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

Static analysis result for SHA-256 fcb7b2cd2504dde3…

MALICIOUS

Office (OOXML) / .XLSX

716.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-23
MD5: b7957e8fb13de0cb009704a8ace9e526 SHA-1: 446299904f52e47882d3112cb86959277941102c SHA-256: fcb7b2cd2504dde3f3f64f50490e328cbf3f726424c3dbc63bc10f2ed0bf9e11
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significant size discrepancy, 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/nHu4.qp 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
fa10f8f84c1d208b523c8794f2bd94fa30fcf7749109c22746fa083937587aea		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/nHu4.qp 1055232 bytes
ooxml_oleobject_00_ole10native_00.bin
8aa81d0cbb798598a62452b141d8f5b39e7753b9f11cbac80aaebba4acc2ef92		 ole-package OOXML xl/embeddings/nHu4.qp Ole10Native stream: olE10NatiVE 1044027 bytes

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