Office (OOXML) / .XLSX malware analysis — malicious · 07e52c80192cec0e

MALICIOUS

Office (OOXML) / .XLSX

1.25 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000

MD5: 9781d72e85449c801fdab473f3db7073 SHA-1: 8c41aabd65323a45d80300ff82f41be933ded3be SHA-256: 07e52c80192cec0ef41ce46b3b13c3bba758a0d7c5431d6f72b1983a5b92c2fc

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 a Microsoft Equation Editor object. Heuristics indicate this object carries a payload-like stream with high entropy, strongly suggesting it's used to exploit a vulnerability for client execution. The embedded artifact names are included as IOCs.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/FMLcT.K4E 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` `5d30c9ec788cb7bac99f5db81f5736a6107842a7b02f5dd880aa994cdb42f1a0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/FMLcT.K4E	1608192 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` `47f670a30de3988f51ecafd363bc5a04bc306c47b46bdc2e5dc0982a8c3e4414`	ole-package	OOXML xl/embeddings/FMLcT.K4E Ole10Native stream: OLE10NaTiVE	1592931 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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