RTF malware analysis — malicious · 7d1ba26b15557e09

MALICIOUS

RTF

18.5 KB First seen: 2023-03-17

MD5: b6157bf7275c8d32dfdd87e4aefa6443 SHA-1: 7add9cff51c5e12ce24585e773fc02347d9dbc95 SHA-256: 7d1ba26b15557e0932bb07292025af17139c1f7e8b9f078ed688533b485b0cb6

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces OLE activation, and the document body contains a lure instructing the user to 'Enable editing'. This combination strongly suggests a malicious document designed to execute arbitrary code via the Equation Editor exploit.

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.
\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_off00002969.bin` `02c74d7d37d8a1569a58edf0eafa0a86cb484a567bf376b7ecdbf223f598a57a`	rtf-objdata-decoded	RTF \objdata at offset 0x2969	1519 bytes

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