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

Static analysis result for SHA-256 659909c5015a19d1…

MALICIOUS

Office (OOXML) / .XLSX

612.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300
MD5: 73e25abf9218e870ebe65990133f5c2e SHA-1: 870d033c08380119f5b1880a1374e7e097b3423b SHA-256: 659909c5015a19d183541d68afd412856158551fbcf80758c5ada908fc38c2e7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object contains an anomalous Ole10Native stream, suggesting it is being used to deliver a malicious payload. The large declared inner size compared to the stream size further supports this, indicating potential obfuscation or a packed payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/0Heg2n.7Ex5S 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
4e8b4a438264e4c7f63250f1fa117cfb4766da20f8ceae6db68b76326842b6cf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/0Heg2n.7Ex5S 851968 bytes
ooxml_oleobject_00_ole10native_00.bin
ff86577e10d90ac1eaf77844129c00c064b4c34b4de06b3e1913385e49c8be26		 ole-package OOXML xl/embeddings/0Heg2n.7Ex5S Ole10Native stream: OLe10nAtiVe 843061 bytes

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