Analysis

  • max time kernel
    444s
  • max time network
    446s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241211-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241211-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    15-12-2024 15:40

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    749286088524b5c49a9f6fd5dd15de49

  • SHA1

    bc255bc2f5a7f50e8fec2e5eca55c82de0bb15a2

  • SHA256

    e1dd16d3d0550466cd1e5efa60ea8f0d3b204f52ddccb4b58d46a7dba9dc5587

  • SHA512

    b0ac4798d04e443f6e795e718bf301a885bc96ab2bd12f4d2b14d47e75aa897b5f53c22dab14b95a12a4f2e177d86a78a0af08ab916906a9a9ce7eb0b860dd8e

  • SSDEEP

    49152:WvWI22SsaNYfdPBldt698dBcjHSlRJ6ibR3LoGd09THHB72eh2NT:Wv722SsaNYfdPBldt6+dBcjHSlRJ6c

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

KDOTCrypt

C2

fedx.ddns.net:7000

Mutex

f70e50c5-1467-4cc3-8be1-b4ca15c11c35

Attributes
  • encryption_key

    92470F4731518ABFA77DC89068544FB7E7B7C459

  • 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 family
  • Quasar payload 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Enumerates physical storage devices 1 TTPs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5020
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\urjvr2YSBGsY.bat" "
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1016
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:4428
        • C:\Windows\system32\PING.EXE
          ping -n 10 localhost
          3⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          • Runs ping.exe
          PID:3468

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\urjvr2YSBGsY.bat

      Filesize

      213B

      MD5

      4e152bc968b3e152ea292cb750a251cd

      SHA1

      deb3a27ffe7479374bdf7dd1bbddb2f4bc7a3c66

      SHA256

      9e62ff1cffc1bf72b7055b66c861c8bdb327833c91e8f58f55b9b7891e454633

      SHA512

      af909879185a23a369b18c7594eb0033b3ee551991b2441c5fdac5b179f02a6ec0acea43bdbcc2ce661cd8645dff024b3663c3302602be6230b1b65b631fb12e

    • memory/5020-0-0x00007FF97D833000-0x00007FF97D835000-memory.dmp

      Filesize

      8KB

    • memory/5020-1-0x00000000009D0000-0x0000000000CF4000-memory.dmp

      Filesize

      3.1MB

    • memory/5020-2-0x00007FF97D830000-0x00007FF97E2F2000-memory.dmp

      Filesize

      10.8MB

    • memory/5020-3-0x000000001B870000-0x000000001B8C0000-memory.dmp

      Filesize

      320KB

    • memory/5020-4-0x000000001DF40000-0x000000001DFF2000-memory.dmp

      Filesize

      712KB

    • memory/5020-5-0x0000000002E70000-0x0000000002E82000-memory.dmp

      Filesize

      72KB

    • memory/5020-6-0x000000001DE80000-0x000000001DEBC000-memory.dmp

      Filesize

      240KB

    • memory/5020-14-0x00007FF97D830000-0x00007FF97E2F2000-memory.dmp

      Filesize

      10.8MB