Office (OOXML) / .XLSX malware analysis — malicious · 3d0973ce02b4d4f3

MALICIOUS

Office (OOXML) / .XLSX

1.08 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-02-16

MD5: 898d93f26dd60e059011cfd3dd1f87a2 SHA-1: 005ac8719255bdb3be7600d1371e12a4378b2736 SHA-256: 3d0973ce02b4d4f388c694816e6f2d24d88713d6c5f40245633d91a578e50c8c

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: Exploitation for Public-Facing Application

The file is an Excel spreadsheet containing an embedded OLE object, specifically a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. The embedded artifact, ooxml_oleobject_00_ole10native_00.bin, has characteristics of a second-stage payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/XN.WPJ6bEx 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` `eefa9e604f9c4f95945ec828c13071ce047cb7e8d6078cfd32b9f07dc8097e08`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/XN.WPJ6bEx	1390080 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.85, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `0f35e3ff70a61370ad47505807f2cca73537f2982acec4f02fb9ac52de032a51`	ole-package	OOXML xl/embeddings/XN.WPJ6bEx Ole10Native stream: oLE10NAtIVE	1376266 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.84, consistent with packed or encrypted content.

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