Overview

overview

10

Static

static

10

ARC.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    12s
  • max time network
    16s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23-06-2024 14:42

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General

  • Target

    ARC.exe

  • Size

    3.1MB

  • MD5

    b7d46680cfdf6f6eb8975b917ebc247b

  • SHA1

    024e3fcc6ab0d6c4eb1b9c8cce6f2d9acc341ce2

  • SHA256

    0bee76d8a4d71ea7549639ebee593d3b1ef8e57d958b4f248668d3aa5e3dd810

  • SHA512

    fadf39b5ee1a89257a940202038363866793e5d8a7e1256563f09177735cb2fd715fd0a0bcfcca6aed679d7b11a302022e9fc4ab53df264383a5b15eed53fa4f

  • SSDEEP

    49152:bv2I22SsaNYfdPBldt698dBcjHo75D1vHLoud58NTHHB72eh2NT:bvb22SsaNYfdPBldt6+dBcjHo75R1

Score
10/10
quasaroffice04spywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.4.84:4782

Mutex

c297f8b7-0f1f-4701-b622-6cffabd13dfa

Attributes
  • encryption_key

    54FD30A1784C7771340BE35C5F3402E09B0E8FCC

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

    trojanspywarequasar
  • 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.

    persistenceexecution
  • 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\ARC.exe
    "C:\Users\Admin\AppData\Local\Temp\ARC.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1008
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:1072
    • 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:984
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1420

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Persistence

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1
T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

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

    3.1MB

    MD5

    b7d46680cfdf6f6eb8975b917ebc247b

    SHA1

    024e3fcc6ab0d6c4eb1b9c8cce6f2d9acc341ce2

    SHA256

    0bee76d8a4d71ea7549639ebee593d3b1ef8e57d958b4f248668d3aa5e3dd810

    SHA512

    fadf39b5ee1a89257a940202038363866793e5d8a7e1256563f09177735cb2fd715fd0a0bcfcca6aed679d7b11a302022e9fc4ab53df264383a5b15eed53fa4f

    Download Submit
  • memory/984-10-0x00007FFDCF890000-0x00007FFDD0351000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/984-11-0x00007FFDCF890000-0x00007FFDD0351000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/984-12-0x000000001DAE0000-0x000000001DB30000-memory.dmp
    Filesize

    320KB

    Download
  • memory/984-13-0x000000001DBF0000-0x000000001DCA2000-memory.dmp
    Filesize

    712KB

    Download
  • memory/1008-0-0x00007FFDCF893000-0x00007FFDCF895000-memory.dmp
    Filesize

    8KB

    Download
  • memory/1008-1-0x00000000005F0000-0x0000000000914000-memory.dmp
    Filesize

    3.1MB

    Download
  • memory/1008-2-0x00007FFDCF890000-0x00007FFDD0351000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/1008-9-0x00007FFDCF890000-0x00007FFDD0351000-memory.dmp
    Filesize

    10.8MB

    Download