Office (OOXML) malware analysis — malicious · 8d1940f7577cb7f1

MALICIOUS

Office (OOXML)

598.2 KB Created: 2018-05-29 08:25:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2019-08-04

MD5: 73724d527ee5214c80f1a997f8f9969e SHA-1: 8a8f7a9cee94d4c4fe618ee9c820645d61274364 SHA-256: 8d1940f7577cb7f1fdca3f25996f0e878e106e135ed64a219740140b86b2687f

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1129 Shared Content

The sample is a Microsoft Office document containing an embedded OLE object. Heuristics indicate this object is likely an executable payload, potentially exploiting CVE-2026-21514. The embedded OLE object and associated extracted files suggest the document is designed to deliver and execute a secondary malicious payload upon opening.

Heuristics 5

OOXML Ole10Native with payload/link indicators — possible CVE-2026-21514 high CVE likely CVE_2026_21514

Office document contains embedded OLE (word/embeddings/oleObject1.bin) with Ole10Native plus executable, PE, or risky remote-link indicators. This is a likely CVE-2026-21514 exploitation shape.
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 info 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)

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	647168 bytes
SHA-256: `0381562d36c5e49fad93f91b5703aca9f0645f0e655faeeb7c41adda0cb630d1`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	639615 bytes
SHA-256: `f7ff39e5e769fa4146d36d0ce470b7762a3f70fc874cd4bba3381d77347ffeda`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image1.emf	5560 bytes
SHA-256: `fc28142502dc6a6085b36ae26e4132d48b14b204c631f64f65d331d447e66de5`

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