Somewhere right now, your home router might be helping take down a hospital, a gaming service, or a small business — and you’d never know.

That’s the business model of Masjesu: a sophisticated, commercially operated DDoS-for-hire (DDoS-as-a-service) botnet that has been quietly recruiting home routers, gateways, and IoT devices into its attack fleet since at least 2023. Researchers at Trellix published a deep-dive on April 8, 2026, exposing the full operational picture. SecurityWeek and SC Media followed with additional analysis.

The botnet is advertised on Telegram. You pay, you pick your target, you pick your flood type. The operator does the rest — using your neighbor’s router.

What Is Masjesu?

Masjesu (also tracked as XorBot due to its use of XOR-based encryption) is a commercial IoT botnet-for-rent. It was first documented by Chinese security vendor NSFOCUS in December 2023, linking it to an operator nicknamed “synmaestro.” Since then, it has grown significantly in both capability and geographic reach.

Unlike opportunistic botnets that spray infection across the internet, Masjesu is operated with unusual discipline: it deliberately avoids certain high-profile IP ranges (including Department of Defense networks) to maintain long-term stealth and avoid triggering government-level takedowns.

Key Characteristics

FeatureDetail
Operational sinceEarly 2023
Primary target devicesHome routers, gateways, IoT devices
Architectures targetedi386, MIPS, ARM, AMD64
Max observed DDoS capacity~290 Gbps
Distribution channelTelegram
EncryptionXOR-based (strings, configs, payloads)
Primary infection geographyVietnam (~50%), Brazil, India, Iran, Kenya, Ukraine
Evasion tacticDoD IP blocklist, targets avoided to preserve stealth

How Masjesu Infects Your Router

Masjesu uses a multi-stage infection process targeting known vulnerabilities in consumer router firmware. The attack chain typically follows this path:

  1. Initial scanning: Automated scanners probe internet-facing routers for known CVEs and default credentials. Popular targets include devices running outdated firmware from Tenda, MikroTik, TP-Link, and various no-name OEM brands.

  2. Exploitation: Once a vulnerable target is found, Masjesu exploits the flaw to gain a shell on the device. Many of the vulnerabilities used are years old — CVEs that were publicly disclosed but never patched on deployed devices.

  3. Architecture detection: The dropper determines the CPU architecture of the infected device and downloads the appropriate XorBot binary.

  4. Persistence: The malware installs itself to survive reboots by writing to persistent storage locations on the router’s filesystem.

  5. Command-and-control registration: The infected device connects to Masjesu’s C2 infrastructure, registers itself as available, and waits for attack instructions.

  6. DDoS on demand: When a customer purchases an attack on Telegram, the operator issues commands through the C2 infrastructure. The infected device begins flooding the target.

The DDoS Arsenal

Masjesu supports an unusually broad range of flood attack types, making it effective against targets with different network configurations and defenses:

  • Volume floods: UDP, ICMP, GRE
  • Protocol floods: TCP SYN, TCP ACK, TCP ACK+PSH, OSPF, IGMP
  • Application-layer floods: HTTP
  • Gaming/service floods: VSE (Valve Source Engine), RDP

The VSE and RDP capabilities suggest the operator actively markets to customers wanting to knock gaming servers or remote-access infrastructure offline — a common use case in the paid DDoS market.

Why This Is a Home User Problem

Most DDoS botnet coverage focuses on enterprise victims — the companies and services being attacked. But the actual infrastructure of every one of these attacks runs on compromised consumer devices sitting in people’s homes and small offices.

There are several real consequences for you if your router is infected:

Legal exposure: In some jurisdictions, knowingly or unknowingly allowing your device to be used in criminal attacks can create liability questions, particularly if the attack causes significant damages.

Degraded performance: When your router is actively participating in a DDoS flood, it’s consuming your upload bandwidth and CPU. You may notice slowness, particularly during attacks.

Pivoting: Once attackers have persistent access to your router, it can be used for more than DDoS — credential harvesting (as seen with APT28), traffic interception, or as a stepping stone into your home network.

Your IoT devices are next: Masjesu targets routers as its primary initial vector, but once inside your network, an attacker can move laterally to cameras, NAS drives, smart speakers, and other connected devices.

Am I Infected? Signs to Watch For

Masjesu is specifically designed to be stealthy, but there are behavioral indicators:

  • Unexplained upload traffic spikes: If your router’s traffic monitor shows large outbound data bursts at unusual hours, investigate.
  • Router running hot or fans spinning up: Unusual CPU activity during idle periods.
  • Slower-than-normal internet performance: Bandwidth being consumed by C2 communications or attack traffic.
  • Router admin panel becomes unresponsive: Some malware locks admin access to prevent discovery.
  • New open ports: Port scans of your router’s external IP reveal services that shouldn’t be exposed.

Most home users never check any of these. That’s why botnets like Masjesu thrive.

Hardening Your Router Against Masjesu

The good news: Masjesu relies entirely on known vulnerabilities and default credentials. A properly hardened router is a much harder target.

1. Update your firmware now. Masjesu exploits old CVEs. If your router has a firmware update available, install it today. Check your router admin panel or the manufacturer’s support site.

2. Change default admin credentials. The default username/password for most routers is publicly documented and systematically tested by scanners. Change both to something strong and unique.

3. Disable remote management. If you don’t need WAN-side access to your router’s admin panel, turn it off. This eliminates the most common initial attack surface.

4. Disable UPnP. Universal Plug and Play automatically opens ports on your router when apps request them. It’s frequently abused by malware to create persistent access. Disable it unless you have a specific reason to keep it on.

5. Check for unknown open ports. Use a free port scanning service (search “port checker”) to scan your router’s external IP and verify only expected ports are open.

6. Factory reset if you’re unsure. If you’ve had your router for years and never updated it, a factory reset followed by firmware update and credential change is the safest approach.

7. Consider router-level network monitoring. Routers with DD-WRT, OpenWRT, or manufacturer monitoring features can alert you to unusual traffic patterns.

The Commercial DDoS Ecosystem

Masjesu is a symptom of a broader trend: the industrialization of cybercrime. DDoS-for-hire services have become remarkably accessible. For a few dollars per hour on Telegram, anyone can rent a 200+ Gbps attack with no technical knowledge required.

The botnet operators profit from maintaining a large, stealthy fleet of compromised devices. Your router, once infected, generates passive revenue for them every time it participates in an attack. The incentive structure means they have every reason to keep infections alive as long as possible — and every reason to keep you from knowing you’re infected.

The only effective defense is a target that’s simply harder to compromise than the next device in the scan queue.

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