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

Static analysis result for SHA-256 37c6d438bc28ad22…

MALICIOUS

Office (OOXML) / .XLSX

669.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300
MD5: cee23ea75541cbbe12c149df6a71dfb7 SHA-1: 854b46606e78524c0f9e202b2f76dd02c94d4bc3 SHA-256: 37c6d438bc28ad226d5c1557d2154dcfd2ad7cac6936e8d5bf72f8b612c3f0f9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's designed to deliver malicious content. The document body presents a seemingly legitimate purchase order, acting as a lure to encourage user interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/KUA.jYSMfpY 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
1e47a56222ed4dd3f182d4576e23032f9aa8bfa98fa441fe3cf0280a59223eb4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/KUA.jYSMfpY 985088 bytes
ooxml_oleobject_00_ole10native_00.bin
ece5569f864efa5d90584a886738ef90515799f361bd23e5e3afe39d3da644cd		 ole-package OOXML xl/embeddings/KUA.jYSMfpY Ole10Native stream: OLE10naTivE 974372 bytes

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