RTF malware analysis — malicious · ae5d5a00197b3b69

MALICIOUS

RTF

5.2 KB First seen: 2022-11-16

MD5: 77a9bfc3397554f0c8bb62fe374f636e SHA-1: 90bbc3acdda141c68a763ce5cb3d20b81377eca4 SHA-256: ae5d5a00197b3b698f46b283b03d1b5750a3f774a45806cab001ff69e397a49a

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF file contains an embedded OLE object with a split hex Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The \objupdate directive further suggests that the OLE object is configured to automatically activate, leading to code execution. The presence of these indicators strongly suggests a malicious document designed for exploitation.

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_off00000070.bin` `cf85af6fcddfd422fe2093dcb5edc16a9a21c7ad66d3266e092c375a85a145db`	rtf-objdata-decoded	RTF \objdata at offset 0x70	2347 bytes

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