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: 1351

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]: 6 (Interlock Ransomware, Gremlin Stealer, TerraStealer, BlackByte Ransomware, RedExt, RATatouille)
Major changes to detections(s) [2]: 435
Updated threat detection(s) [3]: 456

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:

Interlock Ransomware (Ransomware)

Interlock ransomware, discovered in 2024, engages in Big Game Hunting and double extortion but doesn't operate as a Ransomware-as-a-Service group. Data Leak Site "Worldwide Secrets Blog" negotiates ransom prices with victims.

Interlock Ransomware - Malpedia |

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

Gremlin Stealer (Data Theft)

Unit 42 researchers discovered Gremlin Stealer, a C# malware advertised on Telegram since mid-March 2025, capable of stealing sensitive data from victims' browsers, clipboard, and local disk.

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

TerraStealer (Data Theft)

TerraStealerV2 steals browser credentials, cryptocurrency wallet data, and browser extension info, targeting Chrome “Login Data” database but does not bypass ABE protection. Data is sent to Telegram and wetransfers[.]io.

TerraStealer - Malpedia |

Total number of detection methods: 4
Kill chain phase(s): command and control, actions on objectives
MITRE ATT&CK: T1071

BlackByte Ransomware (Ransomware)

BlackByte is a ransomware threat group that began operating in 2021, known for targeting critical infrastructure entities in North America with various versions of ransomware. More recent versions use stronger encryption.

BlackByte Ransomware - Malpedia |

Total number of detection methods: 3
Kill chain phase(s): command and control

RedExt (Pentest Tools)

RedExt is a browser extension-based Command & Control framework designed for authorized red team operations and security assessments.

Total number of detection methods: 3
Kill chain phase(s): command and control, actions on objectives

RATatouille (Supply Chain Attack)

RedExt is a browser extension-based Command & Control framework designed for authorized red team operations and security assessments.

RATatouille - Aikido |

Total number of detection methods: 7
Kill chain phase(s): command and control
MITRE ATT&CK: T1071

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):

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
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1071, T1027, T1189, T1102, T1036, T1105
Methods added: 6

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: 4

ConnectWise (Trojan)

Trojans are malicious software disguised as legitimate programs used by cyber-thieves to gain access to users' systems. They can spy on users, steal data, and provide backdoor access to the system.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): 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: 12

Fake Service (Phishing)

Phishing involves scammers posing as familiar companies to obtain personal information. Consumers should avoid responding to suspicious emails requesting personal or financial details to prevent falling victim to these scams.

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

Havoc (Offensive Tools)

Havoc is a flexible post-exploitation command and control framework developed by @C5pider, available on Github for use.

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

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: 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
Methods added: 93

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

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: 3

SideWinder (APT)

Actor targeting Pakistan military, linked to Indian company with unique malware implementations since 2012. Leverages CVE-2017-11882 exploits, deploys Powershell payload in final stages. Low confidence in attribution.

Added kill chain phase(s): command and control, delivery
Previously supported kill chain phase(s): command and control, delivery, actions on objectives
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1071
Methods added: 15

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: 18

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, T1041
Previously existing MITRE ATT&CK: T1071, T1005, T1041, T1567, T1486, T1587, T1496
Methods added: 7

Teal Kurma (APT)

Teal Kurma, a Turkish-based threat actor, was active in DNS hijacking attacks from 2018 to 2020. They have since evolved their tactics to include additional tools for espionage activities.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control
Methods added: 3

Unk (RAT)

Backdoor:Linux/Unk.A threat can allow a hacker to gain unauthorized access and control of a PC. Microsoft warns against this dangerous malware.

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

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
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1041, T1071, T1001, T1102
Methods added: 208

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: 48

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
BlackByte Ransomware	3	command and control	dns, tls, http	3	command and control	dns, tls, http	2025-05-14
ClickFix	6	delivery	dns, tls, http	182	command and control, delivery, exploitation	dns, http, tls	2025-05-16
Command and Control	4	command and control	http, dns, tls	551	actions on objectives, command and control, delivery, installation	dns, http, icmp, tcp, tcp-pkt, tls	2025-05-14
ConnectWise	3	command and control	dns, tls, http	16	command and control, delivery, installation	dns, http, tls	2025-05-14
Fake Browser	12	exploitation	dns, tls, http	1615	command and control, delivery, exploitation	dns, http, tls	2025-05-16
Fake Service	3	delivery	dns, tls, http	163	actions on objectives, command and control, delivery, installation	dns, http, tcp, tls	2025-05-14
Gremlin Stealer	2	actions on objectives	http	2	actions on objectives	http	2025-05-14
Havoc	1	command and control	http	14	command and control	dns, http, tls	2025-05-16
Interlock Ransomware	2	command and control	tcp, http	2	command and control	tcp, http	2025-05-14
LandUpdate808	9	command and control	dns, tls, http	460	command and control, delivery	dns, http, tls	2025-05-17
Lumma	93	command and control, actions on objectives	dns, tls, http	5771	actions on objectives, command and control, delivery, installation	dns, http, tls	2025-05-16
NetSupport RAT	1	command and control	http	107	actions on objectives, command and control, exploitation, installation	dns, http, tls	2025-05-16
RAT Generic	3	command and control	tcp	270	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls, udp	2025-05-15
RATatouille	7	command and control	http, tcp	7	command and control	http, tcp	2025-05-14
RedExt	3	command and control, actions on objectives	http	3	command and control, actions on objectives	http	2025-05-14
SideWinder	15	command and control, delivery	dns, tls, http	428	actions on objectives, command and control, delivery	dns, http, tls	2025-05-17
SocGholish	18	command and control	dns, tls, http	1470	actions on objectives, command and control, delivery, exploitation, reconnaissance	dns, http, tcp, tcp-pkt, tls	2025-05-17
Stealer and Exfiltration	7	command and control, actions on objectives	http, dns, tcp-pkt, tls	464	actions on objectives, command and control, delivery, exploitation, installation	dns, ftp, http, smtp, tcp, tcp-pkt, tls	2025-05-14
Teal Kurma	3	command and control	dns, tls, http	43	command and control	dns, http, tls	2025-05-14
TerraStealer	4	command and control, actions on objectives	http	4	command and control, actions on objectives	http	2025-05-14
Unk	1	actions on objectives	http	158	actions on objectives, command and control, delivery, installation	dns, http, smtp, tcp, tls	2025-05-14
Unknown APT	208	command and control	dns, tls, http	467	command and control, delivery	dns, http, tls	2025-05-16
XWorm	48	command and control	tcp-pkt	3122	command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-05-17

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