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

Static analysis result for SHA-256 acf6272cc20ca1b4…

MALICIOUS

Office (OOXML) / .XLSX

735.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-31
MD5: e46413d6e4171762b627fba68de38951 SHA-1: 2e7d6dc27748090e17d340d53e3765f254d45c9d SHA-256: acf6272cc20ca1b49a18b2c532b4857fb690ca849e5acab504da319a85d8a35e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

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 and a significantly larger declared size than the actual stream size. This strongly suggests the exploitation of a known vulnerability within the Equation Editor to execute arbitrary code. No scripts were extracted, and the document body appears to be a legitimate-looking invoice, likely serving as a lure.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fPK4WWA.wS8KK0d 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
e455b703abb657b3c1198a2b6518fb591dec745199b5ef927d53c07acee2f2c8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fPK4WWA.wS8KK0d 1048576 bytes
ooxml_oleobject_00_ole10native_00.bin
00718c768591a817ce01c2af74615f2e756074eaf70b3dfa00a43c04db10f523		 ole-package OOXML xl/embeddings/fPK4WWA.wS8KK0d Ole10Native stream: OLe10NATiVe 1037957 bytes

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