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: 1650

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 (Shadow RAT)
Major changes to detections(s) [2]: 130
Updated threat detection(s) [3]: 132

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:

Shadow RAT (RAT)

Shadow RAT's WinRE persistence is difficult to remediate, as it can survive an OS reinstallation. The dual-family deployment increases persistence, and the AMSI and ETW bypasses create detection gaps. Integration with Kematian stealer reduces forensic footprint.

Shadow RAT - Malpedia |

Total number of detection methods: 2
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):

BPFDoor (Backdoor)

BPFDoor is a passive backdoor used by a China-based threat actor, supporting TCP, UDP, and ICMP protocols for C2 communication, providing the actor with various interaction methods with the implant.

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: T1041
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): exploitation, delivery, command and control, installation
MITRE ATT&CK added: T1189, T1105
Previously existing MITRE ATT&CK: T1071, T1027, T1189, T1105, T1102, T1566, T1036
Methods added: 10

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): delivery, command and control
Previously supported kill chain phase(s): command and control, actions on objectives, delivery, installation
MITRE ATT&CK added: T1105, T1071
Previously existing MITRE ATT&CK: T1071, T1587, T1573, T1566, T1486, T1496, T1041
Methods added: 8

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: 3

Generic Loader (Loader)

Loaders are evolving remote access Trojans, offering user-friendly interfaces, self-healing capabilities, and a platform for botmasters to sell bots. They are typically lightweight to evade security measures.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, delivery, actions on objectives
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1071, T1496, T1566, T1105
Methods added: 4

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, exploitation, actions on objectives
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1189, T1105, T1071
Methods added: 9

LedgerChecker (Data Theft)

LedgerChecker Stealer is a Windows-based malware that steals sensitive user data, focusing on cryptocurrency assets like seed phrases and private keys. Discovered in April 2026, actively tracked by malware analysts.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s):
MITRE ATT&CK added: T1005
Methods added: 1

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: 24

MaaS (Data Theft)

MaaS is a cybercrime business model where developers lease or sell malware to affiliates on the dark web. Customers pay using cryptocurrency for tools like ransomware and keyloggers, with customer support and evasion updates included. This model lowers the barrier to entry for cybercrime.

Added kill chain phase(s): command and control, delivery
Previously supported kill chain phase(s):
MITRE ATT&CK added: T1105, T1071
Methods added: 8

MageCart (Data Theft)

FIN6 or Magecart is a cybercrime group that steals payment card data from PoS systems in hospitality and retail, selling it on underground markets for profit.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): actions on objectives, command and control, delivery
MITRE ATT&CK added: T1105
Previously existing MITRE ATT&CK: T1587, T1071
Methods added: 1

MaskGramStealer (Data Theft)

Info stealers are malware that gather data from infected computers and send it to attackers. They acquire data through various methods such as keylogging, form grabbing, and web injection scripts.

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

Obfuscated File (Trojan)

Adversaries use encryption, encoding, and obfuscation to hide executable files for evasion. This common tactic is used on various platforms and networks to avoid detection.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): delivery
MITRE ATT&CK added: T1105
Methods added: 2

Pulsar RAT (RAT)

Pulsar RAT enables live chat control of compromised host while covertly delivering advanced infostealer via Donut Loader, highlighting dual capabilities of interactive administration and stealthy payload delivery.

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: T1041
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
Methods added: 12

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

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, 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, T1095, T1105, T1486, T1587, T1496
Methods added: 5

XRat (RAT)

RATs are software that enable remote users to control systems. Adversaries can use, modify, or create RATs to gain unauthorized access to systems.

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

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: 20

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
BPFDoor	2	command and control	tcp	22	command and control	dns, http, icmp, tcp, tls, udp	2026-05-15
ClickFix	10	delivery	dns, tls, http	646	command and control, delivery, exploitation, installation	dns, http, tls	2026-05-15
Command and Control	8	delivery, command and control	http, http1	658	actions on objectives, command and control, delivery, installation	dns, http, http1, icmp, tcp, tcp-pkt, tls	2026-05-15
Fake Browser	3	exploitation	dns, tls, http	2059	command and control, delivery, exploitation	dns, http, tls	2026-05-12
Generic Loader	4	command and control	tcp	151	actions on objectives, command and control, delivery	dns, http, http1, tcp, tcp-pkt, tls	2026-05-13
LandUpdate808	9	command and control	dns, tls, http	985	actions on objectives, command and control, delivery, exploitation	dns, http, tls	2026-05-15
LedgerChecker	1	command and control	http	1	command and control	http	2026-05-11
Lumma	24	command and control, actions on objectives	dns, tls, http	8134	actions on objectives, command and control, delivery, installation	dns, http, tls	2026-05-16
MaaS	8	command and control, delivery	dns, tls, http	8	command and control, delivery	dns, http, tls	2026-05-11
MageCart	1	delivery	http	520	actions on objectives, command and control, delivery	dns, http, tls	2026-05-15
MaskGramStealer	1	actions on objectives	http	14	actions on objectives, command and control	dns, http, http1, tls	2026-05-15
Obfuscated File	2	delivery	http	8	delivery	http, tcp	2026-05-15
Pulsar RAT	2	command and control	tcp-pkt, tcp	3	command and control	tcp, tcp-pkt	2026-05-14
RAT Generic	12	command and control	dns, tls, http	446	actions on objectives, command and control, delivery, installation	dns, http, http1, tcp, tcp-pkt, tls, udp	2026-05-15
Shadow RAT	2	command and control	tcp-pkt, tcp	2	command and control	tcp-pkt, tcp	2026-05-15
SocGholish	15	command and control	dns, tls, http	2272	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2026-05-16
Stealer and Exfiltration	5	command and control, actions on objectives	http	536	actions on objectives, command and control, delivery, exploitation, installation	dns, ftp, http, http1, smtp, tcp, tcp-pkt, tls	2026-05-15
XRat	3	command and control	http1, http, tcp-pkt	24	command and control	dns, http, http1, icmp, tcp, tcp-pkt, tls	2026-05-15
XWorm	20	command and control	tcp-pkt	5181	command and control, delivery	dns, http, tcp, tcp-pkt, tls	2026-05-16

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