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

Static analysis result for SHA-256 2d7c22989be36de8…

MALICIOUS

Office (OOXML) / .XLSX

609.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-10
MD5: d2f376d6acd3400985ad09fe1dcb5c68 SHA-1: e3a0bb86749644f7ffa2618c7eb93d6f28de9647 SHA-256: 2d7c22989be36de889866ad0fe58bc5993687d6d6b372dcc1b9f91343ec254e9
100 Risk Score

Malware Insights

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

The file is an Excel document 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 it is being used to exploit a vulnerability. This is a common technique for delivering secondary payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Dn9.WIbRb 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
55bb71db896cda8c1ec5922d33820361230829eb58ce42360bec57101182be8d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Dn9.WIbRb 879104 bytes
ooxml_oleobject_00_ole10native_00.bin
27baff4e3377bbe497f1b1c3a1d72c64a2895ff5a5259f4bc2411cb15af3abca		 ole-package OOXML xl/embeddings/Dn9.WIbRb Ole10Native stream: OLe10NAtiVe 869586 bytes

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