Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240611-en
  • resource tags

    arch:x64arch:x86image:win11-20240611-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    20-06-2024 18:40

General

  • Target

    Dllhost.exe

  • Size

    47KB

  • MD5

    87bc62c9412b158944dcd660b65c1fc9

  • SHA1

    bf2541d0537f58440738c9b6a8f43b3da95588cc

  • SHA256

    b324d1b19e6c6eff0efb46fbee13d56a71ecdf1f3891a30f3435ba671adf07f0

  • SHA512

    9d6b2c0b8e1768307b4a7f5ca4b6b6f5720b1882271ba666ff1e24b8560b77c47b478122abec5b6c660eb7acb74ec46818dc2ba373fdad999b1623e170ee82fd

  • SSDEEP

    768:AuwpFTAY3IQWUe9jqmo2qL8w92alD/NOaPIEbc8ZY40bNWVXgfOpcob01BDZjx:AuwpFTA4/2OtlrNOjEIwYzbN6XgWidbH

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

4.tcp.eu.ngrok:17215

Mutex

KUvjRMJgonFa

Attributes
  • delay

    3

  • install

    true

  • install_file

    dllhost.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

  • Async RAT payload 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Delays execution with timeout.exe 1 IoCs
  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 19 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Dllhost.exe
    "C:\Users\Admin\AppData\Local\Temp\Dllhost.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2436
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "dllhost" /tr '"C:\Users\Admin\AppData\Roaming\dllhost.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3900
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "dllhost" /tr '"C:\Users\Admin\AppData\Roaming\dllhost.exe"'
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1940
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8B48.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1592
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:2112
      • C:\Users\Admin\AppData\Roaming\dllhost.exe
        "C:\Users\Admin\AppData\Roaming\dllhost.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:976
  • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
    "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:3164

Network

MITRE ATT&CK Matrix ATT&CK v13

Execution

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Persistence

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Discovery

System Information Discovery

1
T1082

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\dllhost.exe.log
    Filesize

    614B

    MD5

    fece27917067365b631bc648c66fe066

    SHA1

    f12c84b1c2b1296091ee06e8654c7065d22cbb44

    SHA256

    93e03593374ce40bc5d4c57832ebe96d3a6a532766eb6385f568a0383b426d10

    SHA512

    9b502a6d46b82ccc2c8aff650de664299f0131a82480eb9cec701546e9cd7f1647c0665014035c19da80a6cab267cf896645af827ecdd95287a70994c1ecb662

  • C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat
    Filesize

    10KB

    MD5

    9a7af7f1f08f7de9da3ba647286ee5a6

    SHA1

    d7a23961ba5f8c4242a03f20686ff516c2ae432c

    SHA256

    dddc3d322b46ec53927c26326a4f4d573dec131fbe668450f984c91c3104a08b

    SHA512

    64b0d94e68aa2d0ee9d02f170de6989f5255c5c57d05dffbf4dbbe012dae43a6f4dbd59c6a85fd2621fb84ae7f4cdf486a089b90e3e6c4fce1b152ba5aa6ba58

  • C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat
    Filesize

    10KB

    MD5

    35745802ec2865acb4c60e651e5a8620

    SHA1

    f10c746a71c2741790aa3f5160ea7d9be1a1920a

    SHA256

    ef386e977e9fcfc811f2710d0d630e23e2278cf9811770da0c2f10f3965b7a63

    SHA512

    0031f739cafa1089dc655a3509bc215fc900c20734507a1b0b69f1ad1567fb2fe4af725360cf952a4689e89973bbd59a53ea6ff8bd6c4c67b9e732f66f14a42f

  • C:\Users\Admin\AppData\Local\Temp\tmp8B48.tmp.bat
    Filesize

    151B

    MD5

    8d2a88f6de9fdca789c4843f2bd1aa99

    SHA1

    9274d676172c76fad9ffe1720574acc7309275f2

    SHA256

    c8e7887b91d832fc0aeed742cdb2e336b05d9a43f86e411d77e5e80ceaaf4f6a

    SHA512

    a6e6f2ad2e63d3636d22deaf87ff16c1e113358a7007bb72b39c82d7ae5cd44bba7fa0c44e024e8d1f439151e371172bad3c87eb920724d9b7542d3e54e442a8

  • C:\Users\Admin\AppData\Roaming\dllhost.exe
    Filesize

    47KB

    MD5

    87bc62c9412b158944dcd660b65c1fc9

    SHA1

    bf2541d0537f58440738c9b6a8f43b3da95588cc

    SHA256

    b324d1b19e6c6eff0efb46fbee13d56a71ecdf1f3891a30f3435ba671adf07f0

    SHA512

    9d6b2c0b8e1768307b4a7f5ca4b6b6f5720b1882271ba666ff1e24b8560b77c47b478122abec5b6c660eb7acb74ec46818dc2ba373fdad999b1623e170ee82fd

  • memory/976-15-0x0000000075140000-0x00000000758F1000-memory.dmp
    Filesize

    7.7MB

  • memory/976-36-0x0000000075140000-0x00000000758F1000-memory.dmp
    Filesize

    7.7MB

  • memory/2436-9-0x00000000751F0000-0x00000000759A1000-memory.dmp
    Filesize

    7.7MB

  • memory/2436-4-0x0000000005780000-0x000000000581C000-memory.dmp
    Filesize

    624KB

  • memory/2436-3-0x00000000052E0000-0x0000000005346000-memory.dmp
    Filesize

    408KB

  • memory/2436-0-0x00000000751FE000-0x00000000751FF000-memory.dmp
    Filesize

    4KB

  • memory/2436-2-0x00000000751F0000-0x00000000759A1000-memory.dmp
    Filesize

    7.7MB

  • memory/2436-1-0x0000000000880000-0x0000000000892000-memory.dmp
    Filesize

    72KB