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

Static analysis result for SHA-256 bb3b7c5bac9c95d1…

MALICIOUS

Office (OOXML) / .XLSX

706.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-18
MD5: ef16ba28035b57054f97bfeff17ad1bb SHA-1: e179406541dd69adb937d845b57dea67beb1fe51 SHA-256: bb3b7c5bac9c95d161ae230b3ac2012f09ef594b93abe8510e9b995bcf53f688
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 a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary stage.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/XUa62yQ2.etNFm 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
1afbc7803805e00665d57e57de96c72df40fd4d519f55ebe2d92980708270040		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/XUa62yQ2.etNFm 957440 bytes
ooxml_oleobject_00_ole10native_00.bin
939685f41368b98ce79e773ec16811bf180cf363b5ebac0ef47665f73c0c5c07		 ole-package OOXML xl/embeddings/XUa62yQ2.etNFm Ole10Native stream: Ole10NatIvE 947214 bytes

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