Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 398d1fc0f2c91324…

MALICIOUS

Office (OOXML)

1.17 MB Created: 2018-03-05 17:56:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-05-22
MD5: 7b00a6b0a1b6137b303a6e7b9bb17fae SHA-1: 448cdd4aae2c48abc2ba5976c837cb69c6a653e3 SHA-256: 398d1fc0f2c913244f0324eb3bccb5930e34fcf76436c44e80844810b09df8f2
84 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1129 Execution through API

The sample is a malicious OOXML document containing an embedded OLE object with indicators of a dropped executable payload. This strongly suggests an exploitation attempt, likely CVE-2026-21514, to execute a secondary stage. The embedded OLE object and its Ole10Native wrapper 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 1500672 bytes
SHA-256: 9fd7dd1b9a1e43386cc2c987d0afc8a988acf61552905876d80e28ad7ec0ad26
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 1486582 bytes
SHA-256: 38f8bff3a93ea69dcea0e46f82336ef368b2cd9257a456106dedd50961a0e65d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5504 bytes
SHA-256: 285ce56522a015931b6c2b6be3bc6b79eaa8fe348a4aae745d6d2813028bb1f9

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