UPX
E82617
UPX is an executable packer and compressor commonly used to reduce the size of binary programs.
All labels observed (4)
| Label | Occurrences |
|---|---|
| UPX canonical | 14 |
| Ultimate Packer for Executables | 5 |
| Ultimate Packer for eXecutables | 3 |
| UPX executable packer | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T660658 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: UPX Context triple: [UPP, distinguishedFrom, UPX]
-
A.
Zip2
Zip2 was an early online city guide and business directory software company from the late 1990s that provided web-based publishing tools for newspapers.
-
B.
F Reactor
F Reactor was one of the early plutonium production reactors at the Hanford Site in Washington, built during the Manhattan Project to support the U.S. nuclear weapons program.
-
C.
SRWare Iron
SRWare Iron is a Chromium-based web browser focused on enhancing user privacy and security by removing or disabling various tracking and data-collection features found in Google Chrome.
-
D.
Confinity
Confinity was a software company co-founded by Max Levchin, Peter Thiel, and others that developed digital payment technology and later merged with X.com to form PayPal.
-
E.
B Reactor
B Reactor is the world’s first full-scale plutonium production reactor, built during the Manhattan Project at the Hanford Site in Washington State.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: UPX Target entity description: UPX is an executable packer and compressor commonly used to reduce the size of binary programs.
-
A.
Zip2
Zip2 was an early online city guide and business directory software company from the late 1990s that provided web-based publishing tools for newspapers.
-
B.
F Reactor
F Reactor was one of the early plutonium production reactors at the Hanford Site in Washington, built during the Manhattan Project to support the U.S. nuclear weapons program.
-
C.
SRWare Iron
SRWare Iron is a Chromium-based web browser focused on enhancing user privacy and security by removing or disabling various tracking and data-collection features found in Google Chrome.
-
D.
Confinity
Confinity was a software company co-founded by Max Levchin, Peter Thiel, and others that developed digital payment technology and later merged with X.com to form PayPal.
-
E.
B Reactor
B Reactor is the world’s first full-scale plutonium production reactor, built during the Manhattan Project at the Hanford Site in Washington State.
- F. None of above. chosen
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf |
executable compressor
ⓘ
executable packer ⓘ |
| abbreviationOf |
Ultimate Packer for eXecutables
ⓘ
linked to:
UPX
|
| codeRepository | https://github.com/upx/upx ⓘ |
| compressionMethod |
LZMA-based algorithms
ⓘ
UCL-based algorithms ⓘ |
| distributionModel | free software ⓘ |
| fullName |
Ultimate Packer for eXecutables
ⓘ
linked to:
UPX
|
| hasFeature |
ability to decompress previously packed files
ⓘ
ability to strip debug information ⓘ command-line interface ⓘ configurable compression levels ⓘ lossless executable compression ⓘ on-the-fly decompression at runtime ⓘ optional backup of original file ⓘ support for multiple executable formats ⓘ support for overlays in some formats ⓘ support for relocation and import tables in executables ⓘ test mode for verifying compressed executables ⓘ |
| initialReleaseYear | 1996 ⓘ |
| license | GNU General Public License ⓘ |
| licenseVersion | GPL-2.0-or-later ⓘ |
| notableFor |
fast decompression speed
ⓘ
frequent use by malware to pack payloads ⓘ high compression ratio for executables ⓘ wide adoption in software distribution ⓘ |
| operatingSystem | cross-platform ⓘ |
| originalAuthor |
John Reiser
ⓘ
Laszlo Molnar ⓘ Markus Oberhumer ⓘ |
| primaryFunction |
compress executable files
ⓘ
decompress executable files ⓘ |
| programmingLanguage |
C
ⓘ
C++ ⓘ |
| runsOn |
Linux
ⓘ
Windows ⓘ macOS ⓘ |
| securityConsideration |
many antivirus tools implement UPX unpacking
ⓘ
packed binaries may evade simple static analysis ⓘ |
| softwareGenre | executable compression software ⓘ |
| sourceModel | open source ⓘ |
| supportsOperation |
compression of DOS executables
ⓘ
compression of Linux ELF executables ⓘ compression of Windows PE executables ⓘ compression of macOS Mach-O executables ⓘ compression of various firmware formats ⓘ in-place executable compression ⓘ in-place executable decompression ⓘ |
| useCase |
obfuscate executable contents to some extent
ⓘ
reduce disk space usage of executables ⓘ reduce download size of programs ⓘ reduce size of binary programs ⓘ |
| website | https://upx.github.io/ ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: UPX Description of subject: UPX is an executable packer and compressor commonly used to reduce the size of binary programs.
Referenced by (23)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: UPX
linked to: UPX
linked to: UPX
linked to: UPX
linked to: UPX
subject linked to:
Laszlo Molnar
linked to: UPX
subject linked to:
John Reiser