RTF malware analysis — malicious · 931bde5bbc7a01a7

MALICIOUS

RTF

13.9 KB First seen: 2022-10-29

MD5: a9f75e8f452fc360d8f084f461788120 SHA-1: 4ca08fb7c032976d1f8cfe3cc00b64f8b388ed34 SHA-256: 931bde5bbc7a01a7878492bfd9d6508479c499412302860f444c31a7d27cc318

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability. The critical heuristic 'RTF_EQUATION_EDITOR' and the high heuristic 'RTF_OBJUPDATE' indicate that the document is designed to exploit this vulnerability upon opening. This exploit likely facilitates the execution of a secondary payload, although no specific details of that payload were extracted.

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_off00001ad1.bin` `888c71ad9ea601dc5ecca47d3fb2630a544b0781b51ac3e6b7feac5fd2f6485b`	rtf-objdata-decoded	RTF \objdata at offset 0x1AD1	2047 bytes

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