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

Static analysis result for SHA-256 d8ba98fe2f271587…

MALICIOUS

Office (OOXML) / .XLSX

657.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-07-05
MD5: 563632ea84cbb9b6c4a19223cd655c67 SHA-1: fb0f18bd97964f8ee3dd6e1c7413c1de855e8568 SHA-256: d8ba98fe2f2715873622ec5d987ac06da81077ad593d045b925007680d625025
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits an anomaly where the Ole10Native stream appears to carry a payload, indicated by an unusually large declared inner size and high entropy. This suggests the file is designed to exploit a vulnerability within the Equation Editor to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/t4rjm.f9Fv 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
688ab15147f5b760313c757f393e6b309097672d57da10bdaf2624626f04ce91		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/t4rjm.f9Fv 924160 bytes
ooxml_oleobject_00_ole10native_00.bin
55588bb7116d44d7d70b76c436bbbd278892431c861c64cc81c3bb49c482ded1		 ole-package OOXML xl/embeddings/t4rjm.f9Fv Ole10Native stream: oLe10Native 914065 bytes

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