Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6d4d77e1bbbdf0b0…

MALICIOUS

Office (OOXML)

528.2 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-07-07
MD5: 6b40697a560ceb7a0fdcadd3aa9d67d8 SHA-1: 35ea90da2589b9f0bdaefbe014cd8e59fe15239f SHA-256: 6d4d77e1bbbdf0b098d78b598f511501d9b0be49ed5301ef698a29527d425e5e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017-11882 indicates the file exploits a known vulnerability in the Equation Editor. This exploit allows for arbitrary code execution, likely to download and run a secondary payload. The presence of an embedded OLE object further supports this finding.

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 538112 bytes
SHA-256: 59db06ff6e2838de03cb474bf13d762544ad6bfe731c8f5ab2a695d305f0f19f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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