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

Static analysis result for SHA-256 026f740db65c8ef7…

MALICIOUS

Office (OOXML) / .XLSX

606.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-11
MD5: f6677fc734f71b2996ec8a53387617f3 SHA-1: 0778f1d5bbae9abbde57b46be76d1d40e98d45ca SHA-256: 026f740db65c8ef7c4f59d1a7dd7b1a8950fef19238470c7c8a37389940ba234
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment 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, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/iIIyBKFL.i5 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
79c49d50bc0eb3c2356967501f32870e7902a39ac1fbc3263c58f18fa82bb35a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/iIIyBKFL.i5 850944 bytes
ooxml_oleobject_00_ole10native_00.bin
a3154cc094689e728b158c7fa5c0d0eebb3de0d12a0c3aed5e6f592648af66a4		 ole-package OOXML xl/embeddings/iIIyBKFL.i5 Ole10Native stream: ole10Native 841985 bytes

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