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

Static analysis result for SHA-256 9a0a3c9d6f5b6126…

MALICIOUS

Office (OOXML) / .XLSX

670.5 KB Created: 2022-07-21 17:04:09 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-07-05
MD5: 1bc8790f1d491b71fed95ce79c438427 SHA-1: 6cb5de82217cb52554b17cf53b72a6ec8e18a933 SHA-256: 9a0a3c9d6f5b61267bdb3f5f50c20f73f347cd264213fa6442c2e8bd4f07f40c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Office document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, suggesting it's packed or obfuscated. The 'SE_ENABLE_LURE' heuristic confirms the document instructs users to enable macros, a common technique for malware droppers. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a second-stage payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/g3.TBh 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
46fe04071c440ec3a30a5016b6120388523ca4fccddb87547a20e208ac817aa8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/g3.TBh 979968 bytes
ooxml_oleobject_00_ole10native_00.bin
5f613a74f77000eb373ae4b109fe3df12ebe46ef66da3e06c748bec2eeee557a		 ole-package OOXML xl/embeddings/g3.TBh Ole10Native stream: oLE10naTIvE 969808 bytes

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