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

Static analysis result for SHA-256 9413de2415440571…

MALICIOUS

Office (OOXML) / .XLSX

17.8 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: cae741484215dc08ea209b09d047638b SHA-1: 9b68d9e700544dbee5882a54b0b0eaa5360820f7 SHA-256: 9413de24154405715817e85ae1ba7a4cd58373f9f1cd160f5b6a53f2941199a1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The sample is an Office Open XML (XLSX) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly within the Equation Editor's native stream, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for arbitrary code execution when the embedded object is processed, likely leading to the download and execution of a second-stage payload.

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
2441dd6b6f593bb813e0c29bef45993878c7dcee8a725f73e30bc1093aec6c41		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
8cd241123efe4e8b5fc377e8e558a0bb48f3329552c9f27ce729369467552c7a		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NaTIve 1638 bytes

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