MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1204 Malicious Link
T1566.001 Phishing: Spearphishing Attachment
T1059.005 Command and Scripting Interpreter: Visual Basic
The sample is an RTF document that leverages the CVE-2017-11882 vulnerability in the Equation Editor. The document body contains a lure instructing the user to 'enable editing' to view the content. The presence of OLE object data and automatic linking further indicates exploitation of embedded objects. This exploit is commonly used to download and execute a second-stage payload.
Heuristics 5
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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 2 \objdata section(s) — embedded OLE objects
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Macro/content-enable lure medium SE_ENABLE_LUREDocument instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
objdata_00_off00001cff.bin8f6ec8e39b05f329f8544b1de1723807ff168889a2f7bacf09cfe446574901e7 |
rtf-objdata-decoded | RTF \objdata at offset 0x1CFF | 3720 bytes |
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