MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The critical heuristic firing indicates a split hex Equation Editor ProgID and OLE object, and the high heuristic firing shows an \objupdate command, which forces OLE activation. This strongly suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely for downloading and running a second-stage payload. No specific family could be identified.
Heuristics 3
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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
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00000044.binf8f239c35944c877cb73d3d1c7474f17990a3bd74944c4a33d4e3fa826fe7c39 |
rtf-objdata-decoded | RTF \objdata at offset 0x44 | 31899 bytes |
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