Office (OOXML) / .XLSX malware analysis — malicious · 0ec0f53190782e1c

MALICIOUS

Office (OOXML) / .XLSX

1.41 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-28

MD5: 8862b0b8cf6f94732df9ebfe73b0b74e SHA-1: 43b194f0408ec0f4904817044d221ace00553054 SHA-256: 0ec0f53190782e1c4b92039ba199e2fd71ce3a620c628ffa569a06a53fa3cd4f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 via an anomalous Equation Editor native stream, which carries a high-entropy payload. This suggests the file is designed to execute arbitrary code through the Equation Editor vulnerability.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/5G8.mYSy0Vq 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` `b8aa4a403fbfc594cd23ace62dbe621451bd691eed284a3cb9f38843a8db9fae`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/5G8.mYSy0Vq	1726976 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` `728cd3510b6d8a244f670d2c64caae95d8e70837b2fc31df442e4898a6f87b53`	ole-package	OOXML xl/embeddings/5G8.mYSy0Vq Ole10Native stream: Ole10Native	1711074 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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