RTF malware analysis — malicious · 934d5a9ac0fa9f51

MALICIOUS

RTF

103.6 KB First seen: 2024-09-22

MD5: 16e108820a6288c25887dbc7f7dff60a SHA-1: d2caa4b7b5c64559d7d506bd6bec191c92c4f592 SHA-256: 934d5a9ac0fa9f518c9eb6db409516699474525c01c3ba5da88f8392517e05ff

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The presence of \objupdate indicates that the OLE object is configured to activate automatically upon opening, leading to code execution. The embedded OLE object data was decoded and analyzed, but no specific payload or further malicious activity was directly identified within this stage. The primary attack vector is the exploitation of the Equation Editor vulnerability.

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_off00001432.bin` `db1c478de31b4e86c2a5ee50f2cdabb4cd8380eaa5752e4d335f6b3850b958ac`	rtf-objdata-decoded	RTF \objdata at offset 0x1432	1963 bytes

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