Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ffa91bd3f202250e…

MALICIOUS

Office (OOXML)

724.8 KB Created: 2020-12-03 11:39:27 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-02
MD5: a34fc64886ca44a3a069818923f992ad SHA-1: a8ac4e385b5eb73c58e4ef36e9a93387110b89b1 SHA-256: ffa91bd3f202250e159c6500dcf6c8d140b25eec4861e9b8e29370854061f43b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is being used to exploit a vulnerability for client execution. The document body contains a list of electronic component part numbers, which is likely a lure or obfuscation.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/OQz2.xSkQ 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OQz2.xSkQ 1003520 bytes
SHA-256: fe6e949ae8f80f732110f8762a39a1044987226913e778c0892321797f0fdc2a
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/OQz2.xSkQ Ole10Native stream: Ole10NAtiVE 993136 bytes
SHA-256: d87ea7ca1f1bec3c72d4db7dc51ffa417c7118d41bd159d3774338e0866f27b1

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