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

Static analysis result for SHA-256 7c17d1887131f335…

MALICIOUS

Office (OOXML) / .XLSX

138.1 KB Created: 2020-06-30 06:04:05 UTC Authoring application: Microsoft Excel 15.0300
MD5: 23cbe4549524b8d527cf0b1343f8322c SHA-1: c42041ca2574ad36dd214290e7562474374ca8d8 SHA-256: 7c17d1887131f3352338cd50d6a0e23e924f0f76a403117de9e5b906a66715af
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous native stream data within the Equation Editor object. This vulnerability allows for arbitrary code execution.

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.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
58825e315139e733bc1690e0ae9e2e12f30a1fa4723782721ec27bc940ed1db9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
beccd7cb17b816cc6760d6268b35e8eb2550018f4d9cec421946adde81a31192		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NaTivE 1994 bytes

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