MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
T1059.005 Visual Basic
The file is an RTF document containing an OLE object with a split Equation Editor ProgID, indicating an attempt to exploit CVE-2017-11882. The ".objupdate" heuristic confirms that the object is configured to activate automatically upon opening. The document body contains a lure instructing the user to 'Enable editing', a common tactic to bypass macro security. This suggests the document's primary purpose is to exploit the Equation Editor vulnerability to gain initial access, likely to download and execute a secondary payload.
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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\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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Macro/content-enable lure medium SE_ENABLE_LUREDocument instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00000b27.bin6817b0fb0c76ca84f610ec92ed189d3d0be64471fb2b3d8799dc9faa5b87b9ce |
rtf-objdata-decoded | RTF \objdata at offset 0xB27 | 1778 bytes |
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