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

Static analysis result for SHA-256 2139b1074b5d9dc9…

MALICIOUS

Office (OOXML) / .XLSX

702.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-02-25
MD5: ef4bda744334b23ef26595546a944591 SHA-1: 520edcdbb8ee43dc19512c37fdcb433b46b81ce2 SHA-256: 2139b1074b5d9dc9401121a62fca93c6b39208ccc47f5a9590fe05e776b89835
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet 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 size, strongly suggesting exploitation of a vulnerability within the Equation Editor. The document body content appears to be a purchase order, likely serving as a lure to entice the user to open and interact with the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/H8.YP 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
3ad0eceb4e4fbbd64d8aab76b78799c8051fea885e887691e6e706a0a48a60aa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/H8.YP 999936 bytes
ooxml_oleobject_00_ole10native_00.bin
2bdaed997ba1fcc775ee2811d827cff6d6ef3fdd90fb06069b9715329b212417		 ole-package OOXML xl/embeddings/H8.YP Ole10Native stream: ole10natIve 989333 bytes

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