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

Static analysis result for SHA-256 2018a78eea0e3d38…

MALICIOUS

Office (OOXML) / .XLSX

137.5 KB Created: 2020-07-07 21:52:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: a91ca12372d5c3209827484ec538de1b SHA-1: 9c8f178c5f4b236ff3a2d2a5ef32a40fe168f472 SHA-256: 2018a78eea0e3d38b14f5c700ec5a51e8d4328dd8c3d53f138daf5ee79b592d2
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically an Equation Editor object, which triggers high-severity heuristics related to CVE-2018-0798. This indicates the file is designed to exploit a vulnerability in the Equation Editor to achieve arbitrary code execution. No document body or scripts were extracted, but the presence of the vulnerable OLE object is sufficient evidence of malicious intent.

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
1efbd98f4d4c81824f39062d71d440fae61baa2b639d3b8a36a0ba74368adb33		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
169ba74b308264b369e9559b1ec37fc43f0bab2ca7f213378c5206bc014365af		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NatiVE 2357 bytes

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