MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) via embedded OLE object data. The ".objupdate" directive forces the activation of this embedded object, triggering the exploit. This is a common delivery mechanism for initial access, aiming to download and execute a second-stage payload. No specific family could be identified from the available heuristics.
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 2 \objdata section(s) — embedded OLE objects
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00001099.bin4ba62fef51f64cbdc05d185a06373bd947ac98a91e9441ea190a631c35a8ca44 |
rtf-objdata-decoded | RTF \objdata at offset 0x1099 | 1968 bytes |
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