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

Static analysis result for SHA-256 4d06f89ea5c42ff2…

MALICIOUS

Office (OOXML) / .XLSX

1.03 MB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-04-04
MD5: 2ae31d5c5de17942a9306aaf203c6ade SHA-1: 97481b1044a0fa01b162e62d9c040f04d5761687 SHA-256: 4d06f89ea5c42ff2af2038eabb1b633e5fc61439e4f78bb7ef8980bbe0c7077e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Office Open XML (XLSX) file 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 header, suggesting it's being used to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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
04df16178cc59900473775956a8530ee6127244195362f4e0b0aaae10fe89af3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 901632 bytes
ooxml_oleobject_00_ole10native_00.bin
88b5668589dc127b17ab03d929fe8d5553045903e1701e8aa4b11d84e08c5950		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NatiVE 892053 bytes

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