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: 1313

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 (RustyStealer, TA2726, SvcStealer, Specter Insight)
Major changes to detections(s) [2]: 269
Updated threat detection(s) [3]: 345

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:

RustyStealer (Data Theft)

RustyStealer is a malware family tied to ransomware attacks, showing a growing trend of cybercriminals collaborating in their operations.

RustyStealer - Abuse.ch | RustyStealer - JOESandbox | RustyStealer - AnyRun |

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

TA2726 (APT)

TA2726 serves as a TDS for TA2727 and TA569, distributing SocGholish malware that pretends to be a browser update on compromised sites.

Total number of detection methods: 106
Kill chain phase(s): command and control
MITRE ATT&CK: T1189

SvcStealer (Data Theft)

SvcStealer 2025 is an information stealer malware spread through spear phishing emails. It collects sensitive data like machine information, user credentials, and cryptocurrency wallets, sending it to a command-and-control server.

SvcStealer - Abuse.ch | SvcStealer - AnyRun | SvcStealer - JOESandbox |

Total number of detection methods: 2
Kill chain phase(s): command and control, actions on objectives
MITRE ATT&CK: T1567

Specter Insight (Offensive Tools)

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

Total number of detection methods: 1
Kill chain phase(s): command and control
MITRE ATT&CK: T1567

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
Methods added: 24

Arechclient (RAT)

Remote Access Trojans allow covert surveillance and unauthorized access to a victim PC by mimicking keylogger behaviors, providing remote access through communication protocols, and enabling extensive control over the victim machine.

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

Command and Control (Generic CnC)

Adversaries may use custom command and control protocols to communicate, mimicking or developing protocols on top of standard network stacks, instead of using existing Standard Application Layer Protocols.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, actions on objectives, delivery, installation
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: 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: 24

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: 106

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: 1

OilRig (APT)

OilRig, a suspected Iranian threat group, targets various industries in the Middle East since 2014. FireEye links group to Iranian government based on infrastructure details and targeting alignment.

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

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: 8

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: 21

TA455 (APT)

Meta took action against a hacking group from Iran that targeted various industries worldwide. The group's tactics resembled another threat actor, but with different targets, infrastructure, and malware.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, installation
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: 54

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	24	command and control	dns, tls, http	1680	command and control, delivery	dns, ftp, http, tcp, tls, udp	2025-03-25
Arechclient	1	command and control	http	7	command and control	http, tcp, tcp-pkt	2025-03-27
Command and Control	3	command and control	dns, tls, http	547	actions on objectives, command and control, delivery, installation	dns, http, icmp, tcp, tcp-pkt, tls	2025-03-28
Fake Browser	6	exploitation	dns, tls, http	1518	command and control, delivery, exploitation	dns, http, tls	2025-03-28
Kimsuky	3	command and control	dns, tls, http	353	actions on objectives, command and control, delivery	dns, ftp, ftp-data, http, tcp, tls	2025-03-27
LandUpdate808	24	command and control	dns, tls, http	356	command and control, delivery	dns, http, tls	2025-03-28
Lumma	106	command and control, actions on objectives	dns, tls, http	5011	actions on objectives, command and control, delivery, installation	dns, http, tls	2025-03-29
MuddyWater	3	command and control	dns, tls, http	55	actions on objectives, command and control, delivery	dns, http, tcp, tls	2025-03-26
NetSupport RAT	1	command and control	http	94	actions on objectives, command and control, exploitation, installation	dns, http, tls	2025-03-29
OilRig	3	command and control	dns, tls, http	79	actions on objectives, command and control, delivery	dns, http, tls, udp	2025-03-28
RAT Generic	8	command and control	tcp	247	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls, udp	2025-03-27
RustyStealer	2	command and control, actions on objectives	http	2	command and control, actions on objectives	http	2025-03-28
SocGholish	21	command and control	dns, tls, http	1359	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2025-03-29
Specter Insight	1	command and control	http	1	command and control	http	2025-03-28
SvcStealer	2	command and control, actions on objectives	http	2	command and control, actions on objectives	http	2025-03-28
TA2726	71	command and control	dns, tls, http	106	command and control	dns, tls, http	2025-03-28
TA455	3	command and control	dns, tls, http	557	command and control, installation	dns, http, tls	2025-03-26
Unknown APT	9	command and control	dns, tls, http	250	command and control, delivery	dns, http, tls	2025-03-28
XWorm	54	command and control	tcp-pkt, tls	2735	command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-03-29

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