Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 effacc334a966f07…

MALICIOUS

Office (OOXML)

1.71 MB Created: 2020-04-15 08:03:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2020-07-24
MD5: c4973bbb60be7037ef69ee512dce2842 SHA-1: 8bc511a438fdc0c7328178f9627f4fbc32e22d53 SHA-256: effacc334a966f078dc34645cc205a46e2817c411c5f996ab77ad5b081caef73
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1134.001 Access Token Manipulation: Token Impersonation/Theft

The file is a malicious Microsoft Office document containing an embedded OLE object with indicators of a dropped executable payload. This strongly suggests exploitation of a vulnerability like CVE-2026-21514 to achieve code execution upon opening. The embedded OLE object is the primary indicator of compromise.

Heuristics 3

  • 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
  • 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.openxmlformats.org/markup-compatibility/2006 In 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.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/2006/wordmlIn 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 2200576 bytes
SHA-256: fa173fb346204608f4cf04c0ce933fe6614007b763dcc89ff83fce19f571ab52
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2180872 bytes
SHA-256: dbf34cb1208cacfa86a2902477058bfe450e27d65d9ef378c3b250482df74c15
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5440 bytes
SHA-256: 25fdbee43c2d5b3fa60de92d178a185fb41352ababb00b49061046362a088c5c

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