

  • memory/2388-13-0x00000000053C0000-0x00000000053F6000-memory.dmp

    Filesize

    216KB

    Download

  • memory/3560-165-0x0000000000400000-0x0000000000440000-memory.dmp

    Filesize

    256KB

    Download

  • memory/3564-47-0x0000021D7E5C0000-0x0000021D7E6C0000-memory.dmp

    Filesize

    1024KB

    Download

  • memory/3564-52-0x0000021D7F5F0000-0x0000021D7F610000-memory.dmp

    Filesize

    128KB

    Download

  • memory/3564-77-0x0000021D7F9C0000-0x0000021D7F9E0000-memory.dmp

    Filesize

    128KB

    Download

  • memory/3564-63-0x0000021D7F5B0000-0x0000021D7F5D0000-memory.dmp

    Filesize

    128KB

    Download

  • memory/3564-49-0x0000021D7E5C0000-0x0000021D7E6C0000-memory.dmp

    Filesize

    1024KB

    Download