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

Static analysis result for SHA-256 9a8a0b0a4336d704…

MALICIOUS

Office (OOXML) / .XLSX

727.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-14
MD5: 614173f98da8d648f13a147d8f7a6cac SHA-1: 7fa76790db733e9fd80371cec4dd585ab3ff5c86 SHA-256: 9a8a0b0a4336d704137b7fdb6d57e1ba976fb13f096497c6f6f3a1d51105e965
100 Risk Score

Malware Insights

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

The file is an OOXML 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 known vulnerability within the Equation Editor component to execute arbitrary code. No scripts were extracted, and the document body appears to be a legitimate-looking invoice, indicating the lure is likely within the embedded object itself.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/uXX.cDJy1y 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
68d11b2aa7a16e90c606f84749f93ba62bea50897637f957678acff64d69773c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/uXX.cDJy1y 975360 bytes
ooxml_oleobject_00_ole10native_00.bin
a20b1605b2c41c6f7eb0ead10e646a1070b9d0aaec657df09c075336dc8c6025		 ole-package OOXML xl/embeddings/uXX.cDJy1y Ole10Native stream: olE10NATIVE 965314 bytes

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