MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The critical RTF_EQUATION_EDITOR heuristic indicates the file exploits a known vulnerability in the Equation Editor component. The presence of OLE object data and the ".objupdate" directive further suggest that an embedded OLE object is being activated to run malicious code. The embedded scripts contain JavaScript that appears to be designed to download and execute a second-stage payload, as indicated by the `window.location.url` and `setTimeout` functions, though the exact download mechanism is obfuscated.
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 2 \objdata section(s) — embedded OLE objects
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Embedded OLE object medium RTF_OBJEMBRTF contains \objemb — embedded OLE object
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off000011df.bind695209903d919bfcea5aa347b8dfe138b93b5adbce48eef61ee144d18e253cd |
rtf-objdata-decoded | RTF \objdata at offset 0x11DF | 54754 bytes |
objdata_01_off00032189.bind2d324e28f9f3abf7d31268816f242dc5b73a8f28b0fbb08fc6be0000c82040f |
rtf-objdata-decoded | RTF \objdata at offset 0x32189 | 322519 bytes |
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