SANS Stormcast Tuesday, October 21st, 2025: Syscall() Obfuscation; AWS down; Beijing Time Attack

Update: 2025-10-20

Description

Using Syscall() for Obfuscation/Fileless Activity

Fileless malware written in Python can uses syscall() to create file descriptors in memory, evading signatures.

https://isc.sans.edu/diary/Using%20Syscall%28%29%20for%20Obfuscation%20Fileless%20Activity/32384

AWS Outages

AWS has had issues most of the day on Monday, affecting numerous services.

https://health.aws.amazon.com/health/status

Time Server Hack

China reports a compromise of its time standard servers.

https://thehackernews.com/2025/10/mss-claims-nsa-used-42-cyber-tools-in.html

Comments

In Channel

SANS Stormcast Wednesday, October 22nd, 2025: NTP Pool; Xubuntu Compromise; Squid Vulnerability; Lanscope Vuln;

2025-10-2206:37

SANS Stormcast Tuesday, October 21st, 2025: Syscall() Obfuscation; AWS down; Beijing Time Attack

2025-10-2009:17

SANS Stormcast Monday, October 20th, 2025: Malicious Tiktok; More Google Ad Problems; Satellite Insecurity

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SANS Stormcast Friday, October 17th, 2025: New Slack Workspace; Cisco SNMP Exploited; BIOS Backdoor; @sans_edu reseach: Active Defense

2025-10-1721:28

SANS Stormcast Thursday, October 16th, 2025: Clipboard Image Stealer; F5 Compromise; Adobe Updates; SAP Patchday

2025-10-1508:40

SANS Stormcast Wednesday, October 15th, 2025: Microsoft Patchday; Ivanti Advisory; Fortinet Patches

2025-10-1406:22

SANS Stormcast Tuesday, October 14th, 2025: ESAFENET Scans; Payroll Priates; MSFT Edge IE Mode

2025-10-1306:02

SANS Stormcast Monday, October 13th, 2025: More Oracle Patches; Sonicwall Compromisses; Unpatched Gladinet; 7-Zip Patches

2025-10-1205:56

SANS Stormcast Friday, October 10th, 2025: RedTail Defenses; SonicWall Breach; Crowdstrike “Issues”; Ivanti 0-days; Mapping Agentic Attack Surface (@sans_edu paper)

2025-10-1015:12

SANS Stormcast Thursday, October 9th, 2025: Polymorphic Python; ssh ProxyCommand Vuln;

2025-10-0906:12

SANS Stormcast Wednesday, October 8th, 2025: FreePBX Exploits; Disrupting Teams Threats; Kibana and QT SVG Patches

2025-10-0805:57

SANS Stormcast Tuesday, October 7th, 2025: More About Oracle; Redis Vulnerability; GoAnywhere Exploited

2025-10-0705:33

SANS Stormcast Monday, October 6th, 2025: Oracle 0-Day

2025-10-0606:28

SANS Stormcast Friday, October 3rd, 2025: More .well-known Scans; RedHat Openshift Patch; TOTOLINK Vuln;

2025-10-0306:35

SANS Stormcast Thursday, October 2nd, 2025: Honeypot Passwords; OneLogin Vuln; Breaking Intel SGX; OpenSSL Patch

2025-10-0208:11

SANS Stormcast Wednesday, October 1st, 2025: Cookie Auth Issues; Western Digtial Command Injection; sudo exploited;

2025-10-0105:10

SANS Stormcast Tuesday, September 30th, 2025: Apple Patch; PAN Global Protect Scans; SSL.com signed malware

2025-09-3005:06

SANS Stormcast Monday, September 29th, 2025: Convert Timestamps; Cisco Compromises; GitHub Notification Phishing

2025-09-2908:36

SANS Stormcast Friday, September 26th, 2025: Webshells in .well-known; Critical Cisco Vulns Exploited; XCSSET Update; GoAnywhere MFT Exploit Details

2025-09-2605:24

SANS Stormcast Thursday, September 25th, 2025: Hikvision Exploits; Cisco Patches; Sonicawall Anit-Rootkit Patch; Windows 10 Support

2025-09-2505:33

00:00

SANS Stormcast Tuesday, October 21st, 2025: Syscall() Obfuscation; AWS down; Beijing Time Attack

#box-pro-ellipsis-176111220653371{-webkit-line-clamp:2;}SANS Stormcast Tuesday, October 21st, 2025: Syscall() Obfuscation; AWS down; Beijing Time Attack

SANS Stormcast Tuesday, October 21st, 2025: Syscall() Obfuscation; AWS down; Beijing Time Attack

Dr. Johannes B. Ullrich

SANS Stormcast Tuesday, October 21st, 2025: Syscall() Obfuscation; AWS down; Beijing Time Attack