Office (OOXML) / .XLSX malware analysis — malicious · 7396e26a6c1423a4

MALICIOUS

Office (OOXML) / .XLSX

1.91 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-05

MD5: 3765871afd5b7a4b6ada5322bd821d8f SHA-1: fb96c3d25f3565b9127609054900b00c1f2dffe9 SHA-256: 7396e26a6c1423a4c4b1ad08e3b971ae26eaf060e62bf4ce7ffcb595e7ae9a9d

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object is anomalous and carries a payload, strongly suggesting exploitation of a known vulnerability like CVE-2018-0798 for client execution. The embedded object's path within the OOXML structure is noted as a primary indicator.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/4APrw.m6Qgab 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` `eeef0fc4fbee98e6868421303d33cdcf9d82bd1750ec46c31c4099c9d12c02a0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/4APrw.m6Qgab	2273792 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` `3af2e1907a745f791ac559852b42ae9907a5fa4a3cdde347d15da6759e78bc19`	ole-package	OOXML xl/embeddings/4APrw.m6Qgab Ole10Native stream: OLE10NatiVE	2253420 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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