Analysis

  • max time kernel
    34s
  • max time network
    36s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240709-en
  • resource tags

    arch:x64arch:x86image:win11-20240709-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    30-07-2024 17:47

General

  • Target

    SRCkey.exe

  • Size

    3.1MB

  • MD5

    d0fa55b027cf3268483208bc5087bf14

  • SHA1

    758d9396522e8458159bb7b5186340caf767f691

  • SHA256

    c1fba0fc260e24b6f42a72d8725aac400465890e5ee1a422cd567229ec1609bc

  • SHA512

    418ae9524de8f7326fe77c2664f1cdf2f807c0a50fe6e2619cc32fb863eff08a1b3ec26c029f1e319f540e9074380e8ca2dc9fb3f65e0cb2d26947037967f48b

  • SSDEEP

    49152:PvyI22SsaNYfdPBldt698dBcjHkrRJ6VbR3LoGdGTHHB72eh2NT:Pvf22SsaNYfdPBldt6+dBcjHkrRJ6n

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.8.180:4782

Mutex

b532486b-fe2e-45a2-ac9b-42f784c55957

Attributes
  • encryption_key

    33E00C0591CE60DF8D1A4C8EBCF120A2AD5D348C

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Microsoft defender

  • subdirectory

    SubDir

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\SRCkey.exe
    "C:\Users\Admin\AppData\Local\Temp\SRCkey.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1728
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Microsoft defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:3504
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3988
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Microsoft defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2064

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

    Filesize

    3.1MB

    MD5

    d0fa55b027cf3268483208bc5087bf14

    SHA1

    758d9396522e8458159bb7b5186340caf767f691

    SHA256

    c1fba0fc260e24b6f42a72d8725aac400465890e5ee1a422cd567229ec1609bc

    SHA512

    418ae9524de8f7326fe77c2664f1cdf2f807c0a50fe6e2619cc32fb863eff08a1b3ec26c029f1e319f540e9074380e8ca2dc9fb3f65e0cb2d26947037967f48b

  • memory/1728-0-0x00007FFA30013000-0x00007FFA30015000-memory.dmp

    Filesize

    8KB

  • memory/1728-1-0x0000000000BE0000-0x0000000000F04000-memory.dmp

    Filesize

    3.1MB

  • memory/1728-2-0x00007FFA30010000-0x00007FFA30AD2000-memory.dmp

    Filesize

    10.8MB

  • memory/1728-9-0x00007FFA30010000-0x00007FFA30AD2000-memory.dmp

    Filesize

    10.8MB

  • memory/3988-10-0x00007FFA30010000-0x00007FFA30AD2000-memory.dmp

    Filesize

    10.8MB

  • memory/3988-11-0x00007FFA30010000-0x00007FFA30AD2000-memory.dmp

    Filesize

    10.8MB

  • memory/3988-12-0x000000001B7A0000-0x000000001B7F0000-memory.dmp

    Filesize

    320KB

  • memory/3988-13-0x000000001BFF0000-0x000000001C0A2000-memory.dmp

    Filesize

    712KB

  • memory/3988-14-0x00007FFA30010000-0x00007FFA30AD2000-memory.dmp

    Filesize

    10.8MB