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: 1518

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 (PeerBlight)
Major changes to detections(s) [2]: 419
Updated threat detection(s) [3]: 433

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:

PeerBlight (Backdoor)

PeerBlight, a Linux backdoor related to RotaJakiro and Pink malware families, uses a systemd service and disguises as a daemon process to avoid detection.

Total number of detection methods: 14
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):

APT-C-35 (APT)

Viceroy Tiger is an adversary linked to India targeting entities in Pakistan, particularly government and security organizations, using spear phishing emails and malware. Identified as APT-C-35 with unique EHDevel framework.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): delivery, command and control
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1587, T1071, T1041
Methods added: 23

APT28 (APT)

APT28, linked to Russia's Main Intelligence Directorate, compromised the Hillary Clinton campaign, DNC, and DCCC in 2016 to interfere with U.S. election. Active since 2004.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): command and control, delivery, actions on objectives, exploitation
MITRE ATT&CK added: T1018, T1041
Previously existing MITRE ATT&CK: T1041, T1071
Methods added: 2

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
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: 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, actions on objectives
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1189, T1105, T1071
Methods added: 6

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: 69

More_Eggs (Trojan)

"More_eggs is a JScript backdoor utilized by Cobalt Group and FIN6. It has two versions, 2.0 and 4.4, with its name originating from a variable in its code."

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

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
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1071, T1027, T1189
Methods added: 13

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, command and control
Previously supported kill chain phase(s): command and control, exploitation
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1071
Methods added: 14

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: 36

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, actions on objectives
Previously supported kill chain phase(s): command and control, delivery, actions on objectives
MITRE ATT&CK added: T1071, T1566
Previously existing MITRE ATT&CK: T1041, T1071, T1001, T1566, T1102
Methods added: 219

Vidar (Data Theft)

Vidar Stealer is a trojan used by cyber criminals to steal personal information from infected computers.

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

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: 24

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
APT-C-35	23	command and control	dns, tls, http	445	command and control, delivery	dns, http, tcp, tls	2025-12-11
APT28	2	delivery	http	799	actions on objectives, command and control, delivery, exploitation	dns, http, tcp, tcp-pkt, tls	2025-12-11
CastleLoader	1	command and control	http	7	actions on objectives, command and control, delivery	http	2025-12-13
Fake Browser	6	exploitation	dns, tls, http	1817	command and control, delivery, exploitation	dns, http, tls	2025-12-11
LandUpdate808	6	command and control	dns, tls, http	694	actions on objectives, command and control, delivery	dns, http, tls	2025-12-12
Lumma	69	command and control, actions on objectives	dns, tls, http	7084	actions on objectives, command and control, delivery, installation	dns, http, tls	2025-12-13
More_Eggs	1	exploitation	http	82	command and control, exploitation	dns, http, tls	2025-12-11
NetSupport RAT	2	command and control	http	174	actions on objectives, command and control, exploitation, installation	dns, http, tls	2025-12-13
PeerBlight	14	command and control	dns, tls, http, udp	14	command and control	dns, tls, http, udp	2025-12-11
RAT Generic	1	command and control	tcp	326	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls, udp	2025-12-10
SocGholish	13	command and control	tls, dns, http	1978	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2025-12-12
Stealc	14	delivery, command and control	http	28	command and control, delivery, exploitation	http	2025-12-13
Trojan Downloader	36	delivery	dns, tls, http	378	actions on objectives, command and control, delivery, installation	dns, http, tcp, tls, udp	2025-12-11
Unknown APT	219	command and control, delivery, actions on objectives	dns, tls, http	1830	actions on objectives, command and control, delivery	dns, http, tcp, tls	2025-12-12
Vidar	2	installation	http	68	actions on objectives, command and control, delivery, installation	dns, http, tls	2025-12-11
XWorm	24	command and control	tcp-pkt	4259	command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-12-10

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