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: 1747

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]: 4 (GemStone, PATCHCORD, BlueMoon, Webshell Generic)
New methods additions on existing threats [2]: 180
New detection methods in total [3]: 186

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 Stamus NDR this past week:

GemStone (Data Theft)

GemStone browser extension acts as an AI-powered browsing companion by Google Gemini while functioning as a browser surveillance and credential-theft backdoor, using malicious JavaScript service worker named background.js.

Total number of detection methods: 6
Kill chain phase(s): command and control
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):

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): delivery, command and control
Previously supported kill chain phase(s): delivery, command and control, actions on objectives
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1041, T1071
Methods added: 11

AMOS (Data Theft)

Atomic macOS Stealer targets various information on victim's machine, including keychain passwords, system info, and browser data. It can extract auto-fills, passwords, cookies, wallets, and credit card info.

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

APT-C-23 (APT)

APT-C-23 group uses Windows and Android components in operations. Android components were first described in 2017, and multiple analyses of their mobile malware were published in the same year.

Added kill chain phase(s): command and control, actions on objectives
Previously supported kill chain phase(s): delivery, command and control, actions on objectives
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1041, T1071, T1082, T1573, T1583
Methods added: 4

AsyncRAT (RAT)

RAT is a tool that enables remote user control over a system. Adversaries can use existing, modify, or create their own RATs for unauthorized access or malicious activities.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): delivery, installation, command and control
MITRE ATT&CK added: T1041, T1105
Previously existing MITRE ATT&CK: T1071, T1105, T1203, T1587
Methods added: 2

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): delivery, exploitation, installation, command and control
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1027, T1036, T1071, T1102, T1105, T1189, T1190, T1566
Methods added: 42

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): delivery, exploitation, command and control, actions on objectives
Previously existing MITRE ATT&CK: T1001, T1041, T1071, T1587
Methods added: 3

DarkSword (Data Theft)

DarkSword is an exploit chain and infostealer in JavaScript that leverages multiple vulnerabilities on iOS devices to access and exfiltrate sensitive information, orchestrated through various malicious modules.

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

Emotet (Data Theft)

Emotet is a versatile malware used for downloading other malicious software, especially targeting the banking sector. It first appeared in 2014 and is often linked to TrickBot and IcedID.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): delivery, exploitation, command and control, actions on objectives
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1041
Methods added: 7

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): actions on objectives
Previously supported kill chain phase(s): delivery, command and control
MITRE ATT&CK added: T1566
Previously existing MITRE ATT&CK: T1071, T1189
Methods added: 3

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, exploitation, command and control, actions on objectives
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1071, T1105, T1189
Methods added: 3

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): delivery, installation, command and control, actions on objectives
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1005, T1071, T1105, T1573
Methods added: 3

OnionDrop (Loader)

OnionDrop is a significant threat with a sophisticated evasion architecture that exceeds nation-state tooling. The focus on high-profile threats leaves a gap in addressing commoditized malware like OnionDrop.

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

Ransomware Generic (Ransomware)

Ransomware is a type of malware that blocks users from their system or files and demands ransom payment for access. Originally payment was sent via mail, now via cryptocurrency or credit card.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): delivery, command and control, actions on objectives
MITRE ATT&CK added: T1105
Previously existing MITRE ATT&CK: T1071, T1105, T1486, T1573
Methods added: 1

REMUS (Data Theft)

Gen believes this new malware is a 64-bit version of Lumma Stealer, capable of stealing various valuable information like browser passwords and cryptocurrency. It uses EtherHiding and includes anti-analysis checks.

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

ReverseLoader (Loader)

Loaders are basic remote access Trojans allowing attackers to control compromised computers or bots. They are traditionally lightweight to avoid detection, but can evolve with added features for cybercriminals.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): delivery, installation, command and control
MITRE ATT&CK added: T1105
Previously existing MITRE ATT&CK: T1105
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): reconnaissance, delivery, exploitation, command and control, actions on objectives
Previously existing MITRE ATT&CK: T1027, T1071, T1189
Methods added: 18

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): command and control
Previously supported kill chain phase(s): delivery
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1071, T1566
Methods added: 2

Trojan Dropper (Trojan)

Dropper is a type of Trojan that installs malware on a system. It can hide the malware within itself or download it to the target machine once activated.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): delivery, installation, command and control, actions on objectives
MITRE ATT&CK added: T1105
Previously existing MITRE ATT&CK: T1041, T1071, T1496
Methods added: 3

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): delivery, command and control, actions on objectives
Previously existing MITRE ATT&CK: T1001, T1041, T1071, T1102, T1105, T1566
Methods added: 4

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): delivery, command and control
MITRE ATT&CK added: T1573
Previously existing MITRE ATT&CK: T1071, T1573
Methods added: 63

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 methods	Kill chain phases	Protocols	Methods	Kill chain phases	Protocols
ACR Stealer	11	delivery, command and control	dns, http, tls	94	delivery, command and control, actions on objectives	dns, http, http1, tls	2026-09-17
AMOS	2	delivery	http	60	delivery, command and control, actions on objectives	dns, http, http1, tls	2026-09-18
APT-C-23	4	command and control, actions on objectives	http, http1	785	delivery, command and control, actions on objectives	dns, http, http1, tls	2026-09-19
AsyncRAT	2	delivery	http	483	delivery, installation, command and control	dns, http, http1, tcp, tcp-pkt, tls	2026-09-19
ClickFix	42	delivery	dns, http, tls	862	delivery, exploitation, installation, command and control	dns, http, tls	2026-09-23
Cobalt Strike	3	command and control	dns, http, tls	615	delivery, exploitation, command and control, actions on objectives	dns, http, http1, smb, tcp, tls, udp	2026-09-18
DarkSword	3	command and control	dns, http, tls	4	command and control	dns, http, tls	2026-09-18
Emotet	7	command and control	http	77	delivery, exploitation, command and control, actions on objectives	dns, http, http1, smb, tls	2026-09-22
GemStone	6	command and control	http	6	command and control	http	2026-09-17
Generic Phishing	3	actions on objectives	http	71	delivery, command and control, actions on objectives	dns, http, tls	2026-09-17
LandUpdate808	3	command and control	dns, http, tls	1219	delivery, exploitation, command and control, actions on objectives	dns, http, tls	2026-09-17
Lumma	3	command and control, actions on objectives	dns, http, tls	8686	delivery, installation, command and control, actions on objectives	dns, http, tls	2026-09-18
OnionDrop	2	delivery, command and control	http	5	delivery, command and control	http	2026-09-17
Ransomware Generic	1	delivery	http	47	delivery, command and control, actions on objectives	dns, http, http1, tls	2026-09-17
REMUS	3	command and control	http	9	command and control, actions on objectives	dns, http, tls	2026-09-17
ReverseLoader	1	delivery	http	20	delivery, installation, command and control	dns, http, tls	2026-09-19
SocGholish	18	command and control	dns, http, tls	2518	reconnaissance, delivery, exploitation, command and control, actions on objectives	dns, http, tcp, tcp-pkt, tls	2026-09-23
TA4903	2	command and control	http	2515	delivery, command and control	dns, http, tls	2026-09-22
Trojan Dropper	3	delivery	http	431	delivery, installation, command and control, actions on objectives	dns, http, http1, tcp, tls, udp	2026-09-17
Unknown APT	4	command and control	dns, http	2196	delivery, command and control, actions on objectives	dns, http, http1, tcp, tls, udp	2026-09-17
XWorm	63	command and control	tcp-pkt	5943	delivery, command and control	dns, http, tcp, tcp-pkt, tls	2026-09-19

Threat Detection Update