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

Static analysis result for SHA-256 a6107780fb8d4692…

MALICIOUS

Office (OOXML) / .XLSX

642.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-20
MD5: 7040be6b861fd995849a474396a5e527 SHA-1: b572f46abe7dc0fdfc5974bf1b0c97f6402a3caa SHA-256: a6107780fb8d46927db6aa241d771899017301c708a2e06ad0f60d9fee78a08f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common technique for delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/FhzgY0.tdr4 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
9dac91a072c7d53ac47de6ea29fa010b900a7d3e456c642d45326d6bee952dca		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FhzgY0.tdr4 945152 bytes
ooxml_oleobject_00_ole10native_00.bin
06b0c13a4db8b8df3d7a99ea6824f4ae4b9b81a2a6723e2b73efb0bd7db49bbe		 ole-package OOXML xl/embeddings/FhzgY0.tdr4 Ole10Native stream: OLE10NATive 934934 bytes

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