Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 dcc30449330970d4…

MALICIOUS

Office (OOXML)

199.5 KB Created: 2021-02-19 18:39:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-03-01
MD5: a159d868540fea76d7d26fe763a1bbc2 SHA-1: f1a933085c631ed5a5235e01ea07d14d725b0e7a SHA-256: dcc30449330970d47fbf338261687abb151ad896356cd5f2db19a4a83d652bc1
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 191488 bytes
SHA-256: b5fa71d8c9c3ce6e27e27555ae7634b1eb5802207981ff188e00688fbfef38a4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 187528 bytes
SHA-256: e450b9a8b0b5ff5ccb4e69eecdb7b48cf9bf0b6a5d18fa581ef6c92834f89ccd
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_16432654891259913274828566674342256753185595684742711736449475983729258216511712.jar ole-package-payload OOXML word/embeddings/oleObject1.bin Ole10Native payload: display_name=16432654891259913274828566674342256753185595684742711736449475983729258216511712.jar; full_path=C:\Users\TESTER\AppData\Local\Temp\16432654891259913274828566674342256753185595684742711736449475983729258216511712.jar; temp_path=; def_file= 186562 bytes
SHA-256: 9ec5b22fb42b45805cce3151e1e6dcdad35571dc6afcee4011217c047a8bb1e7
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5148 bytes
SHA-256: af022887412219920f102bf9acd72133b4f1f3d5a7ccd9aeaf506ad5325b727d

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