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

Static analysis result for SHA-256 5af92a0def6249cc…

MALICIOUS

Office (OOXML) / .XLSX

15.2 KB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300
MD5: 816d333880e9e3ac48c6c2972e315c57 SHA-1: c0f7c4a0f19672fdad4b32642c4f0d7a0c3ade29 SHA-256: 5af92a0def6249cc97bfd12ac3ea0a5df1718501d6968391eb709afdf932594b
120 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate a potential exploit for CVE-2018-0798 due to an anomalous native stream within the Equation Editor object. The document body contains a lure instructing the user to 'CLICK ENABLE EDITING ABOVE' to translate language, which is a common tactic to bypass macro security and execute malicious content.

Heuristics 4

  • 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.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
12995f4809c3b0e9eeae70d4e39e4b0c16746616b39415281159efad1e30b282		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
13c5d433e4cab81246666b3be5bef95508e93998fd723d89614ec7dd7156dcee		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10natIve 2159 bytes

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