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

Static analysis result for SHA-256 a800aad2ac013544…

MALICIOUS

Office (OOXML) / .XLSX

18.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 087573d6967b9471437bd5e1b5ecd83c SHA-1: 0e17e0b80ff643bf79df0179c3d82b9f2def061c SHA-256: a800aad2ac0135443c998640e6438185959f8c8d6b0bec3f76951516526c7937
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (XLSX) file containing an embedded OLE object. High-severity heuristics indicate this OLE object is an Equation Editor object and specifically triggers the CVE-2018-0798 vulnerability due to an anomalous native stream. This suggests the file is designed to exploit this vulnerability for initial execution, likely delivered via spearphishing.

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.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
2b1d1ef525a818dfde0a9c8c5c7a8d15dd08c613248be4443115b93d9172b993		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
b13471e841b1ae6261cf25282920d4adc7c4ad708a524ab191838ab1f54c4e90		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10nATIVe 1754 bytes

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