Office (OOXML) / .XLSX malware analysis — malicious · dc82ef52c92f8bf0

MALICIOUS

Office (OOXML) / .XLSX

2.78 MB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-12

MD5: 253c794b4fbb1a984a529124f293a395 SHA-1: 6634fea1966118eec51ed017705b9239bf618ea1 SHA-256: dc82ef52c92f8bf03ed5e3f14ae24b0e3fa06696ac1996ec7f2e33faed119831

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798, a known vulnerability in Equation Editor, suggesting the embedded object is designed to execute a malicious payload. The high entropy and anomalous structure of the embedded stream further support this conclusion.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/jvXbQp7C.iV 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` `060bc837b4d18f5431f56271cbc1742dd2bcd7024808489338fbe99fa274e197`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/jvXbQp7C.iV	3222528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `7945f2d6f3de415101f4efc4749f29597bfaf6e430607743713e421436e6e8fe`	ole-package	OOXML xl/embeddings/jvXbQp7C.iV Ole10Native stream: OLe10nAtIVe	3194831 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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