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

Static analysis result for SHA-256 9b27d851a8b618d1…

MALICIOUS

Office (OOXML) / .XLSX

8.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 5bb9bc779751fd004c3adce183d6df3a SHA-1: 7d03f60e3580833b0384ad247b719ac44dd90797 SHA-256: 9b27d851a8b618d10568ffdfd635a08ee4ee29e7b8b915a4e9d1e26f001f3160
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution. This suggests the file is designed to exploit this vulnerability upon opening.

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
0bacfffe57ab16eff225ef67ebed85215bb59e70986eb87b7a5d3a403c404516		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
176512a2b99d49bc6bdfb589bc9aae5ec0f2db450b87a4d433d32e5d0233d38a		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10nAtive 2018 bytes

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