RTF malware analysis — malicious · 28cb6673b775482c

MALICIOUS

RTF

83.8 KB First seen: 2024-07-29

MD5: 432a2f5af4e1bf29730f042f0d39178f SHA-1: 28615fcfcad3b0dbee3962142a832320711c3ebb SHA-256: 28cb6673b775482ce60bf8b1a6fc4fa2b18ebe505b4ce909a08246c2d34e6a08

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1566.001 Spearphishing Attachment

The RTF document contains critical heuristics indicating the exploitation of the Equation Editor vulnerability (RTF_EQUATION_EDITOR) and forces OLE activation (RTF_OBJUPDATE). This suggests the document is designed to download and execute a secondary payload, likely leveraging embedded OLE objects (RTF_OBJDATA, RTF_OBJEMB). The exact nature of the payload could not be determined due to the truncated document body.

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001d47.bin` `dcd850d1e520e6276b5da7d3d1d466fc4dde643e288045b93c22765b80114a01`	rtf-objdata-decoded	RTF \objdata at offset 0x1D47	1744 bytes

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