Office (OOXML) / .XLSX malware analysis — malicious · 27935f169f2b4c3c

MALICIOUS

Office (OOXML) / .XLSX

1.29 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000

MD5: eda00c0d1d5ecaa65ff948f4adba1dde SHA-1: 92b96494e6d1fd6ac4e29d1a2d7790d41f172d4e SHA-256: 27935f169f2b4c3c036ef1c1ad86835d4cb784519a33f65a6b9dbd7ed8a0d91a

102 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object carries a payload-like Ole10Native stream with high entropy, suggesting it's designed to execute arbitrary code. This is a common technique for exploiting vulnerabilities like CVE-2017-11882 to achieve initial execution.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/S91.wMgp contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
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` `cd86cf17dfb461c54d823ade4458869321117a5fac91652e8aee66d1a316c84e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/S91.wMgp	1602560 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` `fe506cb32b719dd9f10de9f555a1b4df4ab01598c427726d93441b6aeb7fc27a`	ole-package	OOXML xl/embeddings/S91.wMgp Ole10Native stream: Ole10Native	1587207 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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