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

Static analysis result for SHA-256 5a2210aa7737a4ce…

MALICIOUS

Office (OOXML) / .XLSX

19.3 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 0f74444aa60e7ca295b36c2f75cd50ef SHA-1: f294d673bb11a96428a537d9755f07c5dccb7f1b SHA-256: 5a2210aa7737a4ceff85e8587927af1145133e3f04a8c2bd287ca487e7aa3fcd
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly within the Equation Editor's native stream, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for arbitrary code execution when the embedded object is activated.

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
97116e0feb063d07f1aa4e5d160f9dff25d75633873a7e360e1fd96b2a8cba6c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
85427c87bf49e9a568211ed8f3d1f34b8bcd445faee351dac342970ce47b65e2		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NatIvE 1780 bytes

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