MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.001 User Execution: Malicious Link
T1204.002 User Execution: Malicious File
The sample is an RTF document containing an OLE object with a split Equation Editor ProgID, triggering critical heuristics for Equation Editor exploitation. The ".objupdate" directive forces OLE activation, indicating an attempt to exploit a known vulnerability (CVE-2017-11882) for arbitrary code execution. This is likely used to download and execute a secondary payload, a common technique for initial access.
Heuristics 4
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Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITORRTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
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Automatically linked OLE object high RTF_OBJAUTLINKRTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
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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
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00001ef8.bin2e4671348b49aed43c6b3e45f558b12742eda0cd0536618528c581c98b9636bd |
rtf-objdata-decoded | RTF \objdata at offset 0x1EF8 | 1686 bytes |
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