RTF malware analysis — malicious · c68b69ed11a1318d

MALICIOUS

RTF

40.0 KB First seen: 2023-07-11

MD5: a83e6f6df3139c61ceacd87c890e809a SHA-1: 6a5f3789adc812b16a9c7fc2f3ef35ffa5b179d7 SHA-256: c68b69ed11a1318dcaac2a4fc45c46133fb94c69e78bbbf714febee806cefa8b

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit a known vulnerability. The presence of \objupdate and a lure to 'Enable editing' strongly suggