Office (OOXML) malware analysis — malicious · edb7f46c4cc2a301

MALICIOUS

Office (OOXML)

4.25 MB Created: 2018-02-02 15:10:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-05-29

MD5: bf3bd1b30e94957da1420dc2eb81ad21 SHA-1: 544b6a8153dcd300d0c13081dd7438773f4478b8 SHA-256: edb7f46c4cc2a301b1193630e0d56cc6ed23edd8de6f552f0e5a1721330930ce

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains an embedded OLE object with Ole10Native indicators, strongly suggesting an attempt to exploit CVE-2026-21514. This embedded object is identified as a download-and-execute script, which fetches a payload from the URL http://schemas.microsoft.com/SMI/2005/WindowsSettings. The presence of an executable payload further confirms its malicious intent.

Heuristics 5

Ole10Native package payload is a download-and-execute script critical OFFICE_PACKAGE_SCRIPT_DROPPER

The OLE Package's embedded payload contains a script that hosts a shell (PowerShell/WScript/mshta), fetches a remote resource, and executes it — a download-and-run dropper. Embedding such a script inside an Office document via the Object Packager is a direct user-execution delivery technique (MITRE T1204.002), not a benign attachment.
Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/markup-compatibility/2006 In document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/SMI/2005/WindowsSettingsEmbedded OLE package script

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin`	ooxml-ole-object	OOXML embedded OLE part: word/embeddings/oleObject1.bin	4497408 bytes
SHA-256: `ebc5534c092e6a45b6991011893fee26f6ecc5c16aa02a9009c20d0daea5273f`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.52, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	4459901 bytes
SHA-256: `f567cf91f10d3937bb5ab75ce883921b907327e49cdeadb2b4277237c306f397`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.69, consistent with packed or encrypted content.
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image1.emf	1044848 bytes
SHA-256: `9f13e88e70ea76804dc9763122bc00a255f594bc23bc7556911eb28dfdf778da`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: heap spray 0x07

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