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: 1573

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]: 3 (upStage, Marco Stealer, DesckVB)
Major changes to detections(s) [2]: 179
Updated threat detection(s) [3]: 224

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 this past week:

upStage (Trojan)

A trojanized 7-Zip installer from a fake domain includes a concealed malware payload alongside the legitimate software. The malware updates independently through an additional channel.

Total number of detection methods: 37
Kill chain phase(s): command and control, delivery
MITRE ATT&CK: T1041, T1090, T1583, T1102

Marco Stealer (Data Theft)

Zscaler ThreatLabz found Marco Stealer, an information stealer targeting browser data, cryptocurrency wallets, and files from cloud services. It uses anti-analysis techniques and encrypted C2 communications via HTTP.

Total number of detection methods: 1
Kill chain phase(s): actions on objectives
MITRE ATT&CK: T1005

DesckVB (RAT)

DesckVB RAT is a stable and mature .NET RAT with multi-stage delivery and a plugin ecosystem, allowing for selective deployment of capabilities post-compromise.

Total number of detection methods: 7
Kill chain phase(s): command and control
MITRE ATT&CK: T1041

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):

APT35 (APT)

Iranian-backed group Magic Hound engages in cyber espionage targeting U.S. and Middle Eastern officials and organizations since 2014, likely working with the Islamic Revolutionary Guard Corps through elaborate social engineering tactics.

Added kill chain phase(s): delivery, actions on objectives
Previously supported kill chain phase(s): command and control, delivery
MITRE ATT&CK added: T1566
Previously existing MITRE ATT&CK: T1041, T1071, T1587, T1566, T1665, T1102
Methods added: 15

APT37 (APT)

APT37 is a North Korean cyber espionage group active since 2012, targeting victims in South Korea, Japan, Vietnam, Russia, Nepal, China, India, Romania, Kuwait, and other parts of the Middle East with various campaigns.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, delivery
MITRE ATT&CK added: T1041
Previously existing MITRE ATT&CK: T1071, T1041
Methods added: 3

ClickFix (Phishing)

In April 2024, researchers found compromised sites leading to an iframe on pley[.]es showing an error message. The payload domain was taken offline, preventing infection. Later, the iframe was replaced with the ClearFake inject.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): exploitation, delivery, command and control
Methods added: 5

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 contro
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1071, T1189
Methods added: 21

Generic Phishing (Phishing)

Phishing involves pretending to be a trusted entity to steal personal information through fake websites or messages, often targeting users of social media, banks, and online platforms.

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

Keitaro (Phishing)

Cyber criminals exploited the TDS platform Keitaro to redirect users to malware exploit kits RIG and Fallout, infecting them with malicious software. Legitimate TDS platforms are used for targeted advertising.

Added kill chain phase(s): exploitation
Previously supported kill chain phase(s): exploitation, delivery, command and control
Methods added: 1

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
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1189, T1105, T1071
Methods added: 14

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: 48

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

RAT Generic (RAT)

Remote Access Trojans allow covert surveillance and unauthorized access to victim PCs, collecting data like keystrokes and screenshots. They differ from keyloggers by enabling remote access for attackers.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): installation, command and control, actions on objectives, delivery
MITRE ATT&CK added: T1071, T1573
Previously existing MITRE ATT&CK: T1071, T1041, T1573
Methods added: 15

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
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1071, T1027, T1189
Methods added: 14

Spark (Backdoor)

Spark is a Windows backdoor discovered in 2017 and used for cyber espionage. It is capable of collecting system information and exfiltrating data from compromised systems.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control
MITRE ATT&CK added: T1583
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
Methods added: 1

TA4903 (APT)

Advanced persistent threats (APTs) are stealthy threat actors, often nation states or state-sponsored groups, who gain unauthorized access to networks for political or economic motivations, utilizing various tactics to remain undetected.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): delivery
Methods added: 3

TinyNuke (Data Theft)

TinyNuke (Nuclear Bot) is a banking trojan sold on underground marketplaces for $2500 in 2016, functioning like ZeuS to steal passwords. Its author later destroyed reputation by aggressive promotion.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): delivery, command and control, actions on objectives
Methods added: 1

Trojan Downloader (Downloader)

Trojan downloaders are malicious software that look legitimate, but can harm your computer by downloading files, often without user consent, to steal, damage, or disrupt your devices.

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

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: 3

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
APT35	15	delivery, actions on objectives	dns, tls, http	1983	actions on objectives, command and control, delivery	dns, ftp, http, tcp, tls, udp	2026-02-14
APT37	3	command and control	dns, tls, http	112	command and control, delivery	dns, http, tls	2026-02-12
ClickFix	5	delivery	http	273	command and control, delivery, exploitation	dns, http, tls	2026-02-14
DesckVB	7	command and control	tcp	7	command and control	tcp	2026-02-13
Fake Browser	21	exploitation	dns, tls, http	1915	command and control, delivery, exploitation	dns, http, tls	2026-02-13
Generic Phishing	15	delivery	dns, tls, http	68	command and control, delivery	dns, http, tls	2026-02-13
Keitaro	1	exploitation	http	406	command and control, delivery, exploitation	dns, http, tls	2026-02-11
LandUpdate808	14	command and control	dns, tls, http	830	command and control, delivery	dns, http, tls	2026-02-13
Lumma	48	command and control, actions on objectives	dns, tls, http	7501	actions on objectives, command and control, delivery, installation	dns, http, tls	2026-02-14
Marco Stealer	1	actions on objectives	http	1	actions on objectives	http	2026-02-13
NetSupport RAT	2	command and control	http	192	actions on objectives, command and control, exploitation, installation	dns, http, tls	2026-02-14
RAT Generic	15	command and control	dns, tls, http, tcp	349	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls, udp	2026-02-13
SocGholish	14	command and control	dns, tls, http	2072	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2026-02-14
Spark	3	command and control	dns, tls, http	11	command and control	dns, http, tls	2026-02-12
Stealc	1	delivery	http	49	command and control, delivery, exploitation	dns, http, tls	2026-02-13
TA4903	3	delivery	dns, tls, http	2459	delivery	dns, http, tls	2026-02-12
TinyNuke	1	delivery	http	15	actions on objectives, command and control, delivery	http, tcp, tls	2026-02-13
Trojan Downloader	15	delivery	dns, tls, http	408	actions on objectives, command and control, delivery, installation	dns, http, tcp, tls, udp	2026-02-11
Unknown APT	3	command and control	dns, tls, http	1938	actions on objectives, command and control, delivery	dns, http, tcp, tls	2026-02-13
upStage	37	command and control, delivery	tcp, dns, tls, http	37	command and control, delivery	tcp, dns, tls, http	2026-02-13

Additional Resources

Technical support
Join the conversation on Discord
Follow us Twitter
Follow us on LinkedIn
Subscribe to our YouTube channel
Stamus Networks website

Threat Detection Update