Jörg Backschues

Making IT Infrastructure (in)visible, #network, #security, #email, #dns, off time #hiking & #cycling, member @FFRhein, @DENOGnews, @WikimediaDE, JM2C only

[LetsDefend @LetsDefendIO]

Authentication Methods

[FalconFeeds.io @FalconFeedsio]

📢 Ransomware Alert: 🇩🇪

BMW (https://t.co/1s2rIpvAkE), has reportedly fallen victim to the Everest ransomware group.

[Tom Dörr @tom_doerr]

scan websites for endpoints, secrets, api keys, and more

[TechOps Examples @techopsexamples]

Cloud Network Components Cheat Sheet: AWS vs. Azure vs. GCP 👇

Network components form the backbone of cloud infrastructure, enabling connectivity, scalability, and functionality in cloud services.

We've simplified this for you.

55K+ read my DevOps and Cloud newsletter: https://t.co/wwkI6UOSo4

What do we cover:
DevOps, Cloud, Kubernetes, IaC, GitOps, MLOps

🔁 Consider a Repost if this is helpful

[Elorm Daniel @elormkdaniel]

OSI Model Clearly Explained

The OSI model is a fundamental framework for understanding how network interactions occur.

It comprises seven distinct layers, each with its own roles and responsibilities, working together to facilitate communication across systems and devices.

𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗹𝗮𝘆𝗲𝗿 (𝗟𝟳)

Interfaces directly with end-user applications to provide network services. It manages application-level protocols like HTTP, FTP, and SMTP, which enable services such as web browsing and email.

𝗣𝗿𝗲𝘀𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 𝗹𝗮𝘆𝗲𝗿 (𝗟𝟲)

Translates data between network and application formats. It manages data encryption, compression, and formatting. It maintains system interoperability by ensuring data is readable by both the sender and the recipient.

𝗦𝗲𝘀𝘀𝗶𝗼𝗻 𝗹𝗮𝘆𝗲𝗿 (𝗟𝟱)

This layer manages the creation, maintenance, and termination of communication sessions between applications for efficient data transfer. Supports full-duplex and half-duplex communication to ensure proper sequencing and coordination in multi-way exchanges.

𝗧𝗿𝗮𝗻𝘀𝗽𝗼𝗿𝘁 𝗹𝗮𝘆𝗲𝗿 (𝗟𝟰)

It coordinates end-to-end communication by delivering data to the correct application through ports, using either reliable delivery (TCP) or unreliable but faster methods (UDP). Error checking, flow control, and segmentation are used in the transport layer to achieve reliable data transfer.

𝗡𝗲𝘁𝘄𝗼𝗿𝗸 𝗹𝗮𝘆𝗲𝗿 (𝗟𝟯)

Handles data routing, forwarding and addressing, determining the optimal path for data to reach its destination using protocols like IP and ICMP.

𝗗𝗮𝘁𝗮 𝗹𝗶𝗻𝗸 𝗹𝗮𝘆𝗲𝗿 (𝗟𝟮)

Facilitates reliable data transfer across physical network links. Provides error detection and correction. Manages how data is placed onto the network medium. Uses protocols like Ethernet and PPP.

𝗣𝗵𝘆𝘀𝗶𝗰𝗮𝗹 𝗹𝗮𝘆𝗲𝗿 (𝗟𝟭)

This layer forms the foundation of the OSI model, converting raw bitstreams into signals for transmission over physical media. It defines the hardware specifications for transmission, including the types of physical media that can be used, such as cables and wireless. It deals with electrical signals, cable types, and data rates.

The OSI model is grounded in principles that support structured and predictable data movement.

Each layer operates independently, simplifying design and troubleshooting.

Data is encapsulated with headers as it moves down the layers and decapsulated as it ascends, preserving information integrity.

By standardizing communication, this framework promotes system interoperability and supports global data exchange.

~~

[LetsDefend @LetsDefendIO]

OSI Model 101

[Elorm Daniel @elormkdaniel]

Network Commands for Windows

[Igor Chubin @igor_chubin]

chmod calculator with curl:

curl https://t.co/KQzjv038b6

[LetsDefend @LetsDefendIO]

How SIEM Works?

[Rakesh Jain @devops_tech]

Understanding sudo, su, su - and sudo su !

A Thread with examples 👇

[Maddy 🐝 @Cyb3rMaddy]

maybe watch it when you're traveling to a certain hacker con..?

OUT NOW: https://t.co/MMVL2YiB5n

[Dan Nanni @xmodulo]

Switch ports can be categorized as trunk or access ports. Trunk ports handle traffic from multiple VLANs, while access ports typically carry traffic for only one VLAN 😎👇 #sysadmin #ccnp

Find pdf books with all my #networking related infographics at https://t.co/3t6LHw8TIY

[Tom Dörr @tom_doerr]

curated list of Flipper Zero tools, tips, and resources

[abuse.ch @abuse_ch]

We've observed an interesting infection chain ⛓️ in the wild, starting with #LummaStealer spread through a fake gaming website and resulting in #Latrodectus and #SectopRat 🪲🔍👀

Infection starts with the user visiting a website offering free game downloads, where they are redirected and prompted to download a password-protected zip file from mega[.]nz ⚠️

When the user executes the file, Lumma is executed in a new process, which later downloads Latrodectus and SectopRAT:

Latrodectus payload URL:
🌐 https://t.co/f26oGGGHSU

SectopRAT payload URL:
🌐 https://t.co/jIKVBRfOFL

Latrodectus config 🗜️:
CampaignID: Callisto
Direction: 3
Version: 2.2

IOCs:
📡 https://t.co/wjSG3ShXM3
📡 https://t.co/7OgTaPjzO0

Malware samples:
📄 https://t.co/YsBVuCSPGt
📄 https://t.co/jYPnh1KXbl
📄 https://t.co/KeCnyiM7eB

[TRÄW🤟 @thatstraw]

SPF protocol explained:

[TRÄW🤟 @thatstraw]

DMARC Protocol explained

[sysxplore @sysxplore]

DNS protocol explained

[sysxplore @sysxplore]

DMARC Protocol explained

[LetsDefend @LetsDefendIO]

Firewall 101