Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-08-2024 10:06

General

  • Target

    ia.exe

  • Size

    3.1MB

  • MD5

    5828b4f3710d309100812b3f698a34c2

  • SHA1

    64c5979a98bc2855bdc440d9fc669d5f63cfaa9f

  • SHA256

    19a7fd629bf8badfd4703785c8af9fbb3396689a47d2375274c1fae6629ee24b

  • SHA512

    2888bd591344bf43cb03edc7c70e8a6a9200c17f97df0ea3bb0883a5b0aa62b4464d736e659f7b23a4303b3376e36c302882ff85054982649be9a1ccbca50127

  • SSDEEP

    49152:Pv9t62XlaSFNWPjljiFa2RoUYIWgloUBxZ/oGdQeTHHB72eh2NT:Pv/62XlaSFNWPjljiFXRoUYI/ou

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.184:4782

Mutex

63d17811-7d89-4513-a09e-567135741dc7

Attributes
  • encryption_key

    F3BEC07E3E649D50CEE84302EC0FDD43A47F4E75

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    ia

  • subdirectory

    ia

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 2 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\ia.exe
    "C:\Users\Admin\AppData\Local\Temp\ia.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3424
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "ia" /sc ONLOGON /tr "C:\Windows\system32\ia\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2140
    • C:\Windows\system32\ia\Client.exe
      "C:\Windows\system32\ia\Client.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1644
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "ia" /sc ONLOGON /tr "C:\Windows\system32\ia\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4020

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Windows\System32\ia\Client.exe

    Filesize

    3.1MB

    MD5

    5828b4f3710d309100812b3f698a34c2

    SHA1

    64c5979a98bc2855bdc440d9fc669d5f63cfaa9f

    SHA256

    19a7fd629bf8badfd4703785c8af9fbb3396689a47d2375274c1fae6629ee24b

    SHA512

    2888bd591344bf43cb03edc7c70e8a6a9200c17f97df0ea3bb0883a5b0aa62b4464d736e659f7b23a4303b3376e36c302882ff85054982649be9a1ccbca50127

  • memory/1644-9-0x00007FF90F250000-0x00007FF90FD11000-memory.dmp

    Filesize

    10.8MB

  • memory/1644-11-0x00007FF90F250000-0x00007FF90FD11000-memory.dmp

    Filesize

    10.8MB

  • memory/1644-12-0x000000001BCB0000-0x000000001BD00000-memory.dmp

    Filesize

    320KB

  • memory/1644-13-0x000000001C580000-0x000000001C632000-memory.dmp

    Filesize

    712KB

  • memory/1644-14-0x00007FF90F250000-0x00007FF90FD11000-memory.dmp

    Filesize

    10.8MB

  • memory/3424-0-0x00007FF90F253000-0x00007FF90F255000-memory.dmp

    Filesize

    8KB

  • memory/3424-1-0x0000000000FD0000-0x00000000012F4000-memory.dmp

    Filesize

    3.1MB

  • memory/3424-2-0x00007FF90F250000-0x00007FF90FD11000-memory.dmp

    Filesize

    10.8MB

  • memory/3424-10-0x00007FF90F250000-0x00007FF90FD11000-memory.dmp

    Filesize

    10.8MB