RTF malware analysis — malicious · 1eeb597e1213e131

MALICIOUS

RTF

33.3 KB First seen: 2024-06-06

MD5: 5e41130a09c6215e9e22e89afe0f3168 SHA-1: a7749b0f3bb1a432ea0c2256fa11ff7d0a1ff256 SHA-256: 1eeb597e1213e13155f18e82fdd758e4f0168474d26ad0493481a92638ecf326

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of CVE-2017-11882. The \objupdate directive forces OLE activation, which is a common technique for executing malicious code. The heuristics strongly suggest this is a dropper for a secondary payload, but no specific family could be identified.

Heuristics 3

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.
\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_off00001732.bin` `d76c49214eded960a7d272452ce78a5d9a7114d62a503f42075c7ca6440d6252`	rtf-objdata-decoded	RTF \objdata at offset 0x1732	1574 bytes

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