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

Static analysis result for SHA-256 bde1fb06968e7672…

MALICIOUS

Office (OOXML) / .XLSX

2.51 MB Created: 2020-01-20 17:22:23 UTC Authoring application: Microsoft Excel 15.0300
MD5: 71aa7d1d5657e98baa7afc8e64091aae SHA-1: c960ee381c0123094f6f710e887036b4a3f24b8e SHA-256: bde1fb06968e7672beb680520d73db25de13421d5b3e8ad20044677f8ec27157
60 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution. No document body text or scripts were extracted, limiting further analysis of the payload.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/biO.0lf91eU contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
40d0f29ec8d237551f282ac486ca9426243f9557f3585279be35163c83484e3b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/biO.0lf91eU 2829824 bytes
ooxml_oleobject_00_ole10native_00.bin
7b96c29f0f129e3e5eba02756780efe5df994b0de424b66b40962bb6c63dd758		 ole-package OOXML xl/embeddings/biO.0lf91eU Ole10Native stream: ole10naTIve 2804752 bytes

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