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

Static analysis result for SHA-256 fef52fe6005cd8c5…

MALICIOUS

Office (OOXML) / .XLSX

598.8 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-06
MD5: 28f86ef15bf4524e093c6a4ca2b9f622 SHA-1: 24b59cca2a4d8110be686439df811385eeb1a7ce SHA-256: fef52fe6005cd8c5c073e8f8bce99daff99b799339dcf7b5aad98ddf1483ae99
100 Risk Score

Malware Insights

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

The file is an Office document 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 header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This indicates the document is designed to exploit this vulnerability to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lp.Lcqv 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
a96329d6c74790101f31635ad1cfb080a52069a54158bc72160510dcfeda228f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lp.Lcqv 819200 bytes
ooxml_oleobject_00_ole10native_00.bin
d0268b1293c7dc93648a7c1543f7df12e606387ff5930179654f7b0d34d3bf23		 ole-package OOXML xl/embeddings/lp.Lcqv Ole10Native stream: OLe10naTiVe 810092 bytes

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