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

Static analysis result for SHA-256 3e0e1eab1df209e5…

MALICIOUS

Office (OOXML) / .XLSX

642.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-02-22
MD5: d2b441933cd09642f14f3bc81608f6aa SHA-1: b839968c97bc62b6291942ad2fc90aa94a18ac5b SHA-256: 3e0e1eab1df209e517c5b747312f7a4ec2d3a107bc140b500cf361429c1729b1
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 an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it is being used to exploit a vulnerability. The embedded OLE object's path within the OOXML structure is also identified as a potential IOC.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zGjbe8m.0Sx0k 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
53f70f1f0deef0f45a19b4011ba9447f8aa110bd3c0e9cb114a2e31f4c474407		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zGjbe8m.0Sx0k 881152 bytes
ooxml_oleobject_00_ole10native_00.bin
22995d2a1a3bff4ae50f46276c5828a10d6aeeb290ddc496e1c1a7c773be471a		 ole-package OOXML xl/embeddings/zGjbe8m.0Sx0k Ole10Native stream: ole10nATIvE 871795 bytes

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