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

Static analysis result for SHA-256 77c8665b53101dec…

MALICIOUS

Office (OOXML) / .XLSX

727.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-06
MD5: 56237b6ce79e530ec324379d9f9593f7 SHA-1: 4d14f19c8c41dcc1a8dd1be2deda3a6dd5d5cc31 SHA-256: 77c8665b53101dec4f7b2091b7dfbb0beb61be63ccbf89d9b6e297a9a2e2ee53
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 Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability within the Equation Editor. This is a common technique for delivering secondary payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/JMY3mfj.WdR 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
4bf6628cbc6b4de6421ff872f07ec77cc9ed24dcf7714cb1c92fe3113d42882b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/JMY3mfj.WdR 1010688 bytes
ooxml_oleobject_00_ole10native_00.bin
1fe9b33f65ae29582cf917dc54b0b6739d5054159296446d1f6fd613e02b8f6a		 ole-package OOXML xl/embeddings/JMY3mfj.WdR Ole10Native stream: ole10NaTiVe 1000020 bytes

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