Kimwolf: Technical Analysis of a Large-Scale Android Botnet Targeting Consumer Devices

Executive Overview

Kimwolf is a large Android-based botnet that compromised over 1.8 million devices worldwide, primarily Android TV boxes, set-top boxes, and low-cost tablets. The infections span more than 220 countries, with the highest concentration observed in Brazil, India, the United States, Argentina, South Africa, and the Philippines.

Although Kimwolf includes large-scale DDoS functionality, its primary purpose is commercial proxy abuse. Roughly 96% of all observed activity involved routing third-party traffic through infected devices. Between November 19 and November 22, the botnet briefly exposed its scale by issuing over 1.7 billion DDoS commands, targeting random IP ranges in the US, China, France, Germany, and Canada.

Initial Infection and Exploitation Path

Kimwolf did not rely on a single critical vulnerability or zero-day exploit. Instead, it exploited a weak security model common in Android TV ecosystems.

Primary Infection Method

The main infection vector was trojanized Android APKs, distributed through:

Unofficial app stores
Pre-installed vendor firmware
Sideloaded “system” or “utility” applications
Fake updates and media-related apps

Many Android TV devices allow unknown APK installation by default, and users frequently sideload applications due to limited access to official app stores.

Malware Architecture and Behavior

Kimwolf operates primarily as a native ARM ELF binary, allowing it to run independently of Android’s application layer once installed.

It establishes persistence by registering boot-time execution and disguises itself using system-like process names. Configuration data and operational strings are obfuscated to slow analysis.

Command and Control Design

All communications between infected devices and command servers are encrypted using TLS. Kimwolf embeds its own cryptographic routines rather than relying on system libraries.

Before accepting instructions, the malware validates commands using ECDSA-signed messages, ensuring only authorized servers can control infected devices.

To resist takedown efforts, Kimwolf uses:

DNS over TLS (DoT) for domain resolution
IPv6-based address obfuscation
Blockchain-based naming records to dynamically store real C2 information

Operational Capabilities

Proxy Monetization

The primary use of Kimwolf is operating as a residential proxy network, forwarding traffic on behalf of third parties. This makes infected devices valuable assets for criminal services that require trusted residential IP addresses.

DDoS Capability

Kimwolf also includes a denial-of-service engine supporting:

UDP floods
TCP floods
ICMP floods

This capability was demonstrated during the November attack window.

Indicators of Compromise (Defanged)

Malicious Android Package Names

com[.]n2[.]systemservice0644
com[.]n2[.]systemservice062
com[.]n2[.]systemservice063

Embedded Payload / Resource Names

libniggakernel
ji[.]so
c0[.]so
q8[.]so

Suspicious Process Names

netd_services
tv_helper

UNIX Socket Artifacts

@niggaboxv*

Known Malicious Domains (C2 and Download Infrastructure)

api[.]groksearch[.]net
zachebt[.]chachasli[.]de
rtrdedge1[.]samsungcdn[.]cloud
staging[.]pproxy1[.]fun
sdk-dl-prod[.]proxiessdk[.]online
sdk-dl-production[.]proxiessdk[.]store
nnkjzfaxkjanxzk[.]14emeliaterracewestroxburyma02132[.]su
pawsatyou[.]eth

Known Malicious IP Addresses (Defanged)

93[.]95[.]112[.]50
93[.]95[.]112[.]51
93[.]95[.]112[.]52
93[.]95[.]112[.]53
93[.]95[.]112[.]54
93[.]95[.]112[.]55
93[.]95[.]112[.]59

File Hashes (MD5)

Malicious APK Samples

887747dc1687953902488489b805d965
b688c22aabcd83138bba4afb9b3ef4fc
2fd5481e9d20dad6d27e320d5464f71e
5f4ed952e69abb337f9405352cb5cc05
4cd750f32ee5d4f9e335751ae992ce64

Native ELF / Shared Object Files

726557aaebee929541f9c60ec86d356e
bf06011784990b3cca02fe997ff9b33d
1c03d82026b6bcf5acd8fc4bcf48ed00

Network-Level Indicators

Persistent outbound encrypted traffic from Android TV devices
Unexpected DNS over TLS (port 853) activity
Residential IPs behaving like proxy endpoints
Abnormally high outbound session counts

Risk and Impact

Kimwolf demonstrates how consumer devices have become a reliable source of criminal infrastructure. The lack of visibility and security enforcement on Android TV platforms allows infections to persist for months without detection.

The greatest long-term risk is not disruption, but silent abuse of trusted residential networks.

Final Takeaway

Kimwolf is a monetization-focused, resilient botnet built for longevity rather than noise. Its success highlights systemic weaknesses in the Android TV supply chain and application trust model.

Without stronger controls on firmware integrity and application installation, similar botnets will continue to scale quietly in consumer environments.