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

Static analysis result for SHA-256 be4d4d70c6630d35…

MALICIOUS

Office (OOXML) / .XLSX

1017.1 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-04-21
MD5: 430f8aca37c67323cd56e4b3b246fe01 SHA-1: c23b12a62b23546a090fb0b1688d1ce83d6516fa SHA-256: be4d4d70c6630d3514d3558047f0032200cf20d1f5b89fa2142c3e1572d9de6f
100 Risk Score

Malware Insights

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

The sample is an Office 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 header and a significantly larger declared inner size than the actual stream size. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code. No VBA macros or scripts were extracted, and the document body was not available for analysis.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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
52c15f92f6993e8b8cd7333b170104124cde090a2d2c18e95e92812080276526		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 877568 bytes
ooxml_oleobject_00_ole10native_00.bin
ceda438d82b3058842f9348b3652dbcb41133738eecd3646fe9ee20c075ccd2c		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NaTivE 868167 bytes

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