RTF malware analysis — malicious · a526dbb71a18964d

MALICIOUS

RTF

10.2 KB First seen: 2022-11-09

MD5: 0573de9ff64df6cfe421822665c175fb SHA-1: 8d7773b0a4cde733d9a2b1b078e8fcde4b007786 SHA-256: a526dbb71a18964d285f264d9672db692939864da3f3c46d7cfb8b1f65955f1e

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of RTF_OBJDATA and RTF_OBJUPDATE heuristics indicates that the document is designed to exploit these components. This exploit likely leads to the download and execution of a secondary malicious payload, typical of a downloader or dropper malware.

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_off00001097.bin` `b1651627d2babe1a43a2eac12bcc68bd42b07a092cca76d39ecbc305e66cfe90`	rtf-objdata-decoded	RTF \objdata at offset 0x1097	1742 bytes

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