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

Static analysis result for SHA-256 3e8da1770ce2ee5f…

MALICIOUS

Office (OOXML) / .XLSX

10.2 KB Created: 2021-05-11 00:05:39 UTC Authoring application: Microsoft Excel 14.0300
MD5: 2165a079abe83077f6063b3875afc6c7 SHA-1: b9a76804266fd885330b314836aaa8751ddad21b SHA-256: 3e8da1770ce2ee5ff2d7f41bef3299f07a56c21086e92a697b0ba4178a4a0c67
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an XLSX file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution. This suggests the file is designed to exploit this vulnerability upon opening.

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
d9cd4a8f5971c3c229a677631e9cb15803c1687cd733263bfcd6fa7a42f012a2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
2ba06c1a0cb5827f12cc5f17be8764211b43b0ae7ca6ec7311b7e2d7b362869b		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NativE 2098 bytes

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