RTF malware analysis — malicious · 8f6adbbbaf0b3300

MALICIOUS

RTF

46.7 KB First seen: 2023-09-07

MD5: 5c2b9063897b742f636bbed0c5dc7884 SHA-1: 3404313219eee130dd02c51dca53fb9beae3d51a SHA-256: 8f6adbbbaf0b3300c19c11245feda8a509e65af72091eccb5d5009635986ebde

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution: Malicious Link T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an RTF document containing OLE object data, specifically targeting the Equation Editor vulnerability. The document body presents a lure about financial audits, instructing the user to 'Enable editing', which is a common tactic for macro-based malware. The presence of RTF_OBJUPDATE and SE_ENABLE_LURE heuristics further supports this attack pattern.

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_off00002760.bin` `a26072d3dc3d123ca20aa76617419cd68be420d199b557808b25c0422dd16166`	rtf-objdata-decoded	RTF \objdata at offset 0x2760	1615 bytes

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