Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 75db6bec966ae82e…

MALICIOUS

Office (OOXML) / .XLSX

2.12 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000
MD5: e2f2aadc271efbe32c03451ce02ce7af SHA-1: 8783f198b48fe93c27afae734f42c39ca8c5d588 SHA-256: 75db6bec966ae82e20d35e29ccb9ddf7b3ef1e9252d3d989cdd4b40bd69c42fb
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting it's being used to exploit a vulnerability for client execution. This is a common technique for delivering secondary payloads, often via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rFecJ.ZMuq2Q 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
bd1516d94333c312bcb68028fee36572b6f84b96229f7e66c1244b2c5c98a9b8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rFecJ.ZMuq2Q 3037184 bytes
ooxml_oleobject_00_ole10native_00.bin
e7e336c5a6b7f7cd313f792f4b250a8ac481b137947323aebb5cac907d712c3d		 ole-package OOXML xl/embeddings/rFecJ.ZMuq2Q Ole10Native stream: olE10naTivE 3010854 bytes

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