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

Static analysis result for SHA-256 d498e75e39de09b5…

MALICIOUS

Office (OOXML) / .XLSX

620.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-14
MD5: 5c80759dec4c98ff03128d463bebe785 SHA-1: 3399ea1af9000f5dc888f8781242cf10135ff23d SHA-256: d498e75e39de09b5d0a2451ace58825db00797f40d71ed82438cd2f369788765
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Zjs59kknD.d8V contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
b247e64c70d322b558c5dc4566788a4b9a3a3a522539b8f350b480491710195a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Zjs59kknD.d8V 892928 bytes
ooxml_oleobject_00_ole10native_00.bin
313a10a20f6bb579c8add2a39721003544162c29dcb569a98e0c7dab15e0ff64		 ole-package OOXML xl/embeddings/Zjs59kknD.d8V Ole10Native stream: oLE10naTIve 883638 bytes

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