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

Static analysis result for SHA-256 929df8a15e583ad6…

MALICIOUS

Office (OOXML) / .XLSX

615.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-01
MD5: c0540e9242a21eb4de07fb232601dd0e SHA-1: de322fcde28b0a90d2e89e6545c2cf32c2cc714d SHA-256: 929df8a15e583ad6b64698fb702cf44183f0d726d86cada07cf072d7f9f74913
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream, suggesting it's designed to exploit the Equation Editor vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/y7YZlvqrf.T5xd 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
a0d94d4532a56e99e580f79e90da825f1679d57c1f3495fafd765e6760a6987f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/y7YZlvqrf.T5xd 836608 bytes
ooxml_oleobject_00_ole10native_00.bin
ecf3cec2c816df6958e3464254aaefa19db0435fa142c57dbcc9d0db853089cb		 ole-package OOXML xl/embeddings/y7YZlvqrf.T5xd Ole10Native stream: OLe10nATIVE 827783 bytes

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