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

Static analysis result for SHA-256 0967ae832c06d273…

MALICIOUS

Office (OOXML) / .XLSX

673.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-10-05
MD5: ed1844f29d49d91c746231daec6fd461 SHA-1: da07a12e12452321d49f90da71774f9b54b11ebd SHA-256: 0967ae832c06d273188411169976c460cfe19696b182cbc5cf5ac33e0ddded12
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 an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, suggesting it's not standard Equation Editor content. This strongly points to an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882) or deliver a secondary payload via the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8qUPSd.o0y 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
7fe923d32535843054f2b0a6d95e1964a9c7ac50925549b5e6e34af23d83e083		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8qUPSd.o0y 952832 bytes
ooxml_oleobject_00_ole10native_00.bin
e592889ad843131483f86244999a69ce8993f30dde2484a87719a6d90e802ffa		 ole-package OOXML xl/embeddings/8qUPSd.o0y Ole10Native stream: ole10naTIVE 942689 bytes

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