MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.001 User Execution: Malicious Link
T1059.003 Windows Command Shell
T1204.002 User Execution: Malicious File
The sample is an RTF document that contains embedded OLE objects, specifically triggering critical heuristics related to the Equation Editor vulnerability. This indicates the document is designed to exploit this known vulnerability to execute arbitrary code. The presence of ".objupdate" further suggests an attempt to automatically activate the embedded object upon opening. The document body is heavily obfuscated and does not provide clear textual clues, but the technical indicators strongly point to a malicious exploit delivery mechanism.
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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Embedded OLE object medium RTF_OBJEMBRTF contains \objemb — embedded OLE object
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00000f7e.bin812f5ebcc9df0177935cbc692bb067138f8c76971261ce62e2bff0b56a51c0c5 |
rtf-objdata-decoded | RTF \objdata at offset 0xF7E | 24782 bytes |
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