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

Static analysis result for SHA-256 f8ee24d3d503b8f4…

MALICIOUS

Office (OOXML) / .XLSX

661.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-15
MD5: e6f380ba0d38b2f5c63dd708b03fe7ea SHA-1: eab8cd75fd30c3f165a9b590dc99c1cd02f49b06 SHA-256: f8ee24d3d503b8f46747ff07f769b8be58ad51de60d4c62e2fbc551ee47a2c8e
100 Risk Score

Malware Insights

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

The sample is an Office 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, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/sxp2O2.9Q6Yv 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
6e58050560ea7053df0a56415f8e5ea2d0960d4b4792b5c774f813e6f6b8f6e4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/sxp2O2.9Q6Yv 976896 bytes
ooxml_oleobject_00_ole10native_00.bin
c1f8bded8d1c9a71b86f6b6f6fd0cf4613d6e7b089ba39e77f03c5cba72d2e04		 ole-package OOXML xl/embeddings/sxp2O2.9Q6Yv Ole10Native stream: OLE10NatIVe 966800 bytes

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