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

Static analysis result for SHA-256 5642f91cd9087ccd…

MALICIOUS

Office (OOXML) / .XLSX

647.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-06
MD5: 4cdb9a719de75fde3c4775af41e8ab07 SHA-1: 441dfce1bf57e5971680b7b2a1a8d7bab84a3d07 SHA-256: 5642f91cd9087ccd09def93a6d5ceeda021f1e00faeb4d21ff00e1b70f1aee1e
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet 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 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/vz8G8.lEuonT 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
4a6856887eb15957de52bcef6d6687b361fc376926f898d7aa226252c370a06d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vz8G8.lEuonT 913408 bytes
ooxml_oleobject_00_ole10native_00.bin
9223766b74c234b38eb3c2e0cbcd0a050e5e113edc9f977f0abf2178b5a56cb3		 ole-package OOXML xl/embeddings/vz8G8.lEuonT Ole10Native stream: OLE10NAtiVE 903946 bytes

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