RTF / .DOC malware analysis — malicious · 646804d53fe1c183

MALICIOUS

RTF / .DOC

64.7 KB First seen: 2023-09-13

MD5: 3abad65647190c6c9c594eae83a64cf0 SHA-1: 8092b11f827508ba91fa38694b1047870e0194a7 SHA-256: 646804d53fe1c183c3887871d0edc480f435672f7bbff2e1e35be91845df5295

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The document body includes a lure instructing the user to 'Enable editing', which is a common tactic for macro-based malware droppers. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly indicates an exploit attempt via the Equation Editor. The SE_ENABLE_LURE heuristic further supports the malicious intent by highlighting the user-enablement prompt.

Heuristics 5

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off00002d38.bin` `25073996da83dca370498d82d84e37df245b3b8bb5acdb456fb1bda5a7b25ba2`	rtf-objdata-decoded	RTF \objdata at offset 0x2D38	1982 bytes

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