Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b703b2991cfff6f1…

MALICIOUS

Office (OOXML)

709.9 KB Created: 2015-02-12 07:21:00 UTC Authoring application: 14.0000 First seen: 2018-06-21
MD5: e5765ebfdbe441e444d30ae804f9e01b SHA-1: 9e3c2037ad2f0926b9940ea606df0836f1224826 SHA-256: b703b2991cfff6f123a666404b911a3ef94190ba688bc11de3ac93e4bfcafe1b
84 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object with indicators of a dropped executable payload. This strongly suggests exploitation of a vulnerability, likely CVE-2026-21514, to achieve client-side execution. The embedded OLE object and its native Ole10Native component are the primary indicators of this malicious behavior.

Heuristics 4

  • 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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In 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.microsoft.com/office/word/2010/wordprocessingDrawingIn 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/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 861184 bytes
SHA-256: bbf93a166d1721d166857dbc6997974312211a430e785a18266c0e0e5ebe6a24
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.88, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 851759 bytes
SHA-256: a2e9f18520515099ab12fe85b9dcac0ddb0d81cb72a0b1c40bc2341199eb546e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.90, consistent with packed or encrypted content.
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5368 bytes
SHA-256: c42f86e7bcb45706f97cb949feb866240b4e4f652f2b7ef6a87a9a5a7dc54ff2

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