RTF malware analysis — malicious · 44f91a4273c63cb7

MALICIOUS

RTF

107.8 KB First seen: 2024-07-24

MD5: d28a4f03a2969a60dda6a00aacc0d18e SHA-1: 9620418735710a25e8dd3a0267c38c80c63843bd SHA-256: 44f91a4273c63cb7e0cf0dbad2c21ba5461780c5b821904148d5a4ab2bfdf81a

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 the OLE object to activate, triggering the exploit. The embedded OLE object data is likely a secondary payload or exploit stage.

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_off00000ac0.bin` `bcc22a231a51dfd5a36470cf062c42383f64e0fb48a5db150a5500eb7bb56d68`	rtf-objdata-decoded	RTF \objdata at offset 0xAC0	2467 bytes

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