Office (OOXML) / .XLSX malware analysis — malicious · d52b8e527ad35f54

MALICIOUS

Office (OOXML) / .XLSX

1.52 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000

MD5: 9a809e0f1d435948eacdf1f0fb8b8316 SHA-1: aea62b0466c64967303de73085f16f40018cd44e SHA-256: d52b8e527ad35f54de8e65b0d7c324a9c1afddcd0d09e4d20ea0cb7c8b327394

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: Malicious Attachment T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file contains an embedded OLE object, specifically identified as a vulnerable Equation Editor component (CVE-2018-0798). This component carries a payload-like Ole10Native stream with high entropy, indicating it's designed to execute malicious code. The exploit likely targets the Equation Editor vulnerability to achieve arbitrary code execution.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Hsdet.sR3j 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` `2a4dc5201238bfd646d0dbd15da37b78f3fa438df67f330f89f98c7ee8f9d7ca`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Hsdet.sR3j	1848832 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` `65a6290dbd952a7cb80c89f029bfa855fdfbb9c9d23b29a017ba899514002375`	ole-package	OOXML xl/embeddings/Hsdet.sR3j Ole10Native stream: OLE10nATIvE	1831604 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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