RTF malware analysis — malicious · 3a64337005639985

MALICIOUS

RTF

36.3 KB First seen: 2023-07-04

MD5: 5d392bce63c065860ea2dc900e862c49 SHA-1: 145be3864b6cf4cd55962a41f3dabfd56f204b37 SHA-256: 3a64337005639985f7d55367e805b8446db8b20b2b1f79254382262c06135ac1

180 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The RTF document contains OLE object data and specifically triggers heuristics related to Equation Editor exploitation and automatic OLE activation. The document body includes a lure instructing the user to 'Enable editing', a common tactic to bypass macro security. This suggests the file is designed to exploit a vulnerability, likely within the Equation Editor component, to execute a secondary payload.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF 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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Macro/content-enable lure medium SE_ENABLE_LURE

Document 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_off00005284.bin` `8e3d07a204ef75d6df01e9a326458cd8ef1aad6f39c554dd1ff54a95f9723271`	rtf-objdata-decoded	RTF \objdata at offset 0x5284	1710 bytes

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