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

Static analysis result for SHA-256 2abf8a19fb0a1a90…

MALICIOUS

Office (OOXML) / .XLSX

588.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 445989099c37e8c55201634ba009289f SHA-1: 3c76870086a858016822574c6cb1fa160f6d843a SHA-256: 2abf8a19fb0a1a90fe3f299f2c6b020a962d82afc45c4507c2eb7dbe27a6b2b4
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft 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 via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/puSCg.sEs2 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
a8efc578e4ab15ee22a7a6415e9cf8a69a54eac8353a96c0f37b2bfb5fa0f8a1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/puSCg.sEs2 838144 bytes
ooxml_oleobject_00_ole10native_00.bin
b1e29c3b0e6535b74032d0c6b17a328d8daaf39e5135d9a0acc37371ad149dfa		 ole-package OOXML xl/embeddings/puSCg.sEs2 Ole10Native stream: OLe10NATIVe 829355 bytes

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