Skip to main content

ACR Stealer — Security Threat Analysis Report By CyberDudeBivash | cyberdudebivash.com | cyberbivash.blogspot.com

 


Introduction

ACR Stealer is a rapidly growing infostealer malware family operating under a Malware-as-a-Service (MaaS) model. First observed in early 2024, it has since rebranded as Amatera Stealer, with new evasion features and better infrastructure.

Its targets include:

  • Windows users (Win7–Win11).

  • Web browsers: saved credentials, cookies, tokens.

  • Crypto wallets: private keys, clipboard hijacks.

  • Cloud & app configs: FTP, VPN, Telegram, Discord.

CyberDudeBivash breaks down distribution tactics, technical behavior, IoCs, and enterprise defenses.

 Infection & Delivery

  1. Phishing Campaigns

    • Fake Google Authenticator pages delivering ACR payloads.

    • Social engineering with “security update” lures.

  2. Cracked Software & Keygens

    • Bundled installers with stealer EXEs.

    • Popular lure: pirated Adobe, MS Office, VPN clients.

  3. Web Injects & SEO Poisoning

    • Malicious sites injected with stealer JS.

    • Fake download portals ranking on Google.

  4. Dead Drop Resolver (DDR)

    • Uses Google Docs, Steam, Telegram to store dynamic C2 info.

    • Helps avoid static IOC blacklists.

 Capabilities

ModuleFunction
Credential TheftChrome, Edge, Firefox, Brave, Opera stored creds.
Cookie HijackingSession cookies → bypass MFA.
Crypto Wallet TheftExodus, MetaMask, Atomic, Trust Wallet.
System ReconOS, hardware, installed apps.
Clipboard HijackCrypto wallet address replacement.
C2 CommsHTTP/S + DDR.
ObfuscationString encryption, anti-VM checks.

 Indicators of Compromise (IoCs)

  • Files: GoogleAuthSetup.exe, OfficePatch2025.exe.

  • Registry Keys:

    HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Amatera

  • C2 Behavior:

    • Access to Google Docs JSON blobs for config.

    • Outbound traffic to .top, .xyz domains.

 Risk Analysis

FactorLevelNotes
PrevalenceHighGrowing MaaS adoption.
StealthMedium-HighDDR, obfuscation.
ImpactVery HighIdentity theft, crypto loss, corporate breaches.
Target BaseWideFrom individuals → enterprises.

 CyberDudeBivash Defense Playbook

  1. Restrict Downloads

    • Block cracked/keygen software at gateways.

    • Filter suspicious download domains.

  2. Endpoint Protection (EDR/XDR)

    • Monitor for unauthorized access to browser credential stores.

    • Flag new processes accessing wallet directories.

  3. Network & Proxy Filtering

    • Detect outbound calls to Google Docs/Steam from unknown processes.

    • Block suspicious .top/.xyz C2.

  4. Identity Protection

    • Enforce MFA on all accounts.

    • Rotate credentials frequently.

  5. Threat Hunting Queries

    • Search for suspicious PowerShell decoders.

    • Detect processes writing into %AppData%\Roaming.

Highlighted Keywords

This article integrates:

  • Cyber insurance against credential theft

  • Zero Trust endpoint protection

  • Cloud identity and access management (IAM)

  • Next-gen Managed Detection & Response (MDR)

  • Advanced persistent threat (APT) emulation

  • Ransomware & infostealer incident response

  • Security awareness training

 Conclusion

ACR Stealer (Amatera) is an infostealer as a service making powerful credential theft accessible to even low-skill attackers.

Its use of Dead Drop Resolvers, cracked software campaigns, and phishing means defenders need multi-layered controls:

  • User education

  • EDR detection & SIEM hunts

  • Network blocking of DDR activity

CyberDudeBivash urges enterprises to treat stealers as initial access brokers (IABs) — one infection can lead to ransomware or espionage within hours.

 CyberDudeBivash Branding & CTA

Author: CyberDudeBivash
Powered by: CyberDudeBivash

cyberdudebivash.com | cyberbivash.blogspot.com
 Contact: iambivash@cyberdudebivash.com

 Download CyberDudeBivash Threat Intel Playbooks & Defense Apps: CyberDudeBivash Apps


#CyberDudeBivash #ACRStealer #Amatera #ThreatAnalysis #Infostealer #ZeroTrust #CyberInsurance #BugBounty #ThreatIntel

Labels:

Comments

Post a Comment

Popular posts from this blog

CVE-2025-5086 (Dassault DELMIA Apriso Deserialization Flaw) — Targeted by Ransomware Operators

  Executive Summary CyberDudeBivash Threat Intel is monitoring CVE-2025-5086 , a critical deserialization of untrusted data vulnerability in Dassault Systèmes DELMIA Apriso (2020–2025). Rated CVSS 9.0 (Critical) , this flaw allows remote code execution (RCE) under certain conditions.  The vulnerability is already included in CISA’s Known Exploited Vulnerabilities (KEV) Catalog , with reports of ransomware affiliates exploiting it to deploy payloads in industrial control and manufacturing environments. Background: Why DELMIA Apriso Matters Dassault DELMIA Apriso is a manufacturing operations management (MOM) platform used globally in: Industrial control systems (ICS) Smart factories & supply chains Manufacturing Execution Systems (MES) Because of its position in production and logistics workflows , compromise of Apriso can lead to: Disruption of production lines Data exfiltration of intellectual property (IP) Ransomware-enforced downtime V...
Post a Comment
Read more

Fal.Con 2025: Kubernetes Security Summit—Guarding the Cloud Frontier

  Introduction Cloud-native architectures are now the backbone of global services, and Kubernetes stands as the orchestration king. But with great power comes great risk—misconfigurations, container escapes, pod security, supply chain attacks. Fal.Con 2025 , happening this week, aims to bring together experts, security practitioners, developers, policy makers, and cloud providers around Kubernetes security, cloud protection, and threat intelligence . As always, this under CyberDudeBivash authority is your 10,000+ word roadmap: from what's being addressed at Fal.Con, the biggest challenges, tools, global benchmarks, and defense guidelines to stay ahead of attackers in the Kubernetes era.  What is Fal.Con? An annual summit focused on cloud-native and Kubernetes security , bringing together practitioners and vendors. Known for deep technical talks (runtime security, network policy, supply chain), hands-on workshops, and threat intel sharing. This year’s themes inc...
Post a Comment
Read more

Gentlemen Ransomware: SMB Phishing, Advanced Evasion, and Global Impact — CyberDudeBivash Threat Analysis

  Executive Summary The Gentlemen Ransomware group has quickly evolved into one of the most dangerous cybercrime collectives in 2025. First spotted in August 2025 , the group has targeted victims across 17+ countries with a strong focus on SMBs (small- and medium-sized businesses) . Their attack chain starts with phishing lures and ends with full-scale ransomware deployment that cripples organizations. CyberDudeBivash assesses that Gentlemen Ransomware’s tactics—including the abuse of signed drivers, PsExec-based lateral movement, and domain admin escalation —make it a critical threat for SMBs that often lack robust cyber defenses. Attack Lifecycle 1. Initial Access via Phishing Crafted phishing emails impersonating vendors, payroll systems, and invoice alerts. Credential harvesting via fake Microsoft 365 login pages . Exploitation of exposed services with weak authentication. 2. Reconnaissance & Scanning Use of Advanced IP Scanner to map networks. ...
Post a Comment
Read more