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

Static analysis result for SHA-256 b55ddd1ef455b020…

MALICIOUS

Office (OOXML) / .XLSX

729.7 KB Created: 2020-06-30 06:04:05 UTC Authoring application: Microsoft Excel 15.0300
MD5: dc81ef2d65ba68ecee62b732568a0a80 SHA-1: 167d8b6f24db398f7a2fda2244c64827746de401 SHA-256: b55ddd1ef455b020d761e91d128598f1e441184db8f6a454c0889ea0fdaa0fe6
60 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object identified as an Equation Editor. This is a high-severity finding and a common technique for exploiting vulnerabilities in Microsoft Office to execute arbitrary code. The embedded object is likely a secondary payload designed to be launched when the OLE object is activated.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/JSk.p3s contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
94caac3e0606b3b009a77d9ddd52ff2f44a77012937af6829cb0d1cefa96e586		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/JSk.p3s 903680 bytes
ooxml_oleobject_00_ole10native_00.bin
a45c376f77cbc30c65171952302fc1862544feeacdb9ace1a731cd9e94555781		 ole-package OOXML xl/embeddings/JSk.p3s Ole10Native stream: oLe10nAtIve 894372 bytes

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