Office (OOXML) malware analysis — malicious · a02eafbc3888e6bd

MALICIOUS

Office (OOXML)

513.3 KB Created: 2019-06-25 10:28:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2020-07-02

MD5: ebb6aa5dad0d0011c00952c84cb490cb SHA-1: d2506ebe5cccefe18d88f9331117a94c07ff7411 SHA-256: a02eafbc3888e6bdb70f7cd6850ebe6b7042c39108782c2f42a5a9d4097700e5

84 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1137.001 Office Application Build

The sample is a malicious OOXML document containing an embedded OLE object. This object is identified as a package that drops an auto-executable payload, specifically a JAR file. The presence of this embedded object strongly suggests an attempt to deliver a secondary malicious 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.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.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin`	ooxml-ole-object	OOXML embedded OLE part: word/embeddings/oleObject1.bin	735744 bytes
SHA-256: `c3580793dc2a1ad9b97a31f78a67f4ce99e24e62949f914951f67b038b624c24`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.59, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	727397 bytes
SHA-256: `058037ea870e6dba14a71aaab183fd72e261bdd515d2ce7e809ea19c8ce484c2`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.63, consistent with packed or encrypted content.
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image1.emf	5476 bytes
SHA-256: `4c90517045b79f5141d7e7ddc42be46980a9521f1231aae967724e551b49b514`

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