Analysis

  • max time kernel
    142s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-06-2024 01:39

General

  • Target

    a53a585de940ceb15a7b30f6d6157b0e9722d7b81cea4a2dadb1f0c7410fae87.exe

  • Size

    916KB

  • MD5

    fb57053d7202dbaca1e71a649047597f

  • SHA1

    b5c39ce77aa7c9a0f5f044eb887fb4baec3ce0db

  • SHA256

    a53a585de940ceb15a7b30f6d6157b0e9722d7b81cea4a2dadb1f0c7410fae87

  • SHA512

    fe4f64695c0121180b2a0829f82cee6de42170d17b34125f1ac0741580e58c1c282ea1bc5d1a0c8a3ae597f3e2dc014c8980416a2bfdcf30db98df984cf1ab43

  • SSDEEP

    24576:tmkdueXjq0OQKc2YSEegpQRDLusJLK1lkyoLP:IkdueXjq0OQKc2YSEegpshk1lk

Malware Config

Extracted

Family

quasar

Version

2.8.0.1

Botnet

backup

C2

45.40.96.164:5552

Mutex

4zqoNUTZKMvnLHkoUD

Attributes
  • encryption_key

    S2EJJjFXQqrAnFg7XBWE

  • install_name

    Registry.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Hotels Client Startup

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Detects Windows exceutables bypassing UAC using CMSTP utility, command line and INF 1 IoCs
  • Detects Windows executables referencing non-Windows User-Agents 1 IoCs
  • Detects executables containing URLs to raw contents of a Github gist 1 IoCs
  • Detects executables embedding command execution via IExecuteCommand COM object 1 IoCs
  • Detects executables embedding registry key / value combination indicative of disabling Windows Defender features 1 IoCs
  • Detects file containing reversed ASEP Autorun registry keys 1 IoCs
  • detects Windows exceutables potentially bypassing UAC using eventvwr.exe 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a53a585de940ceb15a7b30f6d6157b0e9722d7b81cea4a2dadb1f0c7410fae87.exe
    "C:\Users\Admin\AppData\Local\Temp\a53a585de940ceb15a7b30f6d6157b0e9722d7b81cea4a2dadb1f0c7410fae87.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4820
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4080 --field-trial-handle=2328,i,5873823382323802923,13134441441264702821,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:4508

    Network

    MITRE ATT&CK Matrix

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/4820-0-0x0000000074EAE000-0x0000000074EAF000-memory.dmp

      Filesize

      4KB

    • memory/4820-1-0x00000000002F0000-0x00000000003DC000-memory.dmp

      Filesize

      944KB

    • memory/4820-2-0x00000000053B0000-0x0000000005954000-memory.dmp

      Filesize

      5.6MB

    • memory/4820-3-0x0000000004E00000-0x0000000004E92000-memory.dmp

      Filesize

      584KB

    • memory/4820-4-0x0000000074EA0000-0x0000000075650000-memory.dmp

      Filesize

      7.7MB

    • memory/4820-5-0x0000000004FF0000-0x0000000005056000-memory.dmp

      Filesize

      408KB

    • memory/4820-6-0x0000000005C00000-0x0000000005C12000-memory.dmp

      Filesize

      72KB

    • memory/4820-7-0x0000000006040000-0x000000000607C000-memory.dmp

      Filesize

      240KB

    • memory/4820-8-0x0000000006780000-0x000000000678A000-memory.dmp

      Filesize

      40KB

    • memory/4820-9-0x0000000074EAE000-0x0000000074EAF000-memory.dmp

      Filesize

      4KB

    • memory/4820-10-0x0000000074EA0000-0x0000000075650000-memory.dmp

      Filesize

      7.7MB