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

Static analysis result for SHA-256 efeed523859d8108…

MALICIOUS

Office (OOXML) / .XLSX

602.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-07-10
MD5: ad33007c693a7117e9a0dddefb3a0c9b SHA-1: 1e677908b8d47a920ea58a673bfd55a98df36b54 SHA-256: efeed523859d81083307c7ede48a25cae675055a529b33d8aa19935ec24c3f95
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object, which is known to be a vector for exploiting vulnerabilities. The high severity heuristic OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY indicates that this object carries a payload-like stream, suggesting it's designed to execute malicious code. The document body appears to be a business-related order or invoice, which could serve as a lure to trick users into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gLTwVece.xFEB 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
9c7c2abecbbf084c4f25ea25086d1a9aa5b38db4f2cf71d2ef4fd1d2060d38dd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gLTwVece.xFEB 833536 bytes
ooxml_oleobject_00_ole10native_00.bin
550105ff9d7a5ed7d90ea9faeac28bf596202cb551db5ac7054249b3e6c54ae3		 ole-package OOXML xl/embeddings/gLTwVece.xFEB Ole10Native stream: oLE10NATivE 824440 bytes

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