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

Static analysis result for SHA-256 a12b52e36ef6b562…

MALICIOUS

Office (OOXML) / .XLSX

56.3 KB Created: 2021-03-26 20:24:31 UTC Authoring application: Microsoft Excel 14.0300
MD5: b78fa9b5370e191c4e441026947f02b9 SHA-1: 1e279dc5ca315db1ec6c3c85178aa725cc0bf415 SHA-256: a12b52e36ef6b56210380d4778cb9d862885d81802651ffb79d17dd591976dd3
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 an Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798 within the Equation Editor's native stream, suggesting exploitation for code execution. No document body or scripts were extracted, but the OLE object's nature is sufficient to infer the attack pattern.

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
697ad23d5444b829e1564089f2ab065b4d0ee7dc9a3da7bc753341bbcba68bc4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
2c7370d1c3de151b2e4e4eb2739ed0841569afbd677415d86b1a2e53b36016d2		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NATiVE 1635 bytes

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