Office (OOXML) / .XLSX malware analysis — malicious · 6ac9a3c7813e32b9

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 6c31225d56a5f4f4f2dde9fb7b3ce086 SHA-1: a17c41a94b3e525f4e39f27b68b8ce51f5e73e57 SHA-256: 6ac9a3c7813e32b9e716cf8bccbc08d95c9e929df3984b0ea9f019897df24fa6

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate this object carries a payload-like stream and exhibits anomalies consistent with CVE-2018-0798, suggesting it's designed to exploit this vulnerability for client execution.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/sDEHIV.AgVnp 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` `1438378fd2a0c6005bb81c7c7dd858a8e73f458cb18c0af04eb66c5a81bc4fda`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/sDEHIV.AgVnp	1409024 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `37639c1d567c5ba6f0b3928e19195d8a7b8218c86a4c20cecd62c2033e6a6d22`	ole-package	OOXML xl/embeddings/sDEHIV.AgVnp Ole10Native stream: olE10NAtIVE	1395269 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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