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

Static analysis result for SHA-256 abd60e9d2964ed03…

MALICIOUS

Office (OOXML) / .XLSX

129.1 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: a2562fd92cb35e0d9c37fe69b1c3f671 SHA-1: 02eca145ee46b47c29d63ded1c1d885c7fcecfa5 SHA-256: abd60e9d2964ed03a23bac96bab13f47d7ac17393bf9e1d0fdf61d848e23ce9a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the file is designed to exploit this vulnerability for client-side code execution.

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
c83a67d638674462180821846080bc93338b85558e519a5a162fa3b7bd1d5156		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
b426ecd712c63bc2b73e663cfc739189a83fac1e38ce71060d32f428fc5d3efa		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10nAtiVe 1903 bytes

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