RTF malware analysis — malicious · 407a90cecaede971

MALICIOUS

RTF

201.8 KB First seen: 2023-07-13

MD5: b645601ba4798362e867d97b9d4e60ff SHA-1: 4c648231f3137161bc07f340ce374fcb8640e427 SHA-256: 407a90cecaede9714e782434ca4378badddb6c77df3a5d2a6a78869c23dfb8bd

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains OLE object data and specifically triggers the Equation Editor exploit, indicating an attempt to execute arbitrary code. The \objupdate directive forces OLE activation, suggesting a malicious payload is intended to run upon opening the document. No specific family could be identified, but the exploit vector is clear.

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_off00001b39.bin` `b7a0ef10711db1b425537a0e50a306e90cbe9e0729e769f2b38bc3b20f495040`	rtf-objdata-decoded	RTF \objdata at offset 0x1B39	62176 bytes

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