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

Static analysis result for SHA-256 a99e0d793f7849c5…

MALICIOUS

Office (OOXML) / .XLSX

699.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-04
MD5: e7d2292130915d37117d2eb55b590854 SHA-1: 28a1b3b7563943ecdbfe8dc6e9bd0c1acbaf6b71 SHA-256: a99e0d793f7849c50944a266aa8e3a48dbe4ad18920db71931c07e00734b4eaf
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file 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, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated by a user opening a malicious attachment.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/j9DVm.M66 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
4877cf86dc768c19896e170788be3dccebd1f3a57a47d5255263e0985dfa9e86		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/j9DVm.M66 1025536 bytes
ooxml_oleobject_00_ole10native_00.bin
804b90cf37fa2479a6e1b6bf51362e53cd8230fd1004db6e4b4ed33a6bae99b2		 ole-package OOXML xl/embeddings/j9DVm.M66 Ole10Native stream: oLE10naTiVE 1015214 bytes

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