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: 1462

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]: 5 (TA2727, Filch Stealer, Prince Ransomware, Nimbus Manticore APT, Potentially unwanted software)
Major changes to detections(s) [2]: 179
Updated threat detection(s) [3]: 203

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:

TA2727 (APT)

Cybercriminal group TA2727 collaborates with others for financial gain, purchasing online traffic to disseminate malware. Proofpoint identified them in an attack campaign delivering malicious payloads via compromised websites in North America.

Total number of detection methods: 12
Kill chain phase(s): command and control

Filch Stealer (Data Theft)

Rapid7 has detected a rise in incidents involving domain generation algorithms, leading to the deployment of a sophisticated infostealer known as Filch Stealer that targets crypto-related applications and wallets.

Total number of detection methods: 4
Kill chain phase(s): command and control
MITRE ATT&CK: T1005

Prince Ransomware (Ransomware)

Prince ransomware is written in Go and uses ChaCha20 and ECIES cryptography to encrypt files securely, making them unrecoverable by traditional tools. Decryption can only be done with a specific decryptor.

Total number of detection methods: 3
Kill chain phase(s): installation
MITRE ATT&CK: T1486

Nimbus Manticore APT (APT)

Nimbus Manticore is a sophisticated Iran-linked APT group targeting aerospace and defense organizations with customized implants like Minibike/SugResin. Recent variants show enhanced capabilities and evasion techniques.

Nimbus Manticore APT - Malpedia |

Total number of detection methods: 5
Kill chain phase(s): command and control, actions on objectives
MITRE ATT&CK: T1005, 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):

ClearFake (Exploit Kit)

Malicious fake updates campaign infecting hundreds of websites with ClearFake malware, starting around July 19th, 2023. No tracking of visits by IP or cookies, leading to easier detection by analysts and site owners.

Added kill chain phase(s): exploitation
Previously supported kill chain phase(s): command and control, exploitation
MITRE ATT&CK added: T1105
Previously existing MITRE ATT&CK: T1071, T1189
Methods added: 1

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

FrigidBackdoor (Data Theft)

Proofpoint researchers identified two new threat actors, TA2726 and TA2727, who are traffic sellers and malware distributors involved in various web-based attacks, including delivering a new Mac information stealer called FrigidStealer.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): delivery, command and control, actions on objectives
MITRE ATT&CK added: T1071
Previously existing MITRE ATT&CK: T1189, T1041, T1071
Methods added: 1

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): delivery
Previously supported kill chain phase(s): command and control, delivery, actions on objectives
MITRE ATT&CK added: T1496, T1105
Previously existing MITRE ATT&CK: T1071, T1566
Methods added: 2

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, actions on objectives
MITRE ATT&CK added: T1189
Previously existing MITRE ATT&CK: T1189, T1105, T1071
Methods added: 8

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: 3

Molerats (APT)

The politically-motivated threat group Molerats has been active since 2012 targeting victims in the Middle East, Europe, and the US according to reports by MITRE.

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, T1590, T1071, T1587, T1102
Methods added: 7

Mustang Panda (APT)

Mustang Panda is a China-based cyber threat actor observed since 2017, possibly operating since 2014. It targets government and non-government organizations in multiple countries like the U.S., Germany, and Myanmar.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control, delivery
Methods added: 33

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

Oyster (Backdoor)

Oyster is a new loader and backdoor first seen in September 2023. It comprises two executables: Oyster Installer and Oyster Main, used by former WIZARD SPIDER affiliates.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control
MITRE ATT&CK added: T1041, T1071
Previously existing MITRE ATT&CK: T1071, T1189, T1041
Methods added: 32

PureCrypter (Loader)

Introduction of PureCrypter loader, active this year promoting over 10 families, using hundreds of C2s. Detailed sample analysis by zscaler focuses on communication activities and operation process of PureCrypter.

