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

Static analysis result for SHA-256 dca28fc1be6424d5…

MALICIOUS

Office (OOXML) / .XLSX

620.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-18
MD5: eb88893f73ee849e3b5d3652f03e3d77 SHA-1: c5508f5ea2ea317d300d9d217937de549e3e3eee SHA-256: dca28fc1be6424d51a5ff7f69d50c19b75631c5fabfcbfad25f8f69ee395cb01
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significant size difference between declared and actual stream size. This strongly suggests the exploitation of a vulnerability within the Equation Editor to execute arbitrary code or deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/w3bi.2GA 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
58f7f74ebb2009add69e70a584a7c66a465d719efbc63977a94a6216866bb286		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/w3bi.2GA 835584 bytes
ooxml_oleobject_00_ole10native_00.bin
2d4e0e816bb8914ae281a4517e70295da7104d2b50806fd46cd5d6fbef48b2bf		 ole-package OOXML xl/embeddings/w3bi.2GA Ole10Native stream: oLe10NATiVE 826813 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.