Menu

  • Alerts
  • Incidents
  • News
  • APTs
  • Cyber Decoded
  • Cyber Hygiene
  • Cyber Review
  • Cyber Tips
  • Definitions
  • Malware
  • Threat Actors
  • Tutorials

Useful Tools

  • Password generator
  • Report an incident
  • Report to authorities
No Result
View All Result
CTF Hack Havoc
CyberMaterial
  • Education
    • Cyber Decoded
    • Definitions
  • Information
    • Alerts
    • Incidents
    • News
  • Insights
    • Cyber Hygiene
    • Cyber Review
    • Tips
    • Tutorials
  • Support
    • Contact Us
    • Report an incident
  • About
    • About Us
    • Advertise with us
Get Help
Hall of Hacks
  • Education
    • Cyber Decoded
    • Definitions
  • Information
    • Alerts
    • Incidents
    • News
  • Insights
    • Cyber Hygiene
    • Cyber Review
    • Tips
    • Tutorials
  • Support
    • Contact Us
    • Report an incident
  • About
    • About Us
    • Advertise with us
Get Help
No Result
View All Result
Hall of Hacks
CyberMaterial
No Result
View All Result
Home Malware

Sparrowdoor (Backdoor Malware)

June 30, 2023
Reading Time: 2 mins read
in Malware, Types of Malware
Name Sparrowdoor
Associated Groups FamousSparrow APT
Type of Malware Backdoor Malware
Date of Initial Activity 2021
Motivation Espionage, steal information
Attack Vectors Vulnerable internet-facing web applications, exploited known remote code execution vulnerabilities in Microsoft Exchange, ProxyLogon, Microsoft SharePoint and Oracle Opera
Targeted System Windows

Overview

SparrowDoor is an advanced backdoor used by the FamousSparrow APT group to spy on hotels, governments and more. It was spotted exploiting the Microsoft Exchange ProxyLogon vulnerability around March 2021. The backdoor is loaded using DLL Hijacking combined with a legitimate binary, to help bypass AV products.

Targets

Mainly Hotels,and other sectors such as governments, international organizations, engineering companies and law firm. Targets Regular Users from Brazil, Burkina Faso, South Africa, Canada, Israel, France, Guatemala, Lithuania, Saudi Arabia, Taiwan, Thailand and United Kingdom.

Tools/ Techniques Used

SparrowDoor is a persistent 32-bit loader and backdoor targeting the Windows operating system. The backdoor can be tasked with various commands, such as opening a reverse shell connection with the configured C2 server or exfiltrating data.

There are numerous design features included in the malware to evade detection and frustrate analysis. Once the server is compromised, attackers deploy several custom tools: A Mimikatz variant, A small utility that drops ProcDump on disk and uses it to dump the lsass process, probably in order to gather in-memory secrets, such as credentials, Nbtscan, a NetBIOS scanner, A loader for the SparrowDoor backdoor. SparrowDoor is initially loaded via DLL search order hijacking, using three elements – a legitimate K7 Computing executable (Indexer.exe) used as the DLL hijacking host, a malicious DLL (K7UI.dll), and encrypted shellcode (MpSvc.dll) – all of which are dropped in %PROGRAMDATA%\Software\.

In 2022, Trellix discovered A new variant of SparrowDoor was discovered containing a new functionality. The malware performs reflective loading of the payload, uses multiple defense techniques, uses HTTPS for command-and-control communication, and can open a reverse shell.

A new Windows service or registry run key is used for persistence while token impersonation, dll side-loading, process injection, masquerading, and signed binary proxy execution are used for defense evasion.

References

  1. FamousSparrow: A suspicious hotel guest
  2. SparrowDoor
Tags: Backdoor MalwareCyberattackCybersecurityespionageFamousSparrow APTMalwaremalware nameMicrosoft ExchangeMicrosoft SharePointSparrowdoorStealerVulnerabilities
ADVERTISEMENT

Related Posts

Iranian Phishing Campaign (Scam) – Malware

Iranian Phishing Campaign (Scam) – Malware

March 2, 2025
Fake WalletConnect (Infostealer) – Malware

Fake WalletConnect (Infostealer) – Malware

March 2, 2025
SilentSelfie (Infostealer) – Malware

SilentSelfie (Infostealer) – Malware

March 2, 2025
Sniper Dz (Scam) – Malware

Sniper Dz (Scam) – Malware

March 2, 2025
TikTok Malware Scam (Trojan) – Malware

TikTok Malware Scam (Trojan) – Malware

March 2, 2025
Zombinder (Exploit Kit) – Malware

Zombinder (Exploit Kit) – Malware

March 2, 2025

Latest Alerts

SAP S4hana Exploited Vulnerability

Virustotal Finds Undetected SVG Files

Russian APT28 Deploys Outlook Backdoor

CISA Flags TP Link Router Flaws

Lazarus Hackers Exploit ZeroDay, Deploy Rats

Google Patches 120 Flaws In Android

Subscribe to our newsletter

    Latest Incidents

    North Korean Hackers Fake Interviews

    Bridgestone Confirms Cyberattack

    Cybersecurity Firms Hit By Breach

    Salesloft Drift Attacks Hits Vendors

    Jaguar Land Rover Hit By Cyber Incident

    Hackers Use Grok Ai To Spread Malware

    CyberMaterial Logo
    • About Us
    • Contact Us
    • Jobs
    • Legal and Privacy Policy
    • Site Map

    © 2025 | CyberMaterial | All rights reserved

    Welcome Back!

    Login to your account below

    Forgotten Password?

    Retrieve your password

    Please enter your username or email address to reset your password.

    Log In

    Add New Playlist

    No Result
    View All Result
    • Alerts
    • Incidents
    • News
    • Cyber Decoded
    • Cyber Hygiene
    • Cyber Review
    • Definitions
    • Malware
    • Cyber Tips
    • Tutorials
    • Advanced Persistent Threats
    • Threat Actors
    • Report an incident
    • Password Generator
    • About Us
    • Contact Us
    • Advertise with us

    Copyright © 2025 CyberMaterial