MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The file is an RTF document containing embedded OLE objects, specifically triggering heuristics related to Equation Editor exploitation. The ".objupdate" heuristic indicates that the embedded object is designed to be activated automatically, which is a common technique for exploiting vulnerabilities like CVE-2017-11882. The presence of VBA code within the document body, although truncated, suggests the execution of malicious scripts to download and run further payloads. The overall attack pattern points to a classic exploit document 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_off0000119b.bin5a3fe9124ad92bfd2b5e0c77706a70ea6ce6d9a0ad3f8926886a2375a8027edd |
rtf-objdata-decoded | RTF \objdata at offset 0x119B | 36348 bytes |
objdata_01_off0002005b.binef0bb09b1fe26f02beb6d60cd6666d2695e11a9b10a3296072737984662626fe |
rtf-objdata-decoded | RTF \objdata at offset 0x2005B | 418576 bytes |
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