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

Static analysis result for SHA-256 a5706754e01d62ed…

MALICIOUS

Office (OOXML) / .XLSX

658.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-05
MD5: eb0c982280356945b5351bfe26c01d6d SHA-1: e71636bec739feeea7de2b773077fd3e00c06c6c SHA-256: a5706754e01d62ed58ca67cd41fd39f6a4b791bda9bf4baa61b8f09caa1e888b
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 Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's being used to exploit a vulnerability. The embedded object's stream size and entropy are anomalous, further supporting the malicious intent. The document body appears to be an invoice or product order, likely serving as a lure to trick the user into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/11l.UEQ 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
e5f3e56fa6290cbbef83f96fd2091fcd1417b9274c097190824c97240c92df51		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/11l.UEQ 899072 bytes
ooxml_oleobject_00_ole10native_00.bin
5c3f3b7bffea2e2923d96f19a73fe30adee4117f7c85c78573fa15715d01e785		 ole-package OOXML xl/embeddings/11l.UEQ Ole10Native stream: OLE10NAtIVE 889413 bytes

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