Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4e2ff3e325ba464e…

MALICIOUS

Office (OOXML)

686.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-05-22
MD5: 0a5051667ba776766b7ab623dec6da9d SHA-1: 1dee0bf0480295e605fbd8c643cb503d8beff9e0 SHA-256: 4e2ff3e325ba464e7e95f5c0ec3dd10786ecb6dec89398351e55c8a4ffaf6aab
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is being used to exploit a known vulnerability for client execution. The large declared inner size compared to the stream size is anomalous and indicative of a packed or obfuscated payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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/oleObject1.bin 991232 bytes
SHA-256: 225e2f9cfb69c95dd9ef2c40fa4c38c13ac4bf5b118e87bbcc56d58bd41f9ef6
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10nAtIve 980758 bytes
SHA-256: 26ff2503afe199fce742ccfc53953a176a2d29bb6ab150445b2b7806bc51aa68

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