Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 09bb05993d9f6524…

MALICIOUS

Office (OOXML)

432.5 KB Created: 2017-05-30 12:22:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2019-01-11
MD5: ec0086bc7621fb3865d46a4d0775320b SHA-1: 38bbdf46b92c7ccdaa01c3bd6291f41793d4f3e8 SHA-256: 09bb05993d9f6524bb081fd2f6974edca2f7a40fdd10e3466472cd04e4120577
162 Risk Score

Malware Insights

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

The sample contains an embedded OLE object with indicators of a malicious payload, specifically identified as a potential CVE-2026-21514 exploitation attempt. This heuristic, combined with the detection of a risky file type within the OLE package (an .lnk file), strongly suggests the document is designed to execute arbitrary code upon opening. The ClamAV detection further confirms its malicious nature, likely related to phishing.

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 5632 bytes
SHA-256: a448ce68dd06f7a34c9c211bb651e6f7025dcced27d3449ab84190b1ffc9620b
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 3217 bytes
SHA-256: 3a0211835dab0bb21130575c0d6b8b503e829b7b1ecce00fa07333f23df250c7
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5440 bytes
SHA-256: 0f369ecc971467d3072be736a4f62fab6b70534998d3aa11ad0722ad23af99b2

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