MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The sample is an RTF document that contains an embedded OLE object. Heuristic analysis indicates a critical vulnerability, CVE-2017-11882, related to Microsoft Equation Editor. This vulnerability is commonly exploited to achieve arbitrary code execution, typically to download and run a second-stage payload. The presence of ".objupdate" further suggests an attempt to trigger the OLE object's activation. Given the nature of the exploit, the initial access vector is likely spearphishing.
Heuristics 4
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CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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Automatically linked OLE object high RTF_OBJAUTLINKRTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
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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_off00000ec4.bin |
rtf-objdata-decoded | RTF \objdata at offset 0xEC4 | 4158 bytes |
SHA-256: 8defc5c8a861db4f28692ff15fb6c41e079e76f34f046518234967bcafbc9e2b |
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