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

Static analysis result for SHA-256 77730222bc33ee73…

MALICIOUS

Office (OOXML) / .XLSX

662.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-09
MD5: 2d76f2eea6c1dac78ddf3ac1b07563ae SHA-1: 258d16dd41acf887515a895b8004f3fdd73306b6 SHA-256: 77730222bc33ee734f2ccbbeb6845f8e96057f4a00ef6927d7746fe6005b745a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The presence of this embedded malicious object points towards an attack pattern aimed at exploiting software vulnerabilities for initial compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ip0Y.RYy 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
c66ae7c7c7f414f647f65be3b68d41085dd83934eb933e8768bce7d9fa6b3b6c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ip0Y.RYy 917504 bytes
ooxml_oleobject_00_ole10native_00.bin
79099273dd47e84b9aeb1d8986e01206f833197f5716feb8f51fc1c84889e52b		 ole-package OOXML xl/embeddings/ip0Y.RYy Ole10Native stream: ole10NatiVe 908145 bytes

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