Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3df7882891afff23…

MALICIOUS

Office (OOXML)

240.3 KB Created: 2020-10-30 21:16:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2020-11-05
MD5: 10d4bc74179e16e90e71a21e1d779a77 SHA-1: 8f11f0c100dbf827c6ed64af4c5dc2eea7bc9de1 SHA-256: 3df7882891afff234ff7c5fb2f7402047b369f8953aaffa9e4293eb76cfc1c3e
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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 231424 bytes
SHA-256: e20ebe2aca5946d4a81063e7579118cdf52902362788359f5c28ab55dfdc8f71
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 226986 bytes
SHA-256: 492f0a47a45731f594044b12eb34672fbab6b61ace4e9cc56717d18172039d00
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00_13413446923459551368621112915311566242352299468484.jar ole-package-payload OOXML word/embeddings/oleObject1.bin Ole10Native payload: display_name=13413446923459551368621112915311566242352299468484.jar; full_path=C:\Users\TESTER\AppData\Local\Temp\13413446923459551368621112915311566242352299468484.jar; temp_path=; def_file= 226290 bytes
SHA-256: f5ed560fbb53192c72f8ac270867eeb1efc285508e63340b9af068c9c45ebf8f
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5132 bytes
SHA-256: 064f50f1ac8f0fc3b873cc02cf6736963dee1dd66c6a5d261498d0501728f34f

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