Office (OOXML) / .XLSX malware analysis — malicious · 6947d0db3adfbbdf

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: b51992193ff88b58d01985d9af954126 SHA-1: 171e054ab5f297d651d89f5c7df00a6b82febaaf SHA-256: 6947d0db3adfbbdf4718f9fd1526ec82e0a3812b56e412f9143556bb30d9a107

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object is anomalous and carries a payload, likely exploiting CVE-2018-0798. The embedded OLE object and its associated native stream are the primary indicators of malicious activity, suggesting the document's purpose is to execute arbitrary code via the Equation Editor vulnerability. No scripts were extracted, and the document body content appears to be unrelated to the malicious functionality.

Heuristics 5

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.
Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY

Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
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` `7d029ad153f72a36f8ac77b3b96e0aec5b3026a21f2b8d0b2d2f13a8ac685b29`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	847360 bytes
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.bin` `77a17bf898fc751baf919b871de9889c10285c1b46958559d2fcf9515a7d3e90`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NATive	838511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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