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

Static analysis result for SHA-256 ec623e6a4110c4ae…

MALICIOUS

Office (OOXML) / .XLSX

605.7 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-08
MD5: d3d7bb9fa7c34c243f75c235bcf91cf6 SHA-1: 2ae2a644349fa07fcfe41cfb9b02e088016e051a SHA-256: ec623e6a4110c4aef554c1e230a977700a2a5042ef57b429229033ec135280db
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size. This strongly suggests the exploitation of a vulnerability within the Equation Editor to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zHwSrXl.nOWYalQ 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
0b030da11ef575b912abdb34393ff76e3783e6386f89dc68dead468194e08b40		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zHwSrXl.nOWYalQ 824320 bytes
ooxml_oleobject_00_ole10native_00.bin
9b550c8346be685bdd94eb1db7859dca6b47e8f34ee900666d8b5d84aaa9a3fb		 ole-package OOXML xl/embeddings/zHwSrXl.nOWYalQ Ole10Native stream: OlE10NaTive 815469 bytes

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