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

Static analysis result for SHA-256 6bece943eae00945…

MALICIOUS

Office (OOXML) / .XLSX

669.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-01
MD5: 1a368aa24093f7c4fc1e500a23fe5a83 SHA-1: b040144da900e8fff8b0c10d0f73657de557ea17 SHA-256: 6bece943eae00945b984f604c131be96792a1158c8b9177e48033db1a9f103a0
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object identified as an Equation Editor. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, which is an anomalous finding suggesting malicious intent. The presence of this embedded object is a common technique for delivering secondary payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/xZw7.Sla3 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
64e33d6e3eb13f962e91427822d412f3ad82bf35bdef0575f314b36f65d0739a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/xZw7.Sla3 950784 bytes
ooxml_oleobject_00_ole10native_00.bin
baeb13527af44d8f15d64f4602a467dccac1653efbcdcc589175413c6840206f		 ole-package OOXML xl/embeddings/xZw7.Sla3 Ole10Native stream: olE10naTiVe 940611 bytes

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