RTF malware analysis — malicious · 196a71cc3b90f4cb

MALICIOUS

RTF

11.4 KB First seen: 2023-03-23

MD5: a169ebcc244ae373d09de5a1eeea8cb1 SHA-1: 72d55ebf28f6e7fc985e646ddcaaff45ce8c0776 SHA-256: 196a71cc3b90f4cbfd85a9c29cfdaae5513527853bf15ae234270fab67a6d780

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 OLE activation, triggering the exploit. The decoded OLE object data is likely a payload designed to download and execute further malicious content.

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_off00000b47.bin` `d9b1d652ebbb6ef733a42f4bd9140fbf917afc2abf535bbbfb4528a422ed9b74`	rtf-objdata-decoded	RTF \objdata at offset 0xB47	1855 bytes

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