Analysis

  • max time kernel
    121s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28-07-2024 15:16

General

  • Target

    1d686b05f745875e28939abe357baedd169b59f5a0d88.exe

  • Size

    3.1MB

  • MD5

    e3e1f7fa42dd68f410bb885f0aefe5e3

  • SHA1

    d51edc519d86a11e6533cd4cac8f190dd3f7d4bb

  • SHA256

    1d686b05f745875e28939abe357baedd169b59f5a0d8825b602fd803a6303ba3

  • SHA512

    92ac0379074366a4dbb9235d8c61935be6d8086629611dbcdecdaf680a0a8636f7810d4f6394dbdee5b1e463842284ab9855534da4627677965557e8eb609aa3

  • SSDEEP

    49152:6v5t62XlaSFNWPjljiFa2RoUYIHSz3farvLoGdRbTHHB72eh2NT:6vT62XlaSFNWPjljiFXRoUYI+38B

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

193.42.11.9:4329

Mutex

4c2abd13-f813-4493-8701-1c7115caee61

Attributes
  • encryption_key

    665C8B508EC328B12F8F1A2A20662BF0DBA9F069

  • install_name

    edge.exe

  • log_directory

    Logs

  • reconnect_delay

    1000

  • startup_key

    Chrome

  • subdirectory

    browser

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 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 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\1d686b05f745875e28939abe357baedd169b59f5a0d88.exe
    "C:\Users\Admin\AppData\Local\Temp\1d686b05f745875e28939abe357baedd169b59f5a0d88.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4100
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Chrome" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\browser\edge.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:1320
    • C:\Users\Admin\AppData\Roaming\browser\edge.exe
      "C:\Users\Admin\AppData\Roaming\browser\edge.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2980
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Chrome" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\browser\edge.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3440

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\browser\edge.exe

    Filesize

    3.1MB

    MD5

    e3e1f7fa42dd68f410bb885f0aefe5e3

    SHA1

    d51edc519d86a11e6533cd4cac8f190dd3f7d4bb

    SHA256

    1d686b05f745875e28939abe357baedd169b59f5a0d8825b602fd803a6303ba3

    SHA512

    92ac0379074366a4dbb9235d8c61935be6d8086629611dbcdecdaf680a0a8636f7810d4f6394dbdee5b1e463842284ab9855534da4627677965557e8eb609aa3

  • memory/2980-10-0x00007FF9EC0D0000-0x00007FF9ECB91000-memory.dmp

    Filesize

    10.8MB

  • memory/2980-8-0x00007FF9EC0D0000-0x00007FF9ECB91000-memory.dmp

    Filesize

    10.8MB

  • memory/2980-11-0x000000001C540000-0x000000001C590000-memory.dmp

    Filesize

    320KB

  • memory/2980-12-0x000000001C650000-0x000000001C702000-memory.dmp

    Filesize

    712KB

  • memory/2980-15-0x000000001C5F0000-0x000000001C602000-memory.dmp

    Filesize

    72KB

  • memory/2980-16-0x000000001CD50000-0x000000001CD8C000-memory.dmp

    Filesize

    240KB

  • memory/2980-17-0x00007FF9EC0D0000-0x00007FF9ECB91000-memory.dmp

    Filesize

    10.8MB

  • memory/2980-18-0x00007FF9EC0D0000-0x00007FF9ECB91000-memory.dmp

    Filesize

    10.8MB

  • memory/4100-2-0x00007FF9EC0D0000-0x00007FF9ECB91000-memory.dmp

    Filesize

    10.8MB

  • memory/4100-1-0x00000000000B0000-0x00000000003D4000-memory.dmp

    Filesize

    3.1MB

  • memory/4100-9-0x00007FF9EC0D0000-0x00007FF9ECB91000-memory.dmp

    Filesize

    10.8MB

  • memory/4100-0-0x00007FF9EC0D3000-0x00007FF9EC0D5000-memory.dmp

    Filesize

    8KB