Analysis

  • max time kernel
    1040s
  • max time network
    441s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-12-2024 16:37

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 desktop.ini file(s) 1 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 25 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:824
    • C:\Users\Admin\AppData\Local\Temp\4PTSQ6cMKlwb.exe
      "C:\Users\Admin\AppData\Local\Temp\4PTSQ6cMKlwb.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      PID:1012
    • C:\Windows\System32\shutdown.exe
      "C:\Windows\System32\shutdown.exe" /s /t 0
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2432
  • C:\Windows\system32\AUDIODG.EXE
    C:\Windows\system32\AUDIODG.EXE 0x240 0x32c
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4440
  • C:\Windows\system32\LogonUI.exe
    "LogonUI.exe" /flags:0x4 /state0:0xa38d1855 /state1:0x41c64e6d
    1⤵
    • Drops desktop.ini file(s)
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    PID:3760

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\ProgramData\Microsoft\Windows\SystemData\S-1-5-21-2878641211-696417878-3864914810-1000\ReadOnly\LockScreen_O\LockScreen___1280_0720_notdimmed.jpg

    Filesize

    469KB

    MD5

    61d84edafcdf46148bc20db932ad3f34

    SHA1

    9285d6a184fcc3de1f4c70058253cf60036c0d72

    SHA256

    2f2931524c422a05818b7cddd65716368b87ef26a1ab1963c7fd9198e1986aee

    SHA512

    d75f04ef3ef6f722cc31ed8678778d2c8e9c79f2f443958bf68ca90a62b949d62557a6e1e75a7722127f996b20e625302ed8f6ce2c576f8e7b7c83867e27a334

  • C:\Users\Admin\AppData\Local\Temp\4PTSQ6cMKlwb.exe

    Filesize

    854KB

    MD5

    5fdbb633c00c6ae9a7f850236e0eb4c4

    SHA1

    3779b3e58e64b7045abd0ab8764918285b2e24d4

    SHA256

    ec2fc127825e04f42d45c436cf7ee484aac78bdb94b4ea4d077d6b7c88379037

    SHA512

    710ea49f9a1aea061c5c887d6025da86be6ce0cbd40a42c71c8f1c78438ffdbbbe34ed4b8853f1e3468e3ae3e629ef147b271dbceac0b83542ece08dfcd12e61

  • memory/824-33-0x00007FFD651D0000-0x00007FFD65C91000-memory.dmp

    Filesize

    10.8MB

  • memory/824-1-0x0000000000850000-0x0000000000B74000-memory.dmp

    Filesize

    3.1MB

  • memory/824-2-0x00007FFD651D0000-0x00007FFD65C91000-memory.dmp

    Filesize

    10.8MB

  • memory/824-3-0x000000001C070000-0x000000001C0C0000-memory.dmp

    Filesize

    320KB

  • memory/824-4-0x000000001C180000-0x000000001C232000-memory.dmp

    Filesize

    712KB

  • memory/824-7-0x000000001C0C0000-0x000000001C0D2000-memory.dmp

    Filesize

    72KB

  • memory/824-8-0x000000001C120000-0x000000001C15C000-memory.dmp

    Filesize

    240KB

  • memory/824-9-0x00007FFD651D3000-0x00007FFD651D5000-memory.dmp

    Filesize

    8KB

  • memory/824-10-0x00007FFD651D0000-0x00007FFD65C91000-memory.dmp

    Filesize

    10.8MB

  • memory/824-0-0x00007FFD651D3000-0x00007FFD651D5000-memory.dmp

    Filesize

    8KB

  • memory/1012-22-0x000000007468E000-0x000000007468F000-memory.dmp

    Filesize

    4KB

  • memory/1012-25-0x0000000005590000-0x0000000005622000-memory.dmp

    Filesize

    584KB

  • memory/1012-26-0x0000000005550000-0x000000000555A000-memory.dmp

    Filesize

    40KB

  • memory/1012-27-0x0000000074680000-0x0000000074E30000-memory.dmp

    Filesize

    7.7MB

  • memory/1012-28-0x000000007468E000-0x000000007468F000-memory.dmp

    Filesize

    4KB

  • memory/1012-29-0x0000000074680000-0x0000000074E30000-memory.dmp

    Filesize

    7.7MB

  • memory/1012-24-0x0000000005B40000-0x00000000060E4000-memory.dmp

    Filesize

    5.6MB

  • memory/1012-23-0x0000000000A90000-0x0000000000B6C000-memory.dmp

    Filesize

    880KB