MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The sample is an RTF document containing embedded OLE object data, specifically triggering the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" directive (RTF_OBJUPDATE) forces the activation of this embedded object, leading to arbitrary code execution. While no specific script was extracted, the presence of these critical heuristics strongly suggests the document is designed to exploit this known vulnerability to deliver a secondary payload. The document body is heavily obfuscated and does not provide clear textual lures.
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 2 \objdata section(s) — embedded OLE objects
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off000010d6.bin8c91d9119816bd6ea4c7f04924fd7794b40f49a9fe94ad8a15bd46eb34382aa4 |
rtf-objdata-decoded | RTF \objdata at offset 0x10D6 | 1903 bytes |
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