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

Static analysis result for SHA-256 2f628564aa70fc6a…

MALICIOUS

Office (OOXML) / .XLSX

699.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-11
MD5: 755f2a6323a06f958b5e4ec81913b15c SHA-1: c61cb78ea3723e3c40704d31cef044131e8cdd76 SHA-256: 2f628564aa70fc6afa18d42917b120985437306ce0acd2aec7a8051b0988ee6d
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 a Equation Editor object with an anomalous Ole10Native stream. This structure is indicative of an exploit targeting the Equation Editor component, likely to execute a secondary payload. The document body presents as an invoice, a common lure for phishing or social engineering attacks.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/QFsz5Aj.RR6NA 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
baee78df1a398ac2b5c9c6efd2fca23c136e474bb5ed7c9d4efd292f418b9618		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/QFsz5Aj.RR6NA 955392 bytes
ooxml_oleobject_00_ole10native_00.bin
e0805694e2112c225989256e5b3a3364c66dbb8116878045d5d29df730d819b8		 ole-package OOXML xl/embeddings/QFsz5Aj.RR6NA Ole10Native stream: Ole10nAtIVe 945252 bytes

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