RTF malware analysis — malicious · 914b24a04d529655

MALICIOUS

RTF

50.0 KB First seen: 2023-09-09

MD5: 592dd1fe894165940b95381201c91017 SHA-1: fddeaa42be7deaa360c0bccf2886ee019e61d9b9 SHA-256: 914b24a04d5296550980244f762c2fc2acb0b68d70d698ab3ad624c12e4c65c3

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object and specifically triggers the RTF_EQUATION_EDITOR heuristic, indicating an attempt to exploit a vulnerability in the Microsoft Equation Editor. The document body includes a lure instructing the user to 'click Enable editing', which is a common tactic to bypass macro security settings and facilitate exploitation.

Heuristics 5

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off000037c0.bin` `450e9129c2286058eb83b51779c1c48c0e356f6379b8f836db623713efb66426`	rtf-objdata-decoded	RTF \objdata at offset 0x37C0	1544 bytes

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