Office (OOXML) / .XLSX malware analysis — malicious · 88a9d336e063ac17

MALICIOUS

Office (OOXML) / .XLSX

16.0 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000

MD5: 3a07674673b81663198ca5d3ba8bfcfd SHA-1: 9850454d887e3bdddcff49d35a14eb8bc4ba0886 SHA-256: 88a9d336e063ac174f3d68123ed37da8befe8520ed82e87eeb4d17c87ea7b523

102 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. This suggests the document is designed to leverage this vulnerability to execute malicious code, likely leading to the download and execution of a second-stage payload.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY

Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `86c78c138cf2fdd9abfe84cb58eb094263a02839a39b9f6e5c10a01b04f31d18`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	9728 bytes
`ooxml_oleobject_00_ole10native_00.bin` `1cc826026b3c6ea2c7ff2e0e4fe6106fdf5063636699d5e3fb9ffaa2cf13b582`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NatIve	6971 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.

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