Office (OOXML) / .XLSX malware analysis — malicious · 1e06476203502d33

MALICIOUS

Office (OOXML) / .XLSX

1.08 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 9e67043d3c0fd1e498d6ee89025962b5 SHA-1: 821407ca02c2062fa5b4c09266ec685c405e1b39 SHA-256: 1e06476203502d3373740d2f0f8ffdc8977fdc35a531ea7c00b67ca43bfb54de

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalous native stream data consistent with CVE-2018-0798, suggesting it's designed to exploit this vulnerability for initial execution. The embedded object likely contains a second-stage payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/58cuf.y9J1 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` `e732c5e03bcbec6268a71c84202d967ca1a62c500bf34bb1a3b75349c53e34b0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/58cuf.y9J1	1445888 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.40, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `81dd49a81b076acbdfc114167d7af7d65cef7df684d9348dfb849760e8e88cee`	ole-package	OOXML xl/embeddings/58cuf.y9J1 Ole10Native stream: oLE10NatIve	1431651 bytes

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