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

Static analysis result for SHA-256 2697795abaa5ab92…

MALICIOUS

Office (OOXML) / .XLSX

714.6 KB Created: 2023-09-04 21:17:34 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-05
MD5: f878467d428f71698b107b1525c6a42f SHA-1: 329f1bb20ed3cf15548543c439473828bf71e79b SHA-256: 2697795abaa5ab922bfa04bb730b2fd704fcb5084c70debecbdf81f689601ca3
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, identified as an Equation Editor. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and header, strongly suggesting it is a dropper for malicious content. The presence of this specific type of embedded object is a common technique for delivering malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/nOVR1U4.rMe 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
bcf683971a9ba20d15a920c9d5212deb2fb61186b0363683fa5c9d6b3131b658		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/nOVR1U4.rMe 968704 bytes
ooxml_oleobject_00_ole10native_00.bin
47476c57faeb530bef19b52ab96d8cc4197ba8c0e2ce0660493e7887fb4ee680		 ole-package OOXML xl/embeddings/nOVR1U4.rMe Ole10Native stream: Ole10NAtIVE 958725 bytes

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