RTF malware analysis — malicious · d43cc5a3d193c332

MALICIOUS

RTF

106.4 KB First seen: 2024-09-27

MD5: d805f910e1756735e34523281088f2ed SHA-1: 243f7b70a0fde02f3afd3b7d2fe99a786cb505db SHA-256: d43cc5a3d193c33295a70f6861ee2d0ddbeeb165ab106018f06a38cc5297eb57

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that contains embedded OLE object data, specifically targeting the Equation Editor vulnerability. The \objupdate directive indicates an attempt to force OLE object activation, which is a common technique for exploiting this vulnerability. This exploitation likely leads to the execution of a secondary payload, although no specific download URL or script was directly extracted from this sample.

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_off00001fc2.bin` `d10834b7d451b7365cac960b3736391e0cff3f0a56afc5289d0aaf332704bde3`	rtf-objdata-decoded	RTF \objdata at offset 0x1FC2	2084 bytes

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