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

Static analysis result for SHA-256 95b6d7f8ddb6eec2…

MALICIOUS

Office (OOXML) / .XLSX

664.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-21
MD5: 8a85ff177bf68f376936e23909361d15 SHA-1: 5d0227f79af19e3f5bf7dc110275b3681e3cf056 SHA-256: 95b6d7f8ddb6eec2fbc9588fd85b1248da7f1429a6a266d95df5493bab5e7eb4
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This indicates the document is designed to execute a malicious payload when opened.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/sNzTw2iP.19EP 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
88d7254033d84a5ce259dc1829cc47d14c28ed1c83509a110b0ab93a19e2d469		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/sNzTw2iP.19EP 956928 bytes
ooxml_oleobject_00_ole10native_00.bin
d6e17dad3e43a5ad9cdf1641d057ff44165f87d7d1580d83feab5d417d8d9d9e		 ole-package OOXML xl/embeddings/sNzTw2iP.19EP Ole10Native stream: oLe10NatIve 947135 bytes

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