MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.005 PowerShell
The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The \objupdate directive further suggests that the embedded object is intended to be activated automatically. The document body contains a lure to enable editing, common for macro-based malware droppers. The embedded object, objdata_00_off00004304.bin, is the primary artifact of interest.
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_off00004304.bin5b8acb40534630685026369c0ba6a162a0e2e11b9e87f0c166d5a21cf3884b5c |
rtf-objdata-decoded | RTF \objdata at offset 0x4304 | 1467 bytes |
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