Office (OOXML) malware analysis — malicious · 432ba570a10b9463

MALICIOUS

Office (OOXML)

180.1 KB Created: 2019-05-27 22:54:04 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-07-24

MD5: 37d2b2ea3bfb1d6c125adfa6813ea088 SHA-1: 4bbd0dbcb1d9d57c4ca9d2fe7b488ef469271e52 SHA-256: 432ba570a10b9463817d07f75e0ab5d353f81ed8534b24e4e6eb6d806c7c052f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate that this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. The embedded object's native stream is suspicious and suggests arbitrary code execution capabilities.

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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	180224 bytes
SHA-256: `b85521e9e2c1b2135b626bc1ecb2bae4f58599c9bea76d3381e67831645fa003`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10nAtiVe	176367 bytes
SHA-256: `1c13bcd1e9aef64df4f5bf23e2737ef7e53c3008b40bcd3f73a0401ae68bd196`
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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