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

Static analysis result for SHA-256 6989455d63738bda…

MALICIOUS

Office (OOXML) / .XLSX

615.0 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 92dbe8752681407e5a3a0f7e6d914408 SHA-1: 3d09b0e1d82aefb18e7f0519fd277da2550887e4 SHA-256: 6989455d63738bda1dd4a308a7d2293c3ed5684eb1584633f8ad621fba77fa07
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document 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, suggesting it is being used to exploit a vulnerability for client execution. The embedded object's declared inner size is significantly larger than the stream size, which is a common characteristic of exploits that use object padding.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/BLmvcoF.Ocf 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
62613daf7d3fab6710b4079f98d2154377f25a970539f4f576589e49b9f1c90f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/BLmvcoF.Ocf 925696 bytes
ooxml_oleobject_00_ole10native_00.bin
33c16985c2fa45ae883acbfcc36b6f5805c22eb7a0a3979bb0bc0344dfbae233		 ole-package OOXML xl/embeddings/BLmvcoF.Ocf Ole10Native stream: OlE10NaTIvE 915694 bytes

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