Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 64dd6710787bcd38…

MALICIOUS

Office (OOXML)

60.1 KB Created: 2018-06-17 08:38:16 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-03-10
MD5: eea8012be96a3b121fbb746466a9fba6 SHA-1: 25b8d28f629dcd34c725b482ea23acb28e45d981 SHA-256: 64dd6710787bcd3843832eff361f5c68d9b073c60b78a7308269650fe2e5add8
120 Risk Score

Malware Insights

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

The sample is an Office document with a lure to enable editing, which is a common tactic for macro-based malware. It contains an embedded OLE object, specifically an Equation Editor object, which is associated with CVE-2018-0798. This suggests the document is designed to exploit this vulnerability to execute a malicious 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: d3c715c52bee5d12cbc3712ad8f3a06ba7870959ec20bdbf179120598c0ddd4e
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1913 bytes
SHA-256: fa5057b461ef9af10aa21a3726d598462322ea916dbaa55927add3eed5899b20

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