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

Static analysis result for SHA-256 303f771c2bffee2b…

MALICIOUS

Office (OOXML) / .XLSX

644.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-28
MD5: 7af97fd132634f475fa300749be47a57 SHA-1: e48e03b1b36863b78e93925f9b7a4d0d282c28a2 SHA-256: 303f771c2bffee2b28ee472e466922186e06da0f74f17f3ba17828ad26542290
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload within its Ole10Native stream, with a declared inner size significantly larger than the stream size, suggesting potential obfuscation or a packed payload. This indicates an attempt to exploit a vulnerability within the Equation Editor to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/xAjLpn.QbccM 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
dde9786159d2e80b5844740cff8029c40f84b88b32aab1fb6984d0b1071bf337		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/xAjLpn.QbccM 912384 bytes
ooxml_oleobject_00_ole10native_00.bin
d3cc84c70726004151c6f0831ae56916e04ca57b2ddb8279365e0c9b35235e13		 ole-package OOXML xl/embeddings/xAjLpn.QbccM Ole10Native stream: Ole10NATIvE 902919 bytes

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