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

Static analysis result for SHA-256 3599074de08b6d7d…

MALICIOUS

Office (OOXML) / .XLSX

688.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-05
MD5: 3ef5d760e2ec5d47005edc4c7c573bd9 SHA-1: 17e41051e3800219ede8f6be533bb111d6fa137b SHA-256: 3599074de08b6d7d574bffbf723b4dc45067438910d1dc94fd61ac005cfaed18
100 Risk Score

Malware Insights

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

The file is an OOXML 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 size and entropy, strongly suggesting it's being used to deliver a secondary exploit or malware. The embedded OLE object and its anomalous stream are the primary indicators of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/n4.W3KaWm 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
b81515dab07567d253d054194a8f5b9bbaf25808e1f0fd271dcf7ba3be12d54c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/n4.W3KaWm 947712 bytes
ooxml_oleobject_00_ole10native_00.bin
cffed735664865fc16c2997da7831e8ca9b7db1a60a67f3e43ea8ed9daab558b		 ole-package OOXML xl/embeddings/n4.W3KaWm Ole10Native stream: OLE10NaTive 937617 bytes

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