aeondave/upx
offensive-tools/rev/upx/SKILL.md
UPX: executable packer and unpacker for PE, ELF, Mach-O, and several embedded formats. Use when you need to unpack a UPX-packed sample for analysis, verify whether a binary is compressed, or repack a controlled payload for lab use and size reduction.
$ install --global
skillsauthnpx skillsauth add aeondave/malskill upxInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: May 19, 2026, 4:57 AM150.9s1 file scanned
SKILL.md
- name:
- upx
- description:
- UPX: executable packer and unpacker for PE, ELF, Mach-O, and several embedded formats. Use when you need to unpack a UPX-packed sample for analysis, verify whether a binary is compressed, or repack a controlled payload for lab use and size reduction.
- compatibility:
- Linux, Windows, macOS; standalone binary; supports many executable formats
- author:
- AeonDave
- version:
- 1.0
UPX
Practical executable packing. In reversing, it is usually the wrapper you remove before the real work begins.
When to use UPX
Use UPX when you need to:
- detect and unpack standard UPX-packed malware or challenge binaries
- inspect packing status and compression metadata quickly
- repack a controlled binary for transport or lab exercises
Quick Start
# Inspect packing info
upx -l sample.bin
# Unpack in place
upx -d sample.bin
# Write unpacked output elsewhere
upx -d sample.bin -o sample.unpacked
High-Value Workflows
Unpack before analysis
upx -d sample.bin
file sample.bin
strings -n 8 sample.bin
Controlled repack for lab artifacts
upx -9 tool.bin
upx --best --lzma tool.bin
Practical Notes
- Always hash before and after unpacking so later evidence chains stay clean.
- After unpacking, re-run
file,readelf,objdump, andstringsbecause the sample's surface changes dramatically. - If
upx -dfails, the target may be modified, corrupted, or only UPX-like.
Caveats
- Not every packed sample is unpackable with stock UPX.
- Repacking changes file hashes and may trigger different runtime behavior in security tooling.
- UPX support varies by target format and version; read the tool's error messages carefully.
Resources
No bundled scripts/, references/, or assets/.
Use the official UPX docs for supported formats, compression modes, and troubleshooting.
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