Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4eaae933643a5680…

MALICIOUS

Office (OOXML)

164.8 KB Created: 2019-06-18 09:03:55 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-05-25
MD5: 91341db152ecb17284f14874f0cf9935 SHA-1: 7dc1da363d851a6a669a97878e2549578e4906bc SHA-256: 4eaae933643a568008c129c600c6d0bb0651673795b8e6c0edfdf91a5e3f2561
120 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as an Equation Editor object, which triggers heuristics for CVE-2018-0798. This indicates the document is likely designed to exploit a vulnerability in the Equation Editor to achieve arbitrary code execution. The embedded object and associated extracted files are the primary indicators 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
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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: 4f9cec8a1a0c1c978c739fe9038738228c67243a4f079b53228c3f4b64326f65
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10naTiVE 1980 bytes
SHA-256: a7327b910a1bb775c037707af16490c87c0ad6b9a3122091478adc3938e5ecb9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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