Analysis

  • max time kernel
    145s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-03-2024 02:10

General

  • Target

    2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe

  • Size

    3.1MB

  • MD5

    f54598770f770d815c9707dd33518eac

  • SHA1

    6acf4aaf1d74710ef92c0b99a4b263202fbefcb7

  • SHA256

    2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e

  • SHA512

    dc927e84c41121e43f281af15ede1dcce368f1f94e88b56c893a1dfda8aa412547fe5f77d46fcc6a9fc8842b860edf4b3a3c059919b460d0f8611035d9e42d36

  • SSDEEP

    49152:SvyI22SsaNYfdPBldt698dBcjHutbXPEhNvJJaoGdwjTHHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjHZhg

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

C2

www.exiles.site:14782

Mutex

a0f587a6-d40f-499d-8e9e-b0831e1cb678

Attributes
  • encryption_key

    49BF5A48970D914C7E70F494A8E16B5EFA3AB6A0

  • 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.

  • Quasar payload 3 IoCs
  • Detects Windows executables referencing non-Windows User-Agents 3 IoCs
  • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 3 IoCs
  • Detects executables containing common artifacts observed in infostealers 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Creates scheduled task(s) 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\2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe
    "C:\Users\Admin\AppData\Local\Temp\2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4564
    • 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⤵
      • Creates scheduled task(s)
      PID:1056
    • 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:2020
      • 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⤵
        • Creates scheduled task(s)
        PID:3324

Network

MITRE ATT&CK Matrix ATT&CK v13

Execution

Scheduled Task/Job

1
T1053

Persistence

Scheduled Task/Job

1
T1053

Privilege Escalation

Scheduled Task/Job

1
T1053

Discovery

Query Registry

1
T1012

Replay Monitor

Loading Replay Monitor...

Downloads

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

    2.8MB

    MD5

    9b8dc488ec3a22fc022e7eec9e80209c

    SHA1

    ea60d5484f2b26996e05b57a42bfd904c30a08f1

    SHA256

    81eecc4c0dd1d3b0e1599fb9ff660f8835716898f2f5c5cd4f82ece25bac0c55

    SHA512

    381cfeb65ee26606ab44ed8d737a4768510c96043808217efaa559af36472ff2df8ee871625cbdb0b8cdd57579ca06fce8f421d49e10e3cdba58b28a2cd04f5b

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

    2.9MB

    MD5

    fe047ebcf035cb5de9fdf2671f8ceaa7

    SHA1

    fb08f4c2c938cb6a5771aa56ef175e5bbbc53abc

    SHA256

    ecb5ea086d1b2e04547852a6ffc362a7e501deba8a81dddf5c8fc7a580e02ebd

    SHA512

    50f1695504d33d78b1ede4d28d607c4b6711323c162a4d054c1c19f92c88ca68f10ef16ebf8dd9dca2c3ef00bbc820e91f6b09508d6131607068a0bd80e6199c

  • memory/2020-9-0x00007FFD6B320000-0x00007FFD6BDE1000-memory.dmp
    Filesize

    10.8MB

  • memory/2020-11-0x0000000003200000-0x0000000003210000-memory.dmp
    Filesize

    64KB

  • memory/2020-12-0x000000001C8E0000-0x000000001C930000-memory.dmp
    Filesize

    320KB

  • memory/2020-13-0x000000001C9F0000-0x000000001CAA2000-memory.dmp
    Filesize

    712KB

  • memory/2020-14-0x00007FFD6B320000-0x00007FFD6BDE1000-memory.dmp
    Filesize

    10.8MB

  • memory/2020-15-0x0000000003200000-0x0000000003210000-memory.dmp
    Filesize

    64KB

  • memory/4564-0-0x00000000008D0000-0x0000000000BF4000-memory.dmp
    Filesize

    3.1MB

  • memory/4564-1-0x00007FFD6B320000-0x00007FFD6BDE1000-memory.dmp
    Filesize

    10.8MB

  • memory/4564-2-0x000000001B7D0000-0x000000001B7E0000-memory.dmp
    Filesize

    64KB

  • memory/4564-10-0x00007FFD6B320000-0x00007FFD6BDE1000-memory.dmp
    Filesize

    10.8MB