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

Static analysis result for SHA-256 9689b28d5388e674…

MALICIOUS

Office (OOXML) / .XLSX

35.8 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-28
MD5: b8ba8f081158988cf27bc7bf7304797a SHA-1: 9486ad74228cb61a51e0266a9f79b27d6927861d SHA-256: 9689b28d5388e67473780616fe3bd59e5adc1b41076e85cd80ad4e605b6df807
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: COM Hijacking

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous Equation Editor native stream properties. This suggests the file is designed to leverage this vulnerability to execute arbitrary code, likely as a downloader or initial access vector.

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
37f922362eb641cb6cd1494fa636bc8d8c9b318d2a0c11250828620b52cd1215		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
e427b13186faee739fbe68942fa3e6333247c18bf22acddb921f8e46e066d434		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NaTiVe 1647 bytes

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