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

Static analysis result for SHA-256 b8d71d7331effe9c…

MALICIOUS

Office (OOXML) / .XLSX

14.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 7690cef1de4e459e7420c8a8def60b47 SHA-1: 197952aea3266b278f1f1d81bdc830a43e6078d3 SHA-256: b8d71d7331effe9cc867e81cc0c442cc3a49ceb3945b1994a8dcb49379c89932
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, suggesting exploitation of this vulnerability. The document body contains what appears to be logistics or shipping data, likely a lure to disguise the malicious intent. No scripts were extracted, but the OLE object's structure strongly implies it's designed to execute arbitrary code.

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
75ff9600978edcc4429d02c906c58d3683e2d28f40140b1c85773b794052abcc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
453c8516e645cad1bda7a8b8d51938a1eefc336bcef853d41fad38e4b85b0c34		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10nAtive 2158 bytes

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