Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 94308b451646ca73…

MALICIOUS

Office (OOXML)

21.9 KB Created: 2020-03-19 23:07:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-05-25
MD5: 731c8acb00614d9f0862a3907e6e03fa SHA-1: 79183461dc5fd2c22eb7270ef29e128b2f5377ff SHA-256: 94308b451646ca738917ab2e7229a930997e4d7cdf36958f6753d8bcd7983db3
140 Risk Score

Malware Insights

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

The sample is an Office Open XML file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which targets the Equation Editor. This suggests the file is designed to execute arbitrary code upon opening, likely delivered as a spearphishing attachment.

Heuristics 4

  • 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.
  • External relationship high OOXML_EXTERNAL_REL
    External target in xl/drawings/_rels/drawing1.xml.rels: file:///D:\images\spacer.gif
  • 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: c6226c3a9fd03b73b7f23467b8fc2c0f3510e78dac58fc030789fab919652299
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1672 bytes
SHA-256: b8c538b4bab698844b07d3f24cc4b361b4f4dac7e982e2b17fafa930f48e9804

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