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

Static analysis result for SHA-256 8333ca3a89c88586…

MALICIOUS

Office (OOXML) / .XLSX

695.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-10
MD5: 8930c8db79a0f2481fb29f12ff94e84c SHA-1: fe2e7d0189e4c2dbca57822f7f1038af28771de8 SHA-256: 8333ca3a89c88586a7f04334a3146cec1f796f18d3c94a6c81a6e6e54e313f6a
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's being used to exploit a vulnerability. The embedded OLE object is the primary indicator of compromise, likely serving as a dropper for a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/d9ZrygWU.m2 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
b50581ced3ee5168edf7c8f8dbf2bbe72291a1260da7717084d5938109d4ed5b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/d9ZrygWU.m2 992768 bytes
ooxml_oleobject_00_ole10native_00.bin
d52d28d4cc551032ca4435f4887f744af6d0415647a9c5e6e662cf677f1cef65		 ole-package OOXML xl/embeddings/d9ZrygWU.m2 Ole10Native stream: OLe10NatIve 982317 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.