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

Static analysis result for SHA-256 461d9525f0878edd…

MALICIOUS

Office (OOXML) / .XLSX

709.7 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300
MD5: 0a97784caa887980fbcdeeefa6030fa9 SHA-1: 53b88297cde8ed9611b084fe365651400c134762 SHA-256: 461d9525f0878edd59340ef9ac133f74b184d44f5ab6db95ee3d83b1290914dd
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1559 Component Object Model Hijacking

The file is an Excel spreadsheet containing an embedded OLE object, specifically a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for the execution of arbitrary code, likely leading to the download and execution of a second-stage payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vDKRPVSM.TF5pleG 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.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
598e2d4b3cee2beee1bdce8949f522369f3af47d9db62b8063e73b761682275e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vDKRPVSM.TF5pleG 998912 bytes
ooxml_oleobject_00_ole10native_00.bin
cc402ebf231890d86771c2d1459579beb27628b55617799955a89af4b9f48bf7		 ole-package OOXML xl/embeddings/vDKRPVSM.TF5pleG Ole10Native stream: oLE10NatIve 988588 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.