Office (OOXML) / .XLSX malware analysis — malicious · 07f73ff04ab80e45

MALICIOUS

Office (OOXML) / .XLSX

1.10 MB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300

MD5: f2af2d11edfac75d0d326ceaee8e3c2e SHA-1: b18827e7784ee6a86beecea0cf0eb3c147ba6c11 SHA-256: 07f73ff04ab80e4556fa01e1e93c345d768988b0d4cd344dafb605273bc651fc

102 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 an Equation Editor. Heuristics indicate that this object carries a payload-like stream with an anomalous header and high entropy, strongly suggesting it is a malicious exploit. The embedded artifact is likely designed to execute arbitrary code on the victim's machine.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/k7.n7oOX 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` `3d378227c8186894a28b02af680af9b84485ca1c79784cec03778770de329106`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/k7.n7oOX	1438208 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.62, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `8fa488ea33adad5b1c4b74ff4549e9f8f06ceaabd566c71cec520067eb118a0e`	ole-package	OOXML xl/embeddings/k7.n7oOX Ole10Native stream: OLe10nATIvE	1424479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.62, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.