Office (OOXML) / .XLSX malware analysis — malicious · f6356c5334bb4c96

MALICIOUS

Office (OOXML) / .XLSX

2.67 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-09-28

MD5: 6bf8f67b71837360fa764886b55f2ca0 SHA-1: 432e670f3e8ed4e6e5fe25ac282b31c2e9b3763e SHA-256: f6356c5334bb4c962bf47d203ddd6c222a17eee5dda3a9d466273f57c9883a5c

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Office Open XML spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and carries a payload-like stream, suggesting it exploits CVE-2018-0798. The document body's prompt to 'CLICK ENABLE CONTACT TO VIEW FILE' further supports a social engineering lure to execute the embedded malicious content.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/KcdsVy9.BV7YZ0 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` `97a00112f082d8127d6a0cbfbc2d8c1682df4830c5fa0c3b67c7553e67585c5d`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/KcdsVy9.BV7YZ0	3055616 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` `d88f5393a134ad821f23b105674b952c9c68cadea93ddda50ccc1d09c4b83aa9`	ole-package	OOXML xl/embeddings/KcdsVy9.BV7YZ0 Ole10Native stream: Ole10natIve	3029209 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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