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

Static analysis result for SHA-256 ad4816c08b7307f8…

MALICIOUS

Office (OOXML) / .XLSX

643.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-01
MD5: 7f456152801da84b6e7227a0d009bdcc SHA-1: e36ea9aa2f560aa1166d034110d9d6343bd92e54 SHA-256: ad4816c08b7307f8e295ab6e15287871aad26bc6dab7e8dfb50d404acd1e4511
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object with an anomalous Ole10Native stream. This structure strongly suggests the exploitation of a known vulnerability within the Equation Editor component to execute a secondary payload. The high entropy of the Ole10Native stream further indicates the presence of packed or encrypted malicious code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7pZ.KnC 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
49321633f0e0b79960b2bf204ddd51381a7014fc65edeeecb4732274c9f2525a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7pZ.KnC 896512 bytes
ooxml_oleobject_00_ole10native_00.bin
dc76561e0a3288180f82a3ef536e9c0cfe2856fb75e0116d0db6823674751221		 ole-package OOXML xl/embeddings/7pZ.KnC Ole10Native stream: olE10NAtive 887004 bytes

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