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

Static analysis result for SHA-256 60be7a9a91beb6bc…

MALICIOUS

Office (OOXML) / .XLSX

890.4 KB Created: 2012-07-25 13:58:16 UTC Authoring application: Microsoft Excel 14.0300
MD5: 534a430e97d7d27488f2eb80fa529243 SHA-1: 7211c0061c85eabaae8c3826934ac717a72e5694 SHA-256: 60be7a9a91beb6bc2fbbe724f2e28ff1780af3cc8269e3706276f28dfc8e273f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a vulnerability for client execution. The presence of an embedded OLE object within an Office document strongly implies it was delivered via spearphishing.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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
d2e80331b1a9b1ea38fdb54dad3f1eb7064e468c3a0c0d92fbb4270e61a072ba		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 846336 bytes
ooxml_oleobject_00_ole10native_00.bin
56d5bbb45a3085fd77a533e188c21ff4b71fb1be3e7cbe1c109a78a76d3b54f8		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10nAtive 837567 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.