Office (OOXML) / .XLSX malware analysis — malicious · 831518fee7137eb6

MALICIOUS

Office (OOXML) / .XLSX

2.69 MB Created: 2022-07-26 22:32:06 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-08-05

MD5: d0cd467a481799f5dc06a498e24ff4ad SHA-1: da919b490b8192eab7c577b4a85337d09eb56a9e SHA-256: 831518fee7137eb607ad0fd8b629784dd692f981f6060465079945a13dba6c4c

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate this object carries a payload-like stream, exploiting CVE-2018-0798. This suggests the file is designed to deliver a second-stage payload when opened, likely through a spearphishing attachment.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/dbSYXB9S.Pu6cL 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` `02ea45ab816d1a7a04b5a026fb0303130a3ae47be3da47a9f67effb071015259`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/dbSYXB9S.Pu6cL	3034624 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` `07a1fc33a407e2501619398a477d2eae23a3c1739113171f566c0140c898116f`	ole-package	OOXML xl/embeddings/dbSYXB9S.Pu6cL Ole10Native stream: oLE10nATivE	3008016 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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