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

Static analysis result for SHA-256 0f0da1a657473454…

MALICIOUS

Office (OOXML) / .XLSX

647.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-07
MD5: d5530c1b047ae9487d93d40cacb3bc55 SHA-1: a8275d49ebea7cd46000dcfd17934dd73d31199f SHA-256: 0f0da1a657473454436ea00600aa138c3c461bd1f649513ed4042b930a5215d8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link 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 difference, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The document body, formatted as an invoice, is likely a lure to trick the user into opening the malicious embedded object. No scripts were extracted from this sample.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1GAuzqHK.mNaah 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
a4af121950582ebf949bc5800d3152a1623ab27bc020f59a43b9eabb8dfed98d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1GAuzqHK.mNaah 920576 bytes
ooxml_oleobject_00_ole10native_00.bin
74a58ca7bbe3e7437a60eb13b3aebce8ffa03b5f03cf41b14e4d4379a9618763		 ole-package OOXML xl/embeddings/1GAuzqHK.mNaah Ole10Native stream: ole10nAtive 910418 bytes

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