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

Static analysis result for SHA-256 de8e15c8fef3fbf9…

MALICIOUS

Office (OOXML) / .XLSX

675.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-25
MD5: 9418752d145c7423054742d17c4dba69 SHA-1: 7c68fc276339a159c833d76a8d1c6d1a19a7947b SHA-256: de8e15c8fef3fbf9357004b85aef7b938a742a9cf0f8727cb4100f002a664cd6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an OOXML file 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 and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor. This is a common delivery mechanism for malicious payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/w9FR.9D 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
55eb8fe35ff6525fc6663fb0b0f31ccdb7450b9363653ed98d1e18ebbfbdbad0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/w9FR.9D 997888 bytes
ooxml_oleobject_00_ole10native_00.bin
343a6173d92cd379112167fc4d8783284489beefc0c897d262489b2f847275ab		 ole-package OOXML xl/embeddings/w9FR.9D Ole10Native stream: oLe10naTiVe 987436 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.