RTF malware analysis — malicious · 5476cf76d600ffb3

MALICIOUS

RTF

61.3 KB First seen: 2023-08-09

MD5: 4c86d493d7393a80dc6638a810daed30 SHA-1: f487724d581012ecbed824c16a9b76145319990b SHA-256: 5476cf76d600ffb3bf95b400e39db13fd17acb405acd1216cbe8bcaaa0f5c5cd

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing OLE object data and specifically targets the Equation Editor, a known vulnerability vector. The document body includes a lure instructing the user to 'Enable editing', which is a common tactic for macro-based malware or exploit delivery. The presence of the RTF_EQUATION_EDITOR heuristic strongly indicates an attempt to exploit this component.

Heuristics 4

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00004045.bin` `5ae771974e01aa7f61dbcce284375c6b721ccfe284149fc71c591bd557a0e2af`	rtf-objdata-decoded	RTF \objdata at offset 0x4045	1470 bytes

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