RTF malware analysis — malicious · 9e69d44ac094cb61

MALICIOUS

RTF

89.3 KB First seen: 2024-11-19

MD5: db14a63f71b27da34d0f221d87ac1291 SHA-1: 29249b89a4ccf8b4df4c4888ae458ac6a061778e SHA-256: 9e69d44ac094cb6148a2f76c3af9e98795961e4f3092156adf2f9f3f02d5b162

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1566.001 Spearphishing Attachment

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882). The critical RTF_EQUATION_EDITOR heuristic indicates the presence of a malicious OLE object designed to exploit this flaw. The RTF_OBJAUTLINK and RTF_OBJUPDATE heuristics further confirm that the embedded OLE object is automatically activated, likely to download and execute a secondary payload. No document body or script content was available for further analysis.

Heuristics 4

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001a2c.bin` `863e18fa3af084c3f2599a57fab829106ea0411a932e02b0974d665e6fb10b75`	rtf-objdata-decoded	RTF \objdata at offset 0x1A2C	1828 bytes

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