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: 1329

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 (VIP Recovery Keylogger, Trox Stealer, BRICKSTORM, SNOWLIGHT)
Major changes to detections(s) [2]: 265
Updated threat detection(s) [3]: 265

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:

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): command and control
Previously supported kill chain phase(s): command and control, delivery
MITRE ATT&CK added: T1041
Previously existing MITRE ATT&CK: T1041, T1071, T1587, T1566, T1583, T1665, T1102
Methods added: 26

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: 6

DCRAT (RAT)

DarkCrystal, or dcRAT, is a dangerous Remote Access Trojan that gives hackers control over infected devices, posing significant threats to user safety. RATs can manipulate machines in different ways.

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

DeerStealer (Data Theft)

Signed application abused on Github to redirect victims from a fake site mimicking a legitimate one.

Added kill chain phase(s): command and control, delivery
Previously supported kill chain phase(s): command and control
MITRE ATT&CK added: T1041, T1071
Previously existing MITRE ATT&CK: T1071
Methods added: 25

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

Kimsuky (APT)

Kimsuky, a North Korean threat group since 2013, targets think tanks and nuclear-related entities. Recently expanded to US, Russia, Europe; known for Korea Hydro & Nuclear Power Co. compromise.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, actions on objectives, delivery
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, command and control
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1189
Methods added: 12

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: 102

MuddyWater (APT)

MuddyWater is an Iranian threat group targeting mainly Middle Eastern nations, with victims in telecommunications, government, and oil sectors. Previously linked to FIN7, now believed to be a distinct group for espionage.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, delivery, actions on objectives
Methods added: 3

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: 6

PureLogs (Data Theft)

PureLogs malware can have a keylogger module that logs all keyboard inputs, leading to significant damage, especially financial, when a computer is infected with this type of malware.

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

QuasarRAT (RAT)

QuasarRAT is an open-source remote access tool available on GitHub, developed in C#. It is categorized as software S0262 by MITRE.

Added kill chain phase(s): command and control, actions on objectives
Previously supported kill chain phase(s): command and control, delivery
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1071, T1587
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: 5

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: 15

Specter Insight (Offensive Tools)

SpecterInsight is a versatile C2 framework for red teaming, threat emulation, and training, built on .NET and supporting multiple platforms.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control
MITRE ATT&CK added: T1041
Previously existing MITRE ATT&CK: T1567
Methods added: 5

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): actions on objectives
Previously supported kill chain phase(s): actions on objectives, command and control, installation, delivery, exploitation
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1071, T1005, T1041, T1567, T1486, T1587, T1496
Methods added: 1

TA456 (APT)

Proofpoint researchers discovered a long-term social engineering and targeted malware campaign by TA456, an Iranian state-aligned threat actor. The attacker used a fake social media persona to send malware to an aerospace defense contractor's employee.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): delivery, command and control
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): command and control, delivery
Methods added: 9

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: 33

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	26	command and control	dns, tls, http	1718	command and control, delivery	dns, ftp, http, tcp, tls, udp	2025-04-16
ClickFix	6	delivery	dns, tls, http	141	command and control, delivery, exploitation	dns, http, tls	2025-04-19
DCRAT	2	command and control, installation	tls	55	actions on objectives, command and control, installation	dns, http, tcp, tls	2025-04-15
DeerStealer	25	command and control, delivery	dns, tls, http	80	command and control, delivery	dns, http, tls	2025-04-17
Fake Browser	6	exploitation	dns, tls, http	1551	command and control, delivery, exploitation	dns, http, tls	2025-04-17
Kimsuky	3	command and control	dns, tls, http	356	actions on objectives, command and control, delivery	dns, ftp, ftp-data, http, tcp, tls	2025-04-16
LandUpdate808	12	command and control	dns, tls, http	407	command and control, delivery	dns, http, tls	2025-04-19
Lumma	102	command and control, actions on objectives	dns, tls, http	5334	actions on objectives, command and control, delivery, installation	dns, http, tls	2025-04-19
MuddyWater	3	command and control	dns, tls, http	58	actions on objectives, command and control, delivery	dns, http, tcp, tls	2025-04-16
NetSupport RAT	6	command and control	http	103	actions on objectives, command and control, exploitation, installation	dns, http, tls	2025-04-19
PureLogs	1	actions on objectives	tcp	6	actions on objectives, command and control	http, tcp	2025-04-16
QuasarRAT	2	command and control, actions on objectives	http	54	actions on objectives, command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-04-19
RAT Generic	5	command and control	tcp	260	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls, udp	2025-04-16
SocGholish	15	command and control	dns, tls, http	1404	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2025-04-19
Specter Insight	5	command and control	dns, tls, http	6	command and control	dns, http, tls	2025-04-15
Stealer and Exfiltration	1	actions on objectives	http	458	actions on objectives, command and control, delivery, exploitation, installation	dns, ftp, http, smtp, tcp, tcp-pkt, tls	2025-04-15
TA456	3	command and control	dns, tls, http	129	command and control, delivery	dns, http, tls	2025-04-18
Unknown APT	9	command and control	dns, tls, http	259	command and control, delivery	dns, http, tls	2025-04-16
XWorm	33	command and control	tcp-pkt	2890	command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-04-19

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