Analysis

  • max time kernel
    150s
  • max time network
    135s
  • platform
    windows7_x64
  • resource
    win7-20240729-en
  • resource tags

    arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
  • submitted
    04-08-2024 12:13

General

  • Target

    9c682f5b5000cd003e76530706955a72.exe

  • Size

    3.1MB

  • MD5

    9c682f5b5000cd003e76530706955a72

  • SHA1

    1a69da76e05d114a317342dae3e9c7b10f107d43

  • SHA256

    36e6a3dd4bfc86c4e707f43cd9515707442d6c424b7661cb41766cfdca322522

  • SHA512

    33bd859542e1ae74d8c81427af44022cb91861dc02ee4202505f1e010487d06cb27e1aa83be6af17be4e2d8973289595b2ebe9bdf99a187956662df30b6dc88f

  • SSDEEP

    49152:CvIt62XlaSFNWPjljiFa2RoUYIqC41JoLoGdX/THHB72eh2NT:CvE62XlaSFNWPjljiFXRoUYIqC9

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

51.222.21.20:4782

Mutex

374acc94-a8cd-45c6-bc31-752e0f83541d

Attributes
  • encryption_key

    5B2A5F50FABB3F6748116D7077D95758D0DFFC77

  • install_name

    svchost.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    svchost

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 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 WriteProcessMemory 9 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\9c682f5b5000cd003e76530706955a72.exe
    "C:\Users\Admin\AppData\Local\Temp\9c682f5b5000cd003e76530706955a72.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2548
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "svchost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2892
    • C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1388
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "svchost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\svchost.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2108

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    9c682f5b5000cd003e76530706955a72

    SHA1

    1a69da76e05d114a317342dae3e9c7b10f107d43

    SHA256

    36e6a3dd4bfc86c4e707f43cd9515707442d6c424b7661cb41766cfdca322522

    SHA512

    33bd859542e1ae74d8c81427af44022cb91861dc02ee4202505f1e010487d06cb27e1aa83be6af17be4e2d8973289595b2ebe9bdf99a187956662df30b6dc88f

  • memory/1388-8-0x00000000003F0000-0x0000000000714000-memory.dmp

    Filesize

    3.1MB

  • memory/1388-10-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

    Filesize

    9.9MB

  • memory/1388-11-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

    Filesize

    9.9MB

  • memory/1388-12-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

    Filesize

    9.9MB

  • memory/2548-0-0x000007FEF5643000-0x000007FEF5644000-memory.dmp

    Filesize

    4KB

  • memory/2548-1-0x0000000000B90000-0x0000000000EB4000-memory.dmp

    Filesize

    3.1MB

  • memory/2548-2-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

    Filesize

    9.9MB

  • memory/2548-9-0x000007FEF5640000-0x000007FEF602C000-memory.dmp

    Filesize

    9.9MB