Office (OOXML) / .XLSX malware analysis — malicious · b1651fa50c35be38

MALICIOUS

Office (OOXML) / .XLSX

1.63 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-12-02

MD5: 70bd2a0650639a1d34c456cee2974d28 SHA-1: 23aa9b95cf05e59d7024d5b193010c8909f447f7 SHA-256: b1651fa50c35be38ac2fe3972a7300ba7192fb13cbdf841efb08cde23f930043

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1559 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded object's stream is malformed and exhibits high entropy, consistent with a packed or encrypted second-stage payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/KA7p8HOP.45I6m 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` `eee75d06e50584c6f946ede9845cdf3622720e11707930df157e2f1b8fac4618`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/KA7p8HOP.45I6m	1912832 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `6816347184652d7c20b11388cc5928f46c02c49af7f19d4f35cf2d0bacddafdd`	ole-package	OOXML xl/embeddings/KA7p8HOP.45I6m Ole10Native stream: oLE10nATive	1895143 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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