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: 1361

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]: 2 (Skitnet, Katz Stealer)
Major changes to detections(s) [2]: 333
Updated threat detection(s) [3]: 336

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:

Skitnet (RAT)

Skitnet (Bossnet) is a complex malware created by LARVA-306 with stealth features, persistence mechanisms, and multiple programming languages. Detailed analysis reveals insights into its behavior and second-stage loader.

Skitnet - Thehackernews |

Total number of detection methods: 2
Kill chain phase(s): command and control
MITRE ATT&CK: T1071

Katz Stealer (Data Theft)

Katz Stealer is a comprehensive data theft tool that targets web browsers, wallets, communication platforms, emails, gamers, network credentials, and utilizes surveillance tools for broad system reconnaissance.

Total number of detection methods: 1
Kill chain phase(s): command and control

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):

ACR Stealer (Data Theft)

ACR Stealer is a Malware-as-a-Service offered by threat actor SheldIO on Russian cybercrime forums since March 2024, possibly related to a previous private stealer program.

Added kill chain phase(s): command and control, actions on objectives
Previously supported kill chain phase(s): command and control, actions on objectives
MITRE ATT&CK added: T1071
Methods added: 5

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, command and control
Previously supported kill chain phase(s): command and control, delivery
MITRE ATT&CK added: T1566, T1041
Previously existing MITRE ATT&CK: T1041, T1071, T1587, T1566, T1583, T1665, T1102
Methods added: 56

Botnet Generic (Botnet)

A botnet is a network of compromised devices controlled by a central server to carry out cyber attacks, steal data, send spam, and grant unauthorized access to devices.

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: T1071
Previously existing MITRE ATT&CK: T1071
Methods added: 3

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: 21

Interlock Ransomware (Ransomware)

Interlock ransomware, discovered in 2024, engages in Big Game Hunting and double extortion but doesn't operate as a Ransomware-as-a-Service group. Data Leak Site "Worldwide Secrets Blog" negotiates ransom prices with victims.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control
Methods added: 6

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
Methods added: 15

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
Methods added: 52

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: 3

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

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
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1071, T1027, T1189
Methods added: 21

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

Stealer and Exfiltration (Data Theft)

Info stealers gather sensitive data on infected computers to send to attackers, typically targeting online banking, social media, email, and FTP accounts. They use various methods including hooking browsers and keylogging.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): actions on objectives, command and control, installation, delivery, exploitation
MITRE ATT&CK added: T1005
Previously existing MITRE ATT&CK: T1071, T1005, T1041, T1567, T1486, T1587, 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
Previously supported kill chain phase(s): command and control, delivery
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1041, T1071, T1001, T1102
Methods added: 8

XWorm (RAT)

Cyble research labs found a malware developer advertising a powerful Windows RAT on the dark web during a threat-hunting exercise.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, delivery
MITRE ATT&CK added: T1573
Previously existing MITRE ATT&CK: T1071, T1573
Methods added: 137

Zebrocy (Trojan)

Zebrocy is a versatile Trojan used by APT28 since 2015, with variants in multiple programming languages like C++, Delphi, and C#. It is detailed on MITRE.

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

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
ACR Stealer	5	command and control, actions on objectives	dns, tls, http	74	actions on objectives, command and control	dns, http, tls	2025-05-28
APT35	56	delivery, command and control	dns, tls, http	1892	command and control, delivery	dns, ftp, http, tcp, tls, udp	2025-05-31
Botnet Generic	3	command and control	http	31	actions on objectives, command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-05-28
Fake Browser	21	exploitation	dns, tls, http	1645	command and control, delivery, exploitation	dns, http, tls	2025-05-31
Interlock Ransomware	6	command and control	dns, tls, http	10	command and control	dns, http, tcp, tls	2025-05-28
Katz Stealer	1	command and control	http	1	command and control	http	2025-05-28
LandUpdate808	15	command and control	dns, tls, http	483	command and control, delivery	dns, http, tls	2025-05-31
Lumma	52	command and control, actions on objectives	dns, tls, http	5948	actions on objectives, command and control, delivery, installation	dns, http, tls	2025-05-31
NetSupport RAT	3	command and control	http	111	actions on objectives, command and control, exploitation, installation	dns, http, tls	2025-05-31
Powershell	1	installation	http	58	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls	2025-05-28
RAT Generic	1	command and control	tcp	274	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls, udp	2025-05-29
Skitnet	2	command and control	dns, tls	2	command and control	dns, tls	2025-05-28
SocGholish	21	command and control	dns, tls, http	1506	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2025-05-31
Stealc	1	exploitation	http	14	command and control, exploitation	http	2025-05-28
Stealer and Exfiltration	1	command and control	http	465	actions on objectives, command and control, delivery, exploitation, installation	dns, ftp, http, smtp, tcp, tcp-pkt, tls	2025-05-28
Unknown APT	8	command and control	http, dns, tls, tcp	475	command and control, delivery	dns, http, tcp, tls	2025-05-28
XWorm	137	command and control	tcp-pkt	3322	command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-05-30
Zebrocy	2	command and control	http	63	actions on objectives, command and control, delivery	dns, http, tls	2025-05-28

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