RTF malware analysis — malicious · 8ef995b3622a048d

MALICIOUS

RTF

15.1 KB First seen: 2023-02-20

MD5: 2772ad98ea4b884cfe063422a8013bff SHA-1: 947822fbbc7ec57a2d0ffb1fbf16ded2def255e4 SHA-256: 8ef995b3622a048d166b114cd1bb1cd5876e8817662a3d8f4fd1d305030e0d4d

120 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an RTF document that contains embedded OLE object data, specifically targeting the Equation Editor component. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics indicates exploitation of a known vulnerability (CVE-2017-11882) to achieve arbitrary code execution. This is a common technique for delivering secondary payloads, although no specific payload or download URL was directly extracted from this sample.

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_off00001eb1.bin` `b778330ae5f3ed485207456511b68fc677f5b4f1e89085060ec52b76854e6c04`	rtf-objdata-decoded	RTF \objdata at offset 0x1EB1	1607 bytes

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