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

Static analysis result for SHA-256 dbc5a667a2ff62f0…

MALICIOUS

Office (OOXML) / .XLSX

698.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-02
MD5: 0335c9c6282e5715cbff937b9450e6eb SHA-1: 9c5e490374e5010638fbdfbe27ef71fdd86bf5a9 SHA-256: dbc5a667a2ff62f0d600cdfd46ee28190dcd68ddcf10600716a6b05b07291306
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting exploitation of a vulnerability within the Equation Editor component. The document body contains what appears to be a fraudulent invoice, indicating a likely financial scam motive.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Je.6uPAEU6 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
e4a0c513479ee939462d836cdf2eeee1a46fe8d8f1d254dad9cdc4eb2929d8fe		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Je.6uPAEU6 938496 bytes
ooxml_oleobject_00_ole10native_00.bin
4722d27f72a90ce101e1016135a97328f26f44736a708f23922ca261d4ba71c8		 ole-package OOXML xl/embeddings/Je.6uPAEU6 Ole10Native stream: OLe10nAtiVe 928305 bytes

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