Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 240840077529af39…

MALICIOUS

Office (OOXML)

45.8 KB Created: 2020-04-21 14:35:51 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-06-01
MD5: db9febcf4da295c8b5daa80613f11109 SHA-1: a6ebb3e01dbbbcd7d30de3998dee61915d2467d9 SHA-256: 240840077529af39fe9d9bc54dc9ff42701db446a7a4b49c3326bc8d6123e1ee
122 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a critical vulnerability, CVE-2017-11882, which is a font record overflow exploit. This exploit allows for arbitrary code execution when the document is opened. The embedded OLE object is likely a secondary payload designed to be executed by the exploit.

Heuristics 4

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • 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.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Suspicious extracted artifact info 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 41984 bytes
SHA-256: 7d751d29589ebe663c3c2806a6bb7296421a30c1626f4165e9c0ecc747a12820
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.86, consistent with packed or encrypted content.

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