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

Static analysis result for SHA-256 067dbba9bee89bc3…

MALICIOUS

Office (OOXML) / .XLSX

637.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-18
MD5: c1e72fb13c1bce227aeb615d44bc8295 SHA-1: 34b444f9d4ff04491e7516db17132227dd045409 SHA-256: 067dbba9bee89bc3dc5b4e8b98cd2fa804c9a0d11e32e810b6ffedf282b9ab80
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet 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 with an anomalous header and a significantly larger declared size than the actual stream size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This is a common technique for delivering secondary payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VZMm3.Mo8KiL 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
544c099f486223f0d5a8cf192758d75e6cbd392561264e0a115ce93e8580f597		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VZMm3.Mo8KiL 896000 bytes
ooxml_oleobject_00_ole10native_00.bin
bc3c98d6010200179340c138d01802d5222e104131a0b8c4629e5061185a30e7		 ole-package OOXML xl/embeddings/VZMm3.Mo8KiL Ole10Native stream: oLE10NATIVe 886486 bytes

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