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

Static analysis result for SHA-256 01522b046102891d…

MALICIOUS

Office (OOXML) / .XLSX

2.55 MB Created: 2020-01-20 17:22:23 UTC Authoring application: Microsoft Excel 15.0300
MD5: 3c37bb68b7291e1801e6439fd275ec9a SHA-1: 9944604f8082b6968ee43b18058d3fca1ae73c78 SHA-256: 01522b046102891deaf301f6dfea2c0f39d290b118771c9aecba1b7eeecfb952
100 Risk Score

Malware Insights

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

The sample is an Excel 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 size, strongly suggesting it is being used to exploit a known vulnerability. The document body contains a list of shipping companies, likely a lure to encourage opening the document.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/BJ.XvDbh 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
6ed503c3911f18cdb9e415a72a705c5222216d845602d0fa755c5a4efd322bc0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/BJ.XvDbh 2899456 bytes
ooxml_oleobject_00_ole10native_00.bin
ac4a77de7eec04a452104a214a0345622aea297a973a9d84559924408a39df2e		 ole-package OOXML xl/embeddings/BJ.XvDbh Ole10Native stream: olE10nATivE 2874199 bytes

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