Analysis

  • max time kernel
    282s
  • max time network
    301s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18-04-2024 14:18

General

  • Target

    aa.exe

  • Size

    3.1MB

  • MD5

    a1b18584a5906f5be41db7dd83325caa

  • SHA1

    749e349a70fb0a2778900fceb15ff7f3ed033196

  • SHA256

    ef2c6cf5a0ba1b81ab22164b7820f49761de4f6feb8fa4e5c64a1bfad369cc74

  • SHA512

    037e7b94ccea547a113304aa73fb940401c18a8e1d3df5681a191b0f9292769419f48bf8fe1f6f69534f320f34fabac638735d2e3ea2ff12039518193dca4ede

  • SSDEEP

    49152:Wv7I22SsaNYfdPBldt698dBcjHqHfkfXvjjLoGlvTHHB72eh2NT:WvE22SsaNYfdPBldt6+dBcjHLfj

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.254.152:4782

180.190.63.111:8080

Mutex

37c3d2aa-6a36-4ee8-a4be-f1c3187fbd03

Attributes
  • encryption_key

    E9EE5B51F341491A9CE8837BE89BB18191B86C1E

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    python

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 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.

Processes

  • C:\Users\Admin\AppData\Local\Temp\aa.exe
    "C:\Users\Admin\AppData\Local\Temp\aa.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3364
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "python" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2320
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3596
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "python" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:1112
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:1700
    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4132 --field-trial-handle=2692,i,8678872182442199182,12502579059484928042,262144 --variations-seed-version /prefetch:8
      1⤵
        PID:4784
      • C:\Users\Admin\AppData\Local\Temp\aa.exe
        "C:\Users\Admin\AppData\Local\Temp\aa.exe"
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3528

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\aa.exe.log

        Filesize

        1KB

        MD5

        baf55b95da4a601229647f25dad12878

        SHA1

        abc16954ebfd213733c4493fc1910164d825cac8

        SHA256

        ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

        SHA512

        24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

      • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

        Filesize

        3.1MB

        MD5

        a1b18584a5906f5be41db7dd83325caa

        SHA1

        749e349a70fb0a2778900fceb15ff7f3ed033196

        SHA256

        ef2c6cf5a0ba1b81ab22164b7820f49761de4f6feb8fa4e5c64a1bfad369cc74

        SHA512

        037e7b94ccea547a113304aa73fb940401c18a8e1d3df5681a191b0f9292769419f48bf8fe1f6f69534f320f34fabac638735d2e3ea2ff12039518193dca4ede

      • memory/3364-9-0x00007FF8A2360000-0x00007FF8A2E21000-memory.dmp

        Filesize

        10.8MB

      • memory/3364-1-0x00007FF8A2360000-0x00007FF8A2E21000-memory.dmp

        Filesize

        10.8MB

      • memory/3364-0-0x0000000000200000-0x0000000000524000-memory.dmp

        Filesize

        3.1MB

      • memory/3364-2-0x000000001B3B0000-0x000000001B3C0000-memory.dmp

        Filesize

        64KB

      • memory/3528-23-0x00007FF8A2360000-0x00007FF8A2E21000-memory.dmp

        Filesize

        10.8MB

      • memory/3528-22-0x000000001BAA0000-0x000000001BAB0000-memory.dmp

        Filesize

        64KB

      • memory/3528-21-0x00007FF8A2360000-0x00007FF8A2E21000-memory.dmp

        Filesize

        10.8MB

      • memory/3596-11-0x000000001B690000-0x000000001B6A0000-memory.dmp

        Filesize

        64KB

      • memory/3596-16-0x00007FF8A2360000-0x00007FF8A2E21000-memory.dmp

        Filesize

        10.8MB

      • memory/3596-17-0x000000001B690000-0x000000001B6A0000-memory.dmp

        Filesize

        64KB

      • memory/3596-14-0x000000001CFD0000-0x000000001D4F8000-memory.dmp

        Filesize

        5.2MB

      • memory/3596-13-0x000000001C7E0000-0x000000001C892000-memory.dmp

        Filesize

        712KB

      • memory/3596-12-0x000000001C6D0000-0x000000001C720000-memory.dmp

        Filesize

        320KB

      • memory/3596-10-0x00007FF8A2360000-0x00007FF8A2E21000-memory.dmp

        Filesize

        10.8MB