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

Static analysis result for SHA-256 6c88ec1ba0074ebc…

MALICIOUS

Office (OOXML) / .XLSX

756.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-04-28
MD5: 4b79098a0c0021d36a20f9c06f223bf5 SHA-1: 8b9b0aa78d170eee6d910f7601e9092783baff76 SHA-256: 6c88ec1ba0074ebc7fde3703f157b40af9a0e5751dbedb2e244b0849915c9d67
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document 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 like CVE-2017-11882 for client execution. The document body contains what appears to be a purchase order, likely a lure to disguise the malicious nature of the embedded exploit.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Waw.vdE0wU 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
6e01d5fb8171e2e422a8df4434c05726f6d7b565e7f96bf101639a0dea951fad		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Waw.vdE0wU 1065472 bytes
ooxml_oleobject_00_ole10native_00.bin
16c38e24eadae02b7b9f025e0ac64b0d8f2ccd43bae2c6dbc50ce86b6d8546ff		 ole-package OOXML xl/embeddings/Waw.vdE0wU Ole10Native stream: OLE10natIvE 1054589 bytes

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