Analysis

  • max time kernel
    1040s
  • max time network
    433s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241211-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241211-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    24-12-2024 16:38

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    2df7f55c626ea8077ef2cc5ffd32dc38

  • SHA1

    93131a8d6128ea827f1f31ada4391f94bbc1dd06

  • SHA256

    58f7dda2165a44ddad0d441ba356a0626d1ad619d766a58008320ec5936cdb94

  • SHA512

    362bfea6ae2127df5da06904407286c0ed49846ec230ae149a46a4cdcdb101987963a406427283d409957427bdc57a77c3ac90f567b3d00ad561f025f10912cc

  • SSDEEP

    49152:ZvZI22SsaNYfdPBldt698dBcjHVi/2BxmgoGd5UTHHB72eh2NT:Zva22SsaNYfdPBldt6+dBcjHU/O

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

85.209.133.15:111

Mutex

95ddd19c-037b-4e62-8c64-298b31d663b8

Attributes
  • encryption_key

    43DE31297B50FED5B1E6867AE89B621C68EF71E2

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Drops file in Windows directory 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 1 IoCs

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

  • Modifies data under HKEY_USERS 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of FindShellTrayWindow 4 IoCs
  • Suspicious use of SendNotifyMessage 4 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:4852
    • C:\Users\Admin\AppData\Local\Temp\rd4AHHHj9XwZ.exe
      "C:\Users\Admin\AppData\Local\Temp\rd4AHHHj9XwZ.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:4776
    • C:\Windows\System32\shutdown.exe
      "C:\Windows\System32\shutdown.exe" /s /t 0
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1108
  • C:\Windows\system32\AUDIODG.EXE
    C:\Windows\system32\AUDIODG.EXE 0x500 0x508
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2572
  • C:\Windows\system32\LogonUI.exe
    "LogonUI.exe" /flags:0x4 /state0:0xa3a14855 /state1:0x41c64e6d
    1⤵
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    PID:992

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\rd4AHHHj9XwZ.exe

    Filesize

    854KB

    MD5

    5fdbb633c00c6ae9a7f850236e0eb4c4

    SHA1

    3779b3e58e64b7045abd0ab8764918285b2e24d4

    SHA256

    ec2fc127825e04f42d45c436cf7ee484aac78bdb94b4ea4d077d6b7c88379037

    SHA512

    710ea49f9a1aea061c5c887d6025da86be6ce0cbd40a42c71c8f1c78438ffdbbbe34ed4b8853f1e3468e3ae3e629ef147b271dbceac0b83542ece08dfcd12e61

  • memory/4776-32-0x0000000075260000-0x0000000075A11000-memory.dmp

    Filesize

    7.7MB

  • memory/4776-31-0x000000007526E000-0x000000007526F000-memory.dmp

    Filesize

    4KB

  • memory/4776-29-0x0000000075260000-0x0000000075A11000-memory.dmp

    Filesize

    7.7MB

  • memory/4776-30-0x00000000051C0000-0x00000000051CA000-memory.dmp

    Filesize

    40KB

  • memory/4776-28-0x0000000005250000-0x00000000052E2000-memory.dmp

    Filesize

    584KB

  • memory/4776-27-0x0000000005800000-0x0000000005DA6000-memory.dmp

    Filesize

    5.6MB

  • memory/4776-26-0x0000000000710000-0x00000000007EC000-memory.dmp

    Filesize

    880KB

  • memory/4776-25-0x000000007526E000-0x000000007526F000-memory.dmp

    Filesize

    4KB

  • memory/4852-4-0x000000001CC20000-0x000000001CCD2000-memory.dmp

    Filesize

    712KB

  • memory/4852-10-0x00007FFAE9400000-0x00007FFAE9EC2000-memory.dmp

    Filesize

    10.8MB

  • memory/4852-9-0x00007FFAE9403000-0x00007FFAE9405000-memory.dmp

    Filesize

    8KB

  • memory/4852-8-0x000000001CBC0000-0x000000001CBFC000-memory.dmp

    Filesize

    240KB

  • memory/4852-7-0x000000001CB60000-0x000000001CB72000-memory.dmp

    Filesize

    72KB

  • memory/4852-0-0x00007FFAE9403000-0x00007FFAE9405000-memory.dmp

    Filesize

    8KB

  • memory/4852-3-0x000000001CB10000-0x000000001CB60000-memory.dmp

    Filesize

    320KB

  • memory/4852-2-0x00007FFAE9400000-0x00007FFAE9EC2000-memory.dmp

    Filesize

    10.8MB

  • memory/4852-1-0x00000000007F0000-0x0000000000B14000-memory.dmp

    Filesize

    3.1MB

  • memory/4852-36-0x00007FFAE9400000-0x00007FFAE9EC2000-memory.dmp

    Filesize

    10.8MB