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

Static analysis result for SHA-256 8e3fccc24097d7b8…

MALICIOUS

Office (OOXML) / .XLSX

617.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-09
MD5: b4fe8db07a590864a968bb6a44416549 SHA-1: 23a11152bcb7529423627bebc95a9dd2537ab3e9 SHA-256: 8e3fccc24097d7b8b4a784a1060e629b2e71ced25cac713858688e7dc6f93095
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Attachment

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malicious documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tDrV.JRMTPqG 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
e2a9634424df24d29e64895714136cbd6182e333a231058f5aa32e29ed90cc19		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tDrV.JRMTPqG 932864 bytes
ooxml_oleobject_00_ole10native_00.bin
c47bddb156236fc6860a4d11b90344d3ff71ff8576c6adc2ef070ac30d9dfdb1		 ole-package OOXML xl/embeddings/tDrV.JRMTPqG Ole10Native stream: ole10NAtIvE 922900 bytes

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