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

Static analysis result for SHA-256 1b20073ae526d568…

MALICIOUS

Office (OOXML) / .XLSX

690.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-04
MD5: 7cb3a6395da258ab05d382b44ec9f05d SHA-1: ce4be6ba9c0848f4808dd11b06dd278a91042e0e SHA-256: 1b20073ae526d5684b2d517cbc6e3156cce83a7aefa65c6503411ad3d411bae2
100 Risk Score

Malware Insights

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

The file contains a high-severity heuristic indicating an Equation Editor OLE object that carries a payload-like Ole10Native stream. This strongly suggests the exploitation of a vulnerability within the Equation Editor component to execute arbitrary code. The embedded OLE object and its anomalous Ole10Native stream are the primary indicators of this attack vector.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6GGuYZYk5.NxmHka 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
e1d89929e336014452934966050c1848face3fe50c3c0d7ed50484496f497c58		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6GGuYZYk5.NxmHka 995328 bytes
ooxml_oleobject_00_ole10native_00.bin
4a712c51c29fbba2f1707777c03b913325605558670de5f8f16e61cfe1bfde81		 ole-package OOXML xl/embeddings/6GGuYZYk5.NxmHka Ole10Native stream: OLe10nATIVE 984880 bytes

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