RTF malware analysis — malicious · 531d8782bae4b4ba

MALICIOUS

RTF

91.8 KB First seen: 2024-08-22

MD5: 21169a44e4aa7cde16401b3d0dab16aa SHA-1: e85c977db7fdc1a2ff99f17ac966a9f60ca30721 SHA-256: 531d8782bae4b4babfa770b4acdf907dee78744f79452099e6f0ac5afff96c07

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that contains OLE object data, specifically targeting the Equation Editor vulnerability. The ".objupdate" directive forces OLE activation, indicating an attempt to execute embedded content. This likely leads to the download and execution of a second-stage payload, as suggested by the critical heuristic firing for RTF_EQUATION_EDITOR.

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_off00001251.bin` `8a4d183c7a35b958e8df14d4505afe8e20f277e4a51fe293d5aa92619590fa0b`	rtf-objdata-decoded	RTF \objdata at offset 0x1251	1921 bytes

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