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

Static analysis result for SHA-256 6685168cbbd67bb8…

MALICIOUS

Office (OOXML) / .XLSX

588.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-12
MD5: 125a1e690bf761396af840e8f4fa4970 SHA-1: 2d4f617d11a3fd091e1c9cc14aeabc03abc73f27 SHA-256: 6685168cbbd67bb8a562bcd22659c6cf7645600194018d79b2f793642d733fa5
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's likely designed to exploit a known vulnerability to execute arbitrary code. The presence of this object strongly suggests a spearphishing attachment attack vector.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/cBPoVDT.g9Y 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
347bcb279063f87f5f9f6dbff7978409b941a473aad2ccdf3a502020e0ea3899		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/cBPoVDT.g9Y 810496 bytes
ooxml_oleobject_00_ole10native_00.bin
c101532e87786582e8c98e6c09533962bdb7211306c1a79ea0929182380d8c88		 ole-package OOXML xl/embeddings/cBPoVDT.g9Y Ole10Native stream: Ole10naTivE 801370 bytes

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