MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1059.001 PowerShell
T1204.002 Malicious File
The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-1997-2455 or similar). The ".objupdate" directive indicates that the OLE object is designed to be activated automatically upon opening the document, which is a common technique for exploiting this vulnerability. The heuristics strongly suggest this is a delivery mechanism for a secondary payload, likely executed via PowerShell given the commonality of this technique.
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 1 \objdata section(s) — embedded OLE objects
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00000d35.binbb2d15d784e356e5baafcbae73e3c80ab9f33ecdf5244a6db90e96618a51c6b2 |
rtf-objdata-decoded | RTF \objdata at offset 0xD35 | 1529 bytes |
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