Office (OOXML) / .XLSX malware analysis — malicious · 65834111f1ad187c

MALICIOUS

Office (OOXML) / .XLSX

2.20 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2022-02-16

MD5: 6b51aac41f71ff7bba912670ec7daea4 SHA-1: 27921e253f63fef923f1d50db854a6674502fda1 SHA-256: 65834111f1ad187cc72bfd7f2a506c929d709fa2ae9f239facf7fbb2b67a45c4

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting exploitation for client execution. The embedded object's native stream appears to carry a payload, though its exact nature requires further dynamic analysis.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/2b60.8bQ 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` `3eb2339f95009c605b0fe5274fb9390b2b706fd86496c1cf9c3dfca528e27dc7`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/2b60.8bQ	2589184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `8fde094e23285f9aa39d204f66224db6dd84da78054400f3a8893808aacf3b08`	ole-package	OOXML xl/embeddings/2b60.8bQ Ole10Native stream: Ole10natIVe	2566508 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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