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

Static analysis result for SHA-256 481456c561dc3fab…

MALICIOUS

Office (OOXML) / .XLSX

713.8 KB Created: 2022-07-21 17:04:09 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-03-09
MD5: d6fec7ecd9ca469468b7050830fc353b SHA-1: 9732a08ff7097ba2b3ebe6346a80a9e5dca7006a SHA-256: 481456c561dc3faba47b833b491bd0378a0b372e8de01ae80a56e4640a15b01d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File T1566 Phishing T1566.001 Spearphishing Attachment

The sample is an Excel document containing an embedded Equation Editor OLE object, which is a known vector for malware delivery. The document body contains a lure instructing the user to 'enable editing' to view the document, a common tactic to bypass macro security. The OLE object's Ole10Native stream has an anomalous size, suggesting it contains a payload. No scripts were extracted, but the presence of the OLE object and the lure strongly indicate a downloader or dropper functionality.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/iQNu6S16Q.1UM4S 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
4f82f5472e1fc448dcb594b7a7dbccc4d78cce7fcfff4055d63e7cbdce3ca2b1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/iQNu6S16Q.1UM4S 1062912 bytes
ooxml_oleobject_00_ole10native_00.bin
f3c66858693e21e71ffaa2521a241d7c40e5fee3b8070a0bf3b9479f6f30b00b		 ole-package OOXML xl/embeddings/iQNu6S16Q.1UM4S Ole10Native stream: oLe10nATiVE 1052052 bytes

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