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

Static analysis result for SHA-256 d28098dc39c450b0…

MALICIOUS

Office (OOXML) / .XLSX

731.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-13
MD5: 55fc97c2b3776b8065b023af8e9817db SHA-1: 6c308ccafd35a26c73c77020625e26a2bddc7ca3 SHA-256: d28098dc39c450b028938621c56df17eea2e93693150d1ae5ec2eace3df3748e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded object is the primary indicator of malicious intent, likely serving to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/j1z.7h 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
5e759e2f62c6dc496b8e759b49d42c8bd1431adb0e83c74259028148726818e1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/j1z.7h 1031680 bytes
ooxml_oleobject_00_ole10native_00.bin
2e334242d5d7eb08f1263bc9718909bdbf1f157c4ccc62092604ce35aa94f062		 ole-package OOXML xl/embeddings/j1z.7h Ole10Native stream: OlE10nativE 1020933 bytes

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