Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b13440aa97ace00e…

MALICIOUS

Office (OOXML)

548.6 KB Created: 2017-07-17 11:25:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2019-04-17
MD5: 499ebef3ab31a2f98fc8a358bd085b0f SHA-1: 56deebbe61656ac514ee7f80ae702329abc7fe8b SHA-256: b13440aa97ace00e812610c1cb86c4da60335614b2cb673cd524224e465752f1
162 Risk Score

Malware Insights

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

The file is identified as malicious due to the presence of an embedded OLE object with executable indicators, specifically a .lnk file, which is a strong indicator of CVE-2026-21514 exploitation. ClamAV also detected it as Win.Phishing.Suspicious-6355520-3. The embedded JavaScript, though truncated, contains obfuscated code and attempts to manipulate console output, suggesting it's part of a malicious script designed to download and execute a secondary payload.

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.
  • ClamAV: Win.Phishing.Suspicious-6355520-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Phishing.Suspicious-6355520-3
  • Ole10Native package carries executable/script file type high OFFICE_PACKAGE_RISKY_FILE
    OLE Package displayName or fullPath ends in an executable or script-capable extension. Even without UI extension spoofing, embedding a runnable payload inside an Office document is a high-risk delivery pattern.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • 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/2012/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 4608 bytes
SHA-256: 5c8514914290077bcb5e90ab9f658e54826acb20c4a7bd01bb3e71ee8c5c133d
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2441 bytes
SHA-256: c2dae3d277991d1e4903164bf0ee9285b731ac5c4270bf0f0ca7c3972e7ca963
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5440 bytes
SHA-256: 768dbb3555ccb0d2520f9fee9638d9a627f0876f0f4d62e3219e184355559344

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