RTF malware analysis — malicious · 6ce2f98dabddfa3d

MALICIOUS

RTF

81.8 KB First seen: 2024-08-18

MD5: 3c068c1b622afbe60650f8f8cd85b594 SHA-1: 29f53dbfcbf23b13ad89bc348657fe31cf648752 SHA-256: 6ce2f98dabddfa3d155c5cfe4481f152880310786cf9dc83c513c663fd47567c

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains OLE object data and triggers an objupdate event, indicating it attempts to activate embedded content. Crucially, it fires a critical heuristic for Equation Editor exploitation, suggesting it leverages a known vulnerability (CVE-2017-11882) to achieve code execution. The embedded OLE object likely contains the exploit code, which, upon activation, would lead to the execution of a secondary payload.

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_off00001135.bin` `ab666cbe569f596f15b75c7b93a1eb4f591b4b089ad4cc209daccadc73bc6f43`	rtf-objdata-decoded	RTF \objdata at offset 0x1135	1697 bytes

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