Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 59fe44dc96f2cf24…

MALICIOUS

Office (OOXML)

14.1 KB Created: 2017-06-03 22:35:23 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-04
MD5: d32213cc6d62528744d4e6366bd1cce1 SHA-1: 51925ddd43aff25827db5ca395d318d9294fced5 SHA-256: 59fe44dc96f2cf24441a53e339e54f9f2b2251b352527ee565c9d0e2c63f1a23
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a vulnerability, CVE-2018-0798, is likely being exploited through this object. This exploit allows for arbitrary code execution, making the document a delivery mechanism for a malicious 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: 3cd9ee315203bae5824a6d353f8aa417ac2a1a7981feb64be82cea59a2ac2e44
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1838 bytes
SHA-256: 2cd453c182c44100b05bba4b998e5a3650c8dbab7a6ce43712d18ea3d51a5367

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