MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
T1059.005 Visual Basic
The sample is an RTF document containing an embedded OLE object that exploits a known vulnerability in the Microsoft Equation Editor. The ".objdata" section and the ".objupdate" directive indicate that the embedded object is designed to be activated, likely triggering the Equation Editor exploit. The heuristic "SE_ENABLE_LURE" suggests the document also contains social engineering to prompt the user to enable editing, further facilitating the exploit execution.
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_off00004ab9.bin8bb7f0ac8d5c3fce617e72c46d277b8f1ea1ba412a278a2f6adc6be6b33cd420 |
rtf-objdata-decoded | RTF \objdata at offset 0x4AB9 | 1605 bytes |
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