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): delivery, command and control
MITRE ATT&CK added: T1095, T1071
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: 3

ReverseLoader (Loader)

Loaders are basic remote access Trojans allowing attackers to control compromised computers or bots. They are traditionally lightweight to avoid detection, but can evolve with added features for cybercriminals.

Added kill chain phase(s): installation
Previously supported kill chain phase(s): delivery, command and control
MITRE ATT&CK added: T1105
Previously existing MITRE ATT&CK: T1105
Methods added: 2

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
Previously supported kill chain phase(s): command and control, delivery, actions on objectives, exploitation
Methods added: 2

TA2726 (APT)

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

Added kill chain phase(s): command and control
Previously supported kill chain phase(s): command and control
Methods added: 6

TA4903 (APT)

Advanced persistent threats (APTs) are stealthy threat actors, often nation states or state-sponsored groups, who gain unauthorized access to networks for political or economic motivations, utilizing various tactics to remain undetected.

Added kill chain phase(s): delivery
Previously supported kill chain phase(s): delivery
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): delivery, 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, T1566, T1102
Methods added: 45

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
ClearFake	1	exploitation	http	226	command and control, exploitation	dns, http, tls	2025-09-30
Fake Browser	3	exploitation	dns, tls, http	1742	command and control, delivery, exploitation	dns, http, tls	2025-09-30
Filch Stealer	4	command and control	tcp-pkt, dns, tls, http	4	command and control	tcp-pkt, dns, tls, http	2025-09-30
FrigidBackdoor	1	command and control	http	7	actions on objectives, command and control, delivery	http	2025-09-30
Generic Loader	2	delivery	http	145	actions on objectives, command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-09-30
LandUpdate808	8	command and control	dns, tls, http	595	actions on objectives, command and control, delivery	dns, http, tls	2025-10-04
Lumma	3	command and control, actions on objectives	dns, tls, http	6883	actions on objectives, command and control, delivery, installation	dns, http, tls	2025-09-30
Molerats	7	command and control	http, dns, tls	331	command and control, delivery	dns, http, tcp, tls	2025-10-01
Mustang Panda	33	command and control	dns, tls, http	222	command and control, delivery	dns, http, tcp, tls	2025-10-01
NetSupport RAT	1	command and control	http	157	actions on objectives, command and control, exploitation, installation	dns, http, tls	2025-10-01
Nimbus Manticore APT	5	command and control, actions on objectives	http, dns, tls	5	command and control, actions on objectives	http, dns, tls	2025-09-30
Oyster	32	command and control	dns, tls, http	108	command and control	dns, http, tls	2025-10-04
Prince Ransomware	3	installation	http	3	installation	http	2025-09-30
PureCrypter	3	command and control	tcp	12	command and control, delivery	http, tcp	2025-10-02
RAT Generic	3	command and control	tcp	309	actions on objectives, command and control, delivery, installation	dns, http, tcp, tcp-pkt, tls, udp	2025-10-04
ReverseLoader	2	installation	http	14	command and control, delivery, installation	dns, http, tls	2025-09-30
SideWinder	2	command and control	dns, http	526	actions on objectives, command and control, delivery, exploitation	dns, http, tls	2025-09-30
TA2726	6	command and control	dns, tls, http	159	command and control	dns, http, tls	2025-10-03
TA2727	12	command and control	dns, tls, http	12	command and control	dns, tls, http	2025-09-30
TA4903	3	delivery	dns, tls, http	2426	delivery	dns, http, tls	2025-10-01
Unknown APT	45	delivery, command and control	dns, tls, http	1217	command and control, delivery	dns, http, tcp, tls	2025-09-30
XWorm	24	command and control	tcp-pkt	4053	command and control, delivery	dns, http, tcp, tcp-pkt, tls	2025-10-04

Additional Resources

Technical support
Join the conversation on Discord
Follow us Twitter
Follow us on LinkedIn
Subscribe to our YouTube channel
Stamus Networks website

Threat Detection Update