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: 1645

 

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]: 7 (MixShell, QNAPCrypt, PhantomPulse, REMUS, PHASEJAM, MaaS, LedgerChecker)

• Major changes to detections(s) [2]: 137

• Updated threat detection(s) [3]: 162

 

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:

 

MixShell (RAT)

MixShell is an in-memory implant using DNS TXT tunneling and HTTP fallback for C2 communication. It supports various operations and uses a custom hashing algorithm to locate Windows API functions dynamically.

MixShell - thehackernews

•  

• Total number of detection methods: 2

• Kill chain phase(s): command and control

• MITRE ATT&CK: T1071

 

QNAPCrypt (Ransomware)

QNAPCrypt ransomware encrypts files and delivers ransom note via text file. It operates differently by providing unique Bitcoin wallets to victims and requiring RSA key from C&C server before encryption.

QNAPCrypt - Intezer |

• Total number of detection methods: 4

• Kill chain phase(s): command and control, actions on objectives

 

PhantomPulse (RAT)

Elastic Security Labs discovered a social engineering campaign using Obsidian to target financial and cryptocurrency sectors. Elastic Defend detected and blocked the attack early, preventing the deployment of a new RAT named PHANTOMPULSE.

• Total number of detection methods: 4

• Kill chain phase(s): command and control, delivery

 

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.

• Total number of detection methods: 6

• Kill chain phase(s): command and control, actions on objectives

• MITRE ATT&CK: T1071

 

PHASEJAM (Trojan)

PHASEJAM is a malicious bash script that inserts a web shell into Ivanti Connect Secure appliance components, allowing remote access and code execution by threat actors. It blocks system upgrades and can execute arbitrary commands.

• Total number of detection methods: 2

• Kill chain phase(s): command and control

• MITRE ATT&CK: T1505

 

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.

• Total number of detection methods: 8

• Kill chain phase(s): command and control, delivery

• MITRE ATT&CK: T1105, T1071

 

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.

• Total number of detection methods: 1

• Kill chain phase(s): command and control

• MITRE ATT&CK: T1005

 

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

• Methods added: 7

 

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: 27

 

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

 

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: 33

 

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): command and control

• 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

 

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: 4

 

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

 

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

• Previously supported kill chain phase(s): command and control, exploitation, delivery

• MITRE ATT&CK added: T1105

• Previously existing MITRE ATT&CK: T1071, T1105

• Methods added: 17

 

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
BPFDoor	7	command and control	dns, tls, icmp, http	20	command and control	dns, http, icmp, tcp, tls, udp	2026-05-09
Fake Browser	27	exploitation	dns, tls, http	2056	command and control, delivery, exploitation	dns, http, tls	2026-05-09
LandUpdate808	9	command and control	dns, tls, http	976	actions on objectives, command and control, delivery, exploitation	dns, http, tls	2026-05-08
LedgerChecker	1	command and control	http	1	command and control	http	2026-05-11
Lumma	33	command and control, actions on objectives	dns, tls, http	8110	actions on objectives, command and control, delivery, installation	dns, http, tls	2026-05-09
MaaS	8	command and control, delivery	dns, tls, http	8	command and control, delivery	dns, tls, http	2026-05-11
MaskGramStealer	1	command and control	http1	13	actions on objectives, command and control	dns, http, http1, tls	2026-05-06
MixShell	2	command and control	http	2	command and control	http	2026-05-07
NetSupport RAT	4	command and control	http	223	actions on objectives, command and control, exploitation, installation	dns, http, tls	2026-05-09
PhantomPulse	4	command and control, delivery	http	4	command and control, delivery	http	2026-05-07
QNAPCrypt	4	command and control, actions on objectives	http1, tcp	4	command and control, actions on objectives	http1, tcp	2026-05-07
REMUS	6	command and control, actions on objectives	dns, tls, http	6	command and control, actions on objectives	dns, tls, http	2026-05-07
SocGholish	15	command and control	dns, tls, http	2257	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2026-05-09
Stealc	17	delivery	http	85	command and control, delivery, exploitation	dns, http, http1, tls	2026-05-09
XWorm	24	command and control	tcp-pkt	5161	command and control, delivery	dns, http, tcp, tcp-pkt, tls	2026-05-09

 

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