Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 296c5aaa026cc04e…

MALICIOUS

Office (OOXML)

652.4 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-06-04
MD5: 703f3359683bd2019f72436b67cb560f SHA-1: 8c26b340d2106f7847338b85aa49e0c0bd09f09a SHA-256: 296c5aaa026cc04ea693ac6708d4262b27e29c20c21e7cc88ef1dd7ebbe9715c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is being used to exploit a known vulnerability for client execution. The anomaly in declared vs. actual stream size further supports this.

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.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 951296 bytes
SHA-256: a2da8c871cb49926a4abaf9f03700fbcfd542ad801701adcceb6f1ce9bf3774a
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NATiVe 941282 bytes
SHA-256: bea00c7eb227d2f82d8045c4fdf1388eeb67d80e6605d698328ad1a0f4ca953e

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