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

Static analysis result for SHA-256 07859e312f5c7a6b…

MALICIOUS

Office (OOXML) / .XLSX

656.2 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-10
MD5: eae70e40416204f3f0351c6c9bca1e3b SHA-1: d239c26729b55d9308beba5481115160ff123eef SHA-256: 07859e312f5c7a6b4467ed28c6fbb8d215126084b0133fc85f8149bfa012873f
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 an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The document body contains what appears to be financial or shipping data, likely a lure to disguise the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jvuU.l57 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
c76547097ff939c67ad85a33950e58579590cb691f69fec971274ec2d79abcc1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jvuU.l57 971264 bytes
ooxml_oleobject_00_ole10native_00.bin
cd04d8cae790e49eb27fc8517a4c7114697111dce29673da4d43752edf198941		 ole-package OOXML xl/embeddings/jvuU.l57 Ole10Native stream: OLE10NaTIVE 961405 bytes

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