Overview

overview

10

Static

static

10

Client-built.exe

windows7-x64

10

Client-built.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    34s
  • max time network
    40s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30-06-2024 13:13

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General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    1e48869d1ce254c1aba0e61aedcdba8e

  • SHA1

    cf79b1e78d9e1616208e653c4df4eef3b9f7360b

  • SHA256

    ca182b6ce56a01a69122b24469fe5ad78e0cda78caeb49e5a814e2ac5774a10a

  • SHA512

    fc6469a2297258cd9723f2d6c795e78c5b065ed709384bb18fe0fb8255cb2760e0633ec2683652ef88abd87ac21ef1d31eee3fd35e64f464d4da0c205fdcb343

  • SSDEEP

    49152:7vilL26AaNeWgPhlmVqvMQ7XSKeQ03far7ToGddTHHB72eh2NT:7vaL26AaNeWgPhlmVqkQ7XSKu3Y

Score
10/10
quasaroffice04spywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.150:4782

Mutex

4fa54cdc-4bee-4759-b0fd-21bb6d6f9eed

Attributes
  • encryption_key

    99A3D9CE1DE6501187FC4C0E50EBB3FE8AD7B9A8

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Microsoft Task Manager Worker Service

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

    trojanspywarequasar
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • 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 FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5036
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Microsoft Task Manager Worker Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4880
    • 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 FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:384
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Microsoft Task Manager Worker Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3176

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

System Information Discovery

1
T1082

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

    1e48869d1ce254c1aba0e61aedcdba8e

    SHA1

    cf79b1e78d9e1616208e653c4df4eef3b9f7360b

    SHA256

    ca182b6ce56a01a69122b24469fe5ad78e0cda78caeb49e5a814e2ac5774a10a

    SHA512

    fc6469a2297258cd9723f2d6c795e78c5b065ed709384bb18fe0fb8255cb2760e0633ec2683652ef88abd87ac21ef1d31eee3fd35e64f464d4da0c205fdcb343

    Download Submit
  • memory/384-10-0x00007FFA75250000-0x00007FFA75D11000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/384-11-0x00007FFA75250000-0x00007FFA75D11000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/384-12-0x000000001E260000-0x000000001E2B0000-memory.dmp
    Filesize

    320KB

    Download
  • memory/384-13-0x000000001E370000-0x000000001E422000-memory.dmp
    Filesize

    712KB

    Download
  • memory/384-14-0x00007FFA75250000-0x00007FFA75D11000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/5036-1-0x0000000000550000-0x0000000000874000-memory.dmp
    Filesize

    3.1MB

    Download
  • memory/5036-0-0x00007FFA75253000-0x00007FFA75255000-memory.dmp
    Filesize

    8KB

    Download
  • memory/5036-2-0x00007FFA75250000-0x00007FFA75D11000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/5036-9-0x00007FFA75250000-0x00007FFA75D11000-memory.dmp
    Filesize

    10.8MB

    Download