The Week in Review from Stamus Labs

Welcome to the weekly threat detection update report from Stamus Networks. Each week, you will receive this email with a summary of the updates.

Current Stamus Threat Intelligence (STI) release version: 1542

This week, in addition to daily ruleset and IOC updates, we provided Stamus Security Platform customers with the following improved defense(s):

New threat detection(s) added [1]: 1 (MaskGramStealer)
Major changes to detections(s) [2]: 140
Updated threat detection(s) [3]: 149

Note: a "method" as referenced below, is a discrete detection vector for a given threat.

New Threat(s) Detected

The following detections were added to your Clear NDR (formerly Stamus Security Platform) this past week:

MaskGramStealer (Data Theft)

Info stealers are malware that gather data from infected computers and send it to attackers. They acquire data through various methods such as keylogging, form grabbing, and web injection scripts.

MaskGramStealer - Malware bazaar | MaskGramStealer - Malpedia |

Total number of detection methods: 9
Kill chain phase(s): command and control, actions on objectives
MITRE ATT&CK: T1071

Major Detection Changes

The following detections were updated this past week with changes to kill chain phase(s) or MITRE ATT&CK tactic(s)/technique(s):

CastleLoader (Loader)

CastleLoader is a loader malware that surfaced in early 2025, distributing information stealers and RATs through Cloudflare-themed phishing attacks and fake Github repositories.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, actions on objectives, delivery
MITRE ATT&CK added: T1041
Previously existing MITRE ATT&CK: T1071, T1189, T1105, T1041
Methods added: 1

Fake Browser (Trojan)

Attackers infect enterprise networks with malware by promoting fake browser updates on hacked websites, leading to the installation of banking trojans and later ransomware encryption on compromised networks.

Added kill chain phase(s): exploitation
Previously supported kill chain phase(s): delivery, exploitation, command and control
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1071, T1189
Methods added: 15

LandUpdate808 (Trojan)

Fake update variants like SocGholish, Clear Fake, Smart Ape, and ClickFix are being tracked by a collaboration introducing the LandUpdate808 Fake Update Variant.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): delivery, command and control, actions on objectives
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1189, T1105, T1071
Methods added: 12

Lumma (Data Theft)

Lumma is a C-based information stealer sold on Russian underground forums and Telegram by LummaC since August 2022. It targets cryptocurrency wallets and has file grabber capabilities.

Added kill chain phase(s): command and control, actions on objectives
Previously supported kill chain phase(s): actions on objectives, command and control, installation, delivery
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1005, T1071, T1573, T1105
Methods added: 22

Mustang Panda (APT)

Mustang Panda is a China-based cyber threat actor observed since 2017, possibly operating since 2014. It targets government and non-government organizations in multiple countries like the U.S., Germany, and Myanmar.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, delivery
Methods added: 60

NetSupport RAT (RAT)

Remote Access Trojans allow covert surveillance and unauthorized access to victim PCs, collecting keystrokes, passwords, screenshots, and more. They differ from keyloggers by providing remote access capabilities to attackers.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): actions on objectives, command and control, exploitation, installation
MITRE ATT&CK added: T1105
Previously existing MITRE ATT&CK: T1071, T1105
Methods added: 2

PlugX (RAT)

PlugX is a RAT with modular plugins used by several threat groups for remote access. More information available on MITRE's website.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, delivery
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1041, T1071
Methods added: 2

Powershell (Lateral Movement)

Adversaries can abuse PowerShell for execution, discovery, and code running. Examples include Start-Process and Invoke-Command cmdlets, requiring administrator permissions for remote connections.

Added kill chain phase(s): command and control, actions on objectives
Previously supported kill chain phase(s): actions on objectives, command and control, delivery, installation
Methods added: 2

SocGholish (Social Engineering)

Malwarebytes found a new social engineering toolkit that uses compromised websites to perform advanced fingerprinting checks and deliver the NetSupport RAT payload.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, exploitation, delivery, reconnaissance, actions on objectives
Methods added: 3

Stealc (Data Theft)

Stealc, introduced by actor Plymouth on underground forums, written in C, can steal data from web browsers, crypto wallets, email clients, and messaging apps, built on Vidar, Raccoon, Mars, and RedLine.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): command and control, exploitation, delivery
MITRE ATT&CK added: T1105
Previously existing MITRE ATT&CK: T1071, T1105
Methods added: 4

Trojan Agent (Trojan)

A group of trojans with variable payloads can redirect web traffic, manipulate applications, drop/install malicious programs, and download/run additional malware. Behavior is not exhaustive.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): command and control, actions on objectives, delivery, installation
Methods added: 2

Unknown APT (APT)

Sophisticated adversary with expertise and resources uses multiple attack vectors to establish presence in organizations' IT infrastructure, exfiltrate information, undermine missions, and persistently adapt to defenders.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, delivery, actions on objectives
Methods added: 15

Other Threat Detection Update(s)

The following threat detection(s) were improved this past week with new or updated threat methods.

Name of threat	New coverage			Total coverage			Last updated
	New Detection methods	Kill chain phases	Protocols involved	Detection methods	Kill chain phases	Protocols involved
CastleLoader	1	command and control	tcp	10	actions on objectives, command and control, delivery	http, tcp	2026-01-09
Fake Browser	15	exploitation	dns, tls, http	1838	command and control, delivery, exploitation	dns, http, tls	2026-01-10
LandUpdate808	12	command and control	dns, tls, http	739	actions on objectives, command and control, delivery	dns, http, tls	2026-01-10
Lumma	22	command and control, actions on objectives	dns, tls, http	7292	actions on objectives, command and control, delivery, installation	dns, http, tls	2026-01-07
MaskGramStealer	9	command and control, actions on objectives	http, dns, tls	9	command and control, actions on objectives	http, dns, tls	2026-01-10
Mustang Panda	60	command and control	dns, tls, http	325	command and control, delivery	dns, http, tcp, tls	2026-01-06
NetSupport RAT	2	command and control	http	180	actions on objectives, command and control, exploitation, installation	dns, http, tls	2026-01-06
PlugX	2	command and control	http	130	command and control, delivery	dns, http, tcp, tcp-pkt, tls, udp	2026-01-06
Powershell	2	command and control, actions on objectives	http	72	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls	2026-01-09
SocGholish	3	command and control	dns, tls, http	1987	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2026-01-06
Stealc	4	delivery	dns, tls, http	45	command and control, delivery, exploitation	dns, http, tls	2026-01-06
Trojan Agent	2	delivery	http	613	actions on objectives, command and control, delivery, installation	dns, http, ip, smtp, tcp, tcp-pkt, tcp-stream, tls, udp	2026-01-09
Unknown APT	15	command and control	dns, tls, http	1866	actions on objectives, command and control, delivery	dns, http, tcp, tls	2026-01-06

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