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

Static analysis result for SHA-256 6eb0c244dd286ae1…

MALICIOUS

Office (OOXML) / .XLSX

10.9 KB Created: 2019-01-14 17:17:08 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2942174e9fc06907d3562f01566819c6 SHA-1: c80829dbb5aa1e805c864b1c191b0233d9d7a7e1 SHA-256: 6eb0c244dd286ae14af2f201e66ff971d8ad21135e2d619751e3755d606eb748
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an Office Open XML spreadsheet containing an embedded OLE object identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. The document body contains tabular data, suggesting a lure, but the primary malicious activity is driven by the embedded exploit. No scripts were extracted, and no direct IOCs like URLs or hashes were found within the file's static 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.
  • 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
8ea37f822bc2b01c8fed01c84de8a98894cb9704529db25032aba01c48969908		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
98a193110cf9d4e26ee2aa9bd64e6549d64a28179f74d1743518c35a38e2e218		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NAtivE 1710 bytes

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