Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d436fbec35570c74…

MALICIOUS

Office (OOXML)

205.3 KB Created: 2014-07-16 16:36:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-06-17
MD5: d8f0fab30eae91687c0d80f8dd08218f SHA-1: 2383abe1f9d58909b91ddb11c9f6188a514a3f15 SHA-256: d436fbec35570c74478d7f699f379d2abb688acc7e4d211335880bf3a6809695
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The sample is a malicious OOXML document containing an embedded OLE object with executable content, strongly indicating exploitation of CVE-2026-21514. ClamAV detections confirm the presence of a known trojan. The embedded OLE object is designed to drop and execute a payload, likely leading to further compromise.

Heuristics 5

  • ClamAV: Win.Trojan.7535757-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.7535757-1
  • 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
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: http://www.lipsum.com/
  • 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)
    • http://www.lipsum.com/Document hyperlink

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 392192 bytes
SHA-256: fd6c513721ebaef20b824c08fa8526ac1c842c9d5f172df2b3d832cb8592008b
Detection
ClamAV: Win.Trojan.7535757-1
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 381309 bytes
SHA-256: 8265222da43908d849be6138c339e7c4989ae5ea1dedfd8e5f6e994bd76c44dc
Detection
ClamAV: Win.Trojan.7535757-1
Obfuscation or payload: unlikely
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5004 bytes
SHA-256: 53dce0973b28cb1c25e43ca91700e9e07513992312c4fcb0c7267a532d01c986

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