Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 334c58f51bfa43ce…

MALICIOUS

Office (OOXML)

273.6 KB Created: 2021-10-27 09:39:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-11-02
MD5: 6815fb08fddc78d9ebcb4a27b530afd9 SHA-1: 9d39c8f919d08aeb7f26ee2fd992fc09ded85b7a SHA-256: 334c58f51bfa43ce906a6cfb013b64f415345e6d0ffffbafbecc975c3f29e7cd
84 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. This object is identified as a risky file package that drops an auto-executable payload, specifically a JAR file. The presence of this embedded object strongly suggests an attempt to execute a secondary payload upon opening the document.

Heuristics 4

  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/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 279040 bytes
SHA-256: d145b8d4411ba988c5f681c5b1d9f4846e2c7e8a74c2761553b5212642db1485
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.96, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 273695 bytes
SHA-256: b95c51092e449b4e2f66b9ddbf42f5cc32582104d835027a86438720333eac6b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5140 bytes
SHA-256: 1fee3838561f9a03183b4390d2e6ec55143fa89ad7973ec281715222c65b1382

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