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

Static analysis result for SHA-256 7297b3b888aec7dc…

MALICIOUS

Office (OOXML) / .XLSX

629.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-08
MD5: 9ea5f3681953b5fbd3a2b22d930b7179 SHA-1: d57d0de8079066c694e4714faa889869f5271b91 SHA-256: 7297b3b888aec7dc413d75f9e3c828f1ef590adea759e6da18976c9b1a9f6977
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft 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. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/i2eYP97.gTyM9n2 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
fba9200afa5d4ca4a36a89d77e28575dffb278a5289f70564ca435f17807999b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/i2eYP97.gTyM9n2 886272 bytes
ooxml_oleobject_00_ole10native_00.bin
c0a08fc216218d9d07d64598871db0bdfb7ffd90db3200759ae93a37ddc0d42a		 ole-package OOXML xl/embeddings/i2eYP97.gTyM9n2 Ole10Native stream: oLE10NATiVe 876983 bytes

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