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

Static analysis result for SHA-256 8200589354a9dc05…

MALICIOUS

Office (OOXML) / .XLSX

15.0 KB Created: 1996-10-14 23:33:28 UTC Authoring application: Microsoft Excel 15.0300
MD5: c5ee2bbbe4136e2d035657a3d03b83f2 SHA-1: fad4946615fa94a95dc42f89590aa9db2528bbb2 SHA-256: 8200589354a9dc0521138f3063f544be6a19b44db2d9cb02e19bb5921bdf94ff
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, which is known to be exploited by CVE-2018-0798. The document body contains a lure instructing the user to 'ENABLE EDITING ABOVE' to view the content, which is a common tactic to bypass macro security settings and execute malicious code. The embedded OLE object is the primary indicator of compromise.

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
d890ca27bffef5a1134adaba8937e96092b221385a3b013bbc7e2dcbcfda6e6f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
9b39901f6303b8b1968232e42b7288a2c4862126a8f2cc992e22c81d1f1ad22e		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10natIvE 1914 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.