Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c61a5e8dc323fce6…

MALICIOUS

Office (OOXML)

491.7 KB Created: 2017-07-24 17:05:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2019-01-11
MD5: f80a80d25b3393825baa1e84e76ddf6c SHA-1: 8e529c1cf50fa2782994d894622b8ee4a7852fa4 SHA-256: c61a5e8dc323fce6435b2f0ea45391893e2bb495a682862c2f101017d80ec37c
162 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing an embedded OLE object with indicators for executable content and a remote link, strongly suggesting exploitation of CVE-2026-21514. The embedded JavaScript, though obfuscated, likely attempts to download and execute a second-stage payload. The ClamAV detection 'Win.Phishing.Suspicious-6355520-3' further supports a phishing or malware delivery role.

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: e23c7b24f862ff3db170b3020e29bff4bedc2c7e932f19837ca0c18363ff8c6b
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2475 bytes
SHA-256: cb73247d6135d30aa020a624b9155a20d0e613259e0a49b9b2422ea964d4f591
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5440 bytes
SHA-256: fd18bf3c032ff48938367ed7dcb2db906a7a84736585e82829969e98b46b3d8d

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