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

Static analysis result for SHA-256 68a8275aa4ccac36…

MALICIOUS

Office (OOXML) / .XLSX

2.21 MB Created: 2025-09-04 00:14:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: d764be41291e5197af2f256c860b6394 SHA-1: c3773e88efcb488c2260968104435b492bfd4dc8 SHA-256: 68a8275aa4ccac36daaef13527c2713ad7c5e185f3973c6f4327e6b48652078c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment 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 an anomalous header and size discrepancy, strongly suggesting it's designed to exploit a vulnerability. The document also contains a lure to enable macros, further supporting its malicious intent as a dropper.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/cvza.gf 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
b5ad0c056d7d40da1ca3e15dac89dc91531d85b7a0ac3f0688091b22f8eb6a8d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/cvza.gf 3042816 bytes
ooxml_oleobject_00_ole10native_00.bin
f47d3768aca31596840c67ae33f0430bd9c5e02692cd48309c1c1256af91ec29		 ole-package OOXML xl/embeddings/cvza.gf Ole10Native stream: olE10nATiVE 3016193 bytes

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