Analysis

  • max time kernel
    128s
  • max time network
    137s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    14-12-2024 20:32

General

  • Target

    built.exe

  • Size

    348KB

  • MD5

    fb1057eee229c44ceea060397b9f8ff1

  • SHA1

    0528f64effa73492a54a97535ee1a4e65d0ad023

  • SHA256

    97a83514d72fdb32ff49a7c8526c4a180a5affefc1af9f2abd9c799aa3ac0548

  • SHA512

    899c3e467379c04e32e4ca9868640c3e4a282c40780ebb5be63677d4c2155e5970e37f6e490e45796b7964a8736d24aa50936861236b29e7dfc71b9cc43dd892

  • SSDEEP

    6144:1mSiPqU23zkkEUcadASlBx+bS7VqlvfbbOA30DbJi:coU2fIS11EtbOu0DbJi

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Test

C2

100.115.92.196:8080

100.115.92.196:22

100.115.92.196:3389

Mutex

QSR_MUTEX_B6Q8duJmC3tqQvImXE

Attributes
  • encryption_key

    Fv3xsfvJChgh6yTF3T1x

  • install_name

    win.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Runtime

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

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

  • 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 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\built.exe
    "C:\Users\Admin\AppData\Local\Temp\built.exe"
    1⤵
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:860
    • C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "Windows Runtime" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\built.exe" /rl HIGHEST /f
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:2460
    • C:\Users\Admin\AppData\Roaming\SubDir\win.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\win.exe"
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2756
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Windows Runtime" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\win.exe" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:2648

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • \Users\Admin\AppData\Roaming\SubDir\win.exe

    Filesize

    348KB

    MD5

    fb1057eee229c44ceea060397b9f8ff1

    SHA1

    0528f64effa73492a54a97535ee1a4e65d0ad023

    SHA256

    97a83514d72fdb32ff49a7c8526c4a180a5affefc1af9f2abd9c799aa3ac0548

    SHA512

    899c3e467379c04e32e4ca9868640c3e4a282c40780ebb5be63677d4c2155e5970e37f6e490e45796b7964a8736d24aa50936861236b29e7dfc71b9cc43dd892

  • memory/860-0-0x0000000074C1E000-0x0000000074C1F000-memory.dmp

    Filesize

    4KB

  • memory/860-1-0x0000000001170000-0x00000000011CE000-memory.dmp

    Filesize

    376KB

  • memory/860-2-0x0000000074C10000-0x00000000752FE000-memory.dmp

    Filesize

    6.9MB

  • memory/860-11-0x0000000074C10000-0x00000000752FE000-memory.dmp

    Filesize

    6.9MB

  • memory/2756-10-0x0000000074C10000-0x00000000752FE000-memory.dmp

    Filesize

    6.9MB

  • memory/2756-12-0x0000000000050000-0x00000000000AE000-memory.dmp

    Filesize

    376KB

  • memory/2756-13-0x0000000074C10000-0x00000000752FE000-memory.dmp

    Filesize

    6.9MB

  • memory/2756-15-0x0000000074C10000-0x00000000752FE000-memory.dmp

    Filesize

    6.9MB