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

Static analysis result for SHA-256 94c3f8dc83d63896…

MALICIOUS

Office (OOXML) / .XLSX

611.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-24
MD5: 7baea973b5d9b183b04005369943fac4 SHA-1: 7f87e5ce00ce7f80dde39515cb9126201d6e7df6 SHA-256: 94c3f8dc83d638962369cdc83d86c342103d7939d57f2d44249f3589fcd28c56
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a known vulnerability. This technique is commonly used to deliver second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/pN1b1H7A.ox 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
19e41f47e8ecf845421874f7bbff6cf769e2d089f20df4499fbbf15b8162d7f6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/pN1b1H7A.ox 827392 bytes
ooxml_oleobject_00_ole10native_00.bin
f59a07e519775352bde2691c09975460acba4e2e38c0e87f752f2023a2d5f909		 ole-package OOXML xl/embeddings/pN1b1H7A.ox Ole10Native stream: OlE10naTIve 818388 bytes

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