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

Static analysis result for SHA-256 9aca64f799ebca8b…

MALICIOUS

Office (OOXML) / .XLSX

15.0 KB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300
MD5: ea4256d8a008d094f92ee8de4eaa8c8f SHA-1: f15f9d193b453e9b29a1b6a03c9234b036422d9f SHA-256: 9aca64f799ebca8bfb0f82d443c3be6fea43410782abdbad9960bad707e6eefd
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object, which is known to be exploited by CVE-2018-0798. The document body contains a lure instructing the user to 'ENABLE EDITING' to view the content, a common tactic to bypass macro security. This suggests the document is designed to exploit the Equation Editor vulnerability to deliver a payload.

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
b4d0588b7d7c21ced64e8f047103a5aacf1ffd7a6dabc8c269b58e1fa4addc1e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
0c617bcba429ab57fad9e205b9380f6a97c38d4faa4696fe6e9d7347825dc31e		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NAtivE 1875 bytes

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