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

Static analysis result for SHA-256 0476d4eb02fe459d…

MALICIOUS

Office (OOXML) / .XLSX

665.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-08
MD5: b052a00db4441975adb31dce8067fa05 SHA-1: a2e8a8e4c5fb7ec24dd2af72325a74f9c04cbe3e SHA-256: 0476d4eb02fe459d3672dc246834cdf78f78b914554e7f40190421a33188a27f
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 Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This is a common vector for delivering secondary malware payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8mk0u.tfvn 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
65eb50349f914a7abf10c7b538d230cdb8a6afb11488dfdb457414e98c997729		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8mk0u.tfvn 975872 bytes
ooxml_oleobject_00_ole10native_00.bin
a2afe022fcc60b8ab15c89eeaa6bfb52b1a4314c9c837c5c6a234f9a5545f608		 ole-package OOXML xl/embeddings/8mk0u.tfvn Ole10Native stream: olE10NATiVe 965914 bytes

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