MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The RTF file contains embedded OLE objects and specifically triggers the Equation Editor vulnerability, indicating it's designed to exploit this known weakness. The ".objupdate" directive suggests that the embedded OLE object is automatically activated upon opening the document. The extracted document body contains obfuscated VBA-like code that appears to manipulate strings and potentially download or execute further stages, though the exact functionality is obscured. This points to a classic 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 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_off00001269.binea5924c5ecc3343aba1402622084c0716d9e14c592bceb5112fa45ab31109050 |
rtf-objdata-decoded | RTF \objdata at offset 0x1269 | 13607 bytes |
objdata_01_off00008ddf.binc76143411a64e196bc874d749764d9bc501945a5ef088579e6fdfcc29cce7a83 |
rtf-objdata-decoded | RTF \objdata at offset 0x8DDF | 275202 bytes |
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