General

  • Target

    NewTextDocument.exe.zip

  • Size

    1KB

  • Sample

    250127-27nmqazjcm

  • MD5

    0206983f12db26f622bbe73b165f126f

  • SHA1

    e71f9fc602245a337f728e27917b0b716d3828f9

  • SHA256

    6b81b36622febc198dbe4596349b7b781cd6b278e9db9145a2de8b14b045e128

  • SHA512

    296372c60204ead1709a556001fd2a932e98814d30b42771beb19cc1298f92f3823372a83c1752f49f8073ea238e60f4c5e270a85b6dba2821621e68fd6f5cfc

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

PrudaBackend

C2

45.131.108.110:4782

Mutex

8f8e6059-ac4f-4e47-8d62-3ce070083ecf

Attributes
  • encryption_key

    D82EC4913FC5B28DDFF5AC48635D190A9342C6BD

  • install_name

    update.exe

  • log_directory

    Logs

  • reconnect_delay

    2500

  • startup_key

    Runtime Broker.exe

Extracted

Family

quasar

Version

1.4.1

Botnet

powerstealer

C2

192.168.56.1:4782

Mutex

6760d0e9-9df9-4aba-89be-4e5ce3e92cc8

Attributes
  • encryption_key

    057FCAF700E62ACFECC7338C474084AF9B47ABEB

  • install_name

    powerstealer.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Extracted

Family

vidar

C2

https://t.me/sc1phell

https://steamcommunity.com/profiles/76561199819539662

Attributes
  • user_agent

    Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:136.0) Gecko/20100101 Firefox/136.0

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

100.108.37.105:4444

127.0.0.1:4444

Mutex

95a85978-c10d-4a09-935b-c02a2a18a609

Attributes
  • encryption_key

    6FDAA03D192B9C03BF83E41A8BBF78996D321E27

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Extracted

Family

njrat

Version

0.7d

Botnet

HacKed

C2

hakim32.ddns.net:2000

127.0.0.1:5513

Mutex

67364a37f43593883a7b70eb2426799a

Attributes
  • reg_key

    67364a37f43593883a7b70eb2426799a

  • splitter

    |'|'|

Extracted

Family

xworm

C2

45.141.26.234:7000

Attributes
  • Install_directory

    %ProgramData%

  • install_file

    Java Update(32bit).exe

Targets

    • Target

      New Text Document.exe

    • Size

      4KB

    • MD5

      a239a27c2169af388d4f5be6b52f272c

    • SHA1

      0feb9a0cd8c25f01d071e9b2cfc2ae7bd430318c

    • SHA256

      98e895f711226a32bfab152e224279d859799243845c46e550c2d32153c619fc

    • SHA512

      f30e1ff506cc4d729f7e24aa46e832938a5e21497f1f82f1b300d47f45dae7f1caef032237ef1f5ae9001195c43c0103e3ab787f9196c8397846c1dea8f351da

    • SSDEEP

      48:6r1huik0xzYGJZZJOQOulbfSqXSfbNtm:IIxcLpf6zNt

    • Detect Vidar Stealer

    • Detect Xworm Payload

    • Njrat family

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar family

    • Quasar payload

    • Vidar

      Vidar is an infostealer based on Arkei stealer.

    • Vidar family

    • Xworm

      Xworm is a remote access trojan written in C#.

    • Xworm family

    • njRAT/Bladabindi

      Widely used RAT written in .NET.

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Disables Task Manager via registry modification

    • Downloads MZ/PE file

    • Modifies Windows Firewall

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Adds Run key to start application

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

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

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v15

Tasks