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

Static analysis result for SHA-256 d7ac86d068661eef…

MALICIOUS

Office (OOXML) / .XLSX

756.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-28
MD5: ea0ba7ee7d611845784b4af6fc9ba004 SHA-1: 9fa13a80b4b0b3275332429664a7c012db9af60d SHA-256: d7ac86d068661eeff64b952178879c7cdb7426fa93f769f75d237d071990b055
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared size than the actual stream size. This strongly suggests an attempt to exploit vulnerabilities associated with the Equation Editor to deliver a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/bYRF.F71lNS 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
7c7f48c065c854ed8e1d9e4adcda2f24eb4e09dd6e21e09ed1fc867353ee3e37		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/bYRF.F71lNS 1019904 bytes
ooxml_oleobject_00_ole10native_00.bin
5a4b7fadd3832bed49ca99e2ed7a981c1d11d30943f47ba7a16af01aa9c28563		 ole-package OOXML xl/embeddings/bYRF.F71lNS Ole10Native stream: olE10NativE 1009397 bytes

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