MALICIOUS
122
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
T1059.003 Windows Command Shell
The sample is an RTF document that leverages the Equation Editor vulnerability (RTF_EQUATION_EDITOR) to execute arbitrary code. The ".objupdate" heuristic indicates that the embedded OLE object is designed to be activated automatically, likely to trigger the exploit. The decoded object contains a PE file, suggesting the document's primary purpose is to download and execute a second-stage payload.
Heuristics 4
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Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITORRTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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\objupdate forces OLE activation high RTF_OBJUPDATERTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
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OLE object data medium RTF_OBJDATARTF contains 1 \objdata section(s) — embedded OLE objects
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00001ab4.bina5374488e61f62a9e1e945571566283d2f28fdb0c2447ffc7c71e13a56e30764 |
rtf-objdata-decoded | RTF \objdata at offset 0x1AB4 | 33023 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
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