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

Static analysis result for SHA-256 14542f0e7bd52ee5…

MALICIOUS

Office (OOXML) / .XLSX

2.26 MB Created: 2025-09-22 22:56:50 UTC Authoring application: Microsoft Excel 12.0000
MD5: 6434c9bbf093fdadf8ab69d2f1ea72f3 SHA-1: 54c02625b9b9f05d8c3dde88f5da36245295ab86 SHA-256: 14542f0e7bd52ee5330ea2f990a75e85f8d476a22c8eff76a6a5ed259a833348
120 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's likely a dropper. The document also contains a lure to enable macros or editing, a common tactic for malware delivery.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/PTlLSwl.fWZbFQE 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
86092950c0bfd402f4c49b2289aacca634a1f1db25dc2a76e988778a417d1913		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/PTlLSwl.fWZbFQE 2994688 bytes
ooxml_oleobject_00_ole10native_00.bin
26cb822bf9b2fef128ff745c2af1dd960540bb0fa3df1a4042a2f0b9da1d0590		 ole-package OOXML xl/embeddings/PTlLSwl.fWZbFQE Ole10Native stream: oLE10nATIVe 2968914 bytes

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