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

Static analysis result for SHA-256 fa7e805da55bb66c…

MALICIOUS

Office (OOXML) / .XLSX

631.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-15
MD5: 41cfd2414fbd05c1724ade0024857df7 SHA-1: 926b095c600aedcfaff9d04f4c4af7498f85024e SHA-256: fa7e805da55bb66c704965bb7d94b75333fe32896d932ebe0d8ed095349a7586
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size. This strongly suggests the exploitation of a vulnerability within the Equation Editor component to embed and execute malicious code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/cZX9rY.EvjMFQ 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
c4a845502069e61cd8773e9d797eeae82415dd37dbe6e25b67171e3139af65eb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/cZX9rY.EvjMFQ 914944 bytes
ooxml_oleobject_00_ole10native_00.bin
25fbf14c60b02c41adf7080ae9800e983662bb52b8b8d4f6e42cf5dded1f8a4e		 ole-package OOXML xl/embeddings/cZX9rY.EvjMFQ Ole10Native stream: Ole10NAtiVe 905347 bytes

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