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: 1567

 

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]: 5 (Chrysalis, VoidLink, Insecure legacy protocol - NTLM, NotepadPlus Supply Chain Attack, Pulsar RAT)

• Major changes to detections(s) [2]: 222

• Updated threat detection(s) [3]: 234

 

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:

 

Chrysalis (Backdoor)

Rapid7 Labs and MDR team discovered a sophisticated campaign by Chinese APT group Lotus Blossom targeting organizations in Southeast Asia and Central America, using a custom backdoor called Chrysalis.

• Total number of detection methods: 7

• Kill chain phase(s): command and control

• MITRE ATT&CK: T1071

 

VoidLink (RAT)

VoidLink is a cloud-native Linux malware with modular post-exploitation capabilities for cloud environments. It showcases strong operational security features and is designed for long-term, stealthy access by sophisticated threat actors.

• Total number of detection methods: 1

• Kill chain phase(s): command and control

• MITRE ATT&CK: T1071

 

NotepadPlus Supply Chain Attack (Supply Chain Attack)

Securelist telemetry revealed unique execution chains in a supply chain attack on Notepad++. Attackers rotated C2 server addresses over four months, targeting individuals and organizations in various countries, but Kaspersky solutions were able to block the attacks.

• Total number of detection methods: 3

• Kill chain phase(s): delivery

 

Pulsar RAT (RAT)

Pulsar RAT enables live chat control of compromised host while covertly delivering advanced infostealer via Donut Loader, highlighting dual capabilities of interactive administration and stealthy payload delivery.

• Total number of detection methods: 1

• 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):

 

Bitter (APT)

China's APT17 is a threat group targeting U.S. government entities, defense industry, law firms, IT companies, mining companies, and NGOs with network intrusions.

• Added kill chain phase(s): delivery, command and control

• Previously supported kill chain phase(s): command and control, delivery, actions on objectives

• MITRE ATT&CK added: T1105, T1071

• Previously existing MITRE ATT&CK: T1041, T1071

• Methods added: 7

 

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

• MITRE ATT&CK added: T1566

• Previously existing MITRE ATT&CK: T1071, T1027, T1189, T1102, T1036, T1105

• Methods added: 1

 

Cobalt Strike (Pentest Tools)

Cobalt Strike is a commercial penetration testing tool that simulates advanced threat actor attacks, covering the full range of ATT&CK tactics and integrating with tools like Metasploit and Mimikatz.

• Added kill chain phase(s): command and control

• Previously supported kill chain phase(s): command and control, actions on objectives, exploitation, delivery

• MITRE ATT&CK added: T1071

• Previously existing MITRE ATT&CK: T1041, T1071, T1001, T1587

• Methods added: 9

 

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: 12

 

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: 18

 

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: 39

 

Matanbuchus (Trojan)

BelialDemon launched Matanbuchus Loader, a malware-as-a-service for $2,500, to distribute second-stage malware. Malware loaders download malicious software from command and control servers.

• 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: T1041

• Methods added: 4

 

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: 42

 

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: T1573

• Previously existing MITRE ATT&CK: T1071, T1041, T1573

• Methods added: 1

 

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: 12

 

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: 6

 

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): actions on objectives

• Previously supported kill chain phase(s): command and control, actions on objectives, delivery, installation

• MITRE ATT&CK added: T1071

• Previously existing MITRE ATT&CK: T1041, T1071, T1496

• Methods added: 1

 

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, delivery

• Previously supported kill chain phase(s): command and control, delivery, actions on objectives

• MITRE ATT&CK added: T1041

• Previously existing MITRE ATT&CK: T1041, T1071, T1001, T1566, T1102

• Methods added: 68

 

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
Bitter	7	delivery, command and control	http, dns, tls	93	actions on objectives, command and control, delivery	dns, http, tcp, tcp-pkt, tls	2026-02-05
Chrysalis	7	command and control	dns, tls, http	7	command and control	dns, tls, http	2026-02-05
ClickFix	1	delivery	http	268	command and control, delivery, exploitation	dns, http, tls	2026-02-04
Cobalt Strike	9	command and control	dns, tls, http	602	actions on objectives, command and control, delivery, exploitation	dns, http, smb, tcp, tls, udp	2026-02-04
Fake Browser	12	exploitation	dns, tls, http	1894	command and control, delivery, exploitation	dns, http, tls	2026-02-07
LandUpdate808	18	command and control	dns, tls, http	816	command and control, delivery	dns, http, tls	2026-02-07
Lumma	39	command and control, actions on objectives	dns, tls, http	7453	actions on objectives, command and control, delivery, installation	dns, http, tls	2026-02-07
Matanbuchus	4	command and control	http, dns, tls	21	command and control, delivery	dns, http, tls	2026-02-07
Mustang Panda	42	command and control	dns, tls, http	367	command and control, delivery	dns, http, tcp, tls	2026-02-07
NetSupport RAT	2	command and control	http	190	actions on objectives, command and control, exploitation, installation	dns, http, tls	2026-02-04
NotepadPlus Supply Chain Attack	3	delivery	http	3	delivery	http	2026-02-05
Pulsar RAT	1	command and control	tcp	1	command and control	tcp	2026-02-05
RAT Generic	1	command and control	tcp	334	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls, udp	2026-02-03
SocGholish	12	command and control	dns, tls, http	2058	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2026-02-07
TA4903	6	delivery	dns, tls, http	2456	delivery	dns, http, tls	2026-02-04
Trojan Agent	1	actions on objectives	http	614	actions on objectives, command and control, delivery, installation	dns, http, ip, smtp, tcp, tcp-pkt, tcp-stream, tls, udp	2026-02-05
Unknown APT	68	command and control, delivery	dns, tls, http	1935	actions on objectives, command and control, delivery	dns, http, tcp, tls	2026-02-05
VoidLink	1	command and control	http	1	command and control	http	2026-02-03

 

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