Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5c39d107ed47e7c5…

MALICIOUS

Office (OOXML)

531.3 KB Created: 2019-05-27 22:54:04 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-07-02
MD5: a5d7271349c0675f89b8a25818fe682f SHA-1: 0001e601fcd49fed0f3090a66b4dedf5c46c3cfa SHA-256: 5c39d107ed47e7c59f06b96d8c50b433324079067e0e52b213ae1458627a73c6
62 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object identified as an Equation Editor object. This is a common technique used to exploit vulnerabilities, such as CVE-2017-11882, to achieve arbitrary code execution on the victim's machine. No scripts or document body text were extracted, limiting further analysis of the specific payload.

Heuristics 3

  • 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 541696 bytes
SHA-256: 922e4254b2e767c11f5188d28685f0e7d884f35edee5e137e8f8d2400f5ed3a8
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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