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

Static analysis result for SHA-256 80ec87e06cdd29be…

MALICIOUS

Office (OOXML) / .XLSX

649.8 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: 41ce8db93e9d418192439669dfdcd459 SHA-1: 745ed31c10aa5067065751f5d834e3a7760f3c0e SHA-256: 80ec87e06cdd29beb7ba70d2683738c5b06ed0f335173ff738ba15cc743a0555
100 Risk Score

Malware Insights

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

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, suggesting it's designed to exploit a vulnerability for client execution. The document body contains what appears to be a parts list, likely a lure to disguise the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Uvw.Bci1FH 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
e19302d7a1f1a75596abc220325904f9adf2ce9bd5c430b4a959232619c23af9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Uvw.Bci1FH 932864 bytes
ooxml_oleobject_00_ole10native_00.bin
5f8fe197029b00787f44268a163ffe0a01d0c9b2f7e42e635a9323af91253149		 ole-package OOXML xl/embeddings/Uvw.Bci1FH Ole10Native stream: Ole10NaTIVe 922887 bytes

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