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

Static analysis result for SHA-256 3a7eb7702f96158d…

MALICIOUS

Office (OOXML) / .XLSX

647.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-31
MD5: 492bccdc4047ede086281163baf5266c SHA-1: ce89d23a3bb40258f5960b2198834459e441aacd SHA-256: 3a7eb7702f96158d240f83d8e7eae604fb90b56de019adb1c3433bd9089dd31d
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (XLSX) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a known vulnerability within Equation Editor to execute arbitrary code. The embedded object's path and stream name are noted as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VfMTSgsQL.hBV 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
fd8459bae85c8f4e115a5f65442f5a290f6014a66b27441887dc65bdabcae62d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VfMTSgsQL.hBV 884224 bytes
ooxml_oleobject_00_ole10native_00.bin
b5bc943209b1ae4ab14f9b01964feabe6834c6304ae3eaa51b38f2c68b357da3		 ole-package OOXML xl/embeddings/VfMTSgsQL.hBV Ole10Native stream: Ole10NATivE 874871 bytes

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