Manual B64 Decode Pwsh

Date: 2025-10-23 ID: 2d2d0452-1d37-4f73-8e58-c2f0c57de465 Author: Nasreddine Bencherchali, Splunk Environment: attack_range Directory: manual_b64_decode_pwsh

Description

Generated datasets covering the manual Base64 decoding using PowerShell.

MITRE ATT&CK Techniques

ID	Technique	Tactic
T1027.010	Command Obfuscation	Defense Evasion

Environment Details

Field	Value
Environment	attack_range
Directory	manual_b64_decode_pwsh
Test Date	2025-10-23

Datasets

The following datasets were collected during this attack simulation:

Nirsoft_file_bundle_created.log

Path: /datasets/attack_techniques/T1027.010/manual_b64_decode_pwsh/manual_b64_decode_pwsh.log
Sourcetype: XmlWinEventLog
Source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational

The following detections in our security content repository use this attack data for testing:

Detection Name	Type	Source	MITRE ATT&CK	Analytic Story
Windows PowerShell Process Implementing Manual Base64 Decoder	`Anomaly`	Endpoint	T1027.010, T1059.001	Compromised Windows Host, Deobfuscate-Decode Files or Information

Usage Instructions

Replay with Splunk Attack Data

Replay attack data with replay.py from Splunk Attack Data.

1python replay.py --dataset /datasets/attack_techniques/T1027.010/manual_b64_decode_pwsh/manual_b64_decode_pwsh.log --index attack_data

Manual Import

Download the dataset files from the paths listed above
Configure your Splunk instance with the appropriate sourcetypes
Import the logs using the Splunk Add Data wizard

Find more detections and analytics for this attack technique in our security content repository.

Source: GitHub | Version: 1.0