Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f8b72359281ef3e8…

MALICIOUS

Office (OOXML)

8.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 168bda59160447deaa9a47ed05429d7d SHA-1: b903f462eb0d18fc5d9ec416ec7386377453441a SHA-256: f8b72359281ef3e830c2f87210f563fff929d1de8fcb601cf965f4986df491fa
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a malicious Microsoft Excel document containing an embedded OLE object that exploits CVE-2018-0798. This vulnerability affects the Equation Editor component, allowing for arbitrary code execution when the embedded object is activated. The high entropy and anomalous native stream further indicate a malicious exploit.

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
3237707f02995dbd24603ec2c1cbdcd1a5352c94f7486e1fa48450dfb28ed283		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
2daf53bcd176738cb3b0172d58423b8939b0f368dd5b870d1b7de6ee42760ea7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10nATIve 2061 bytes

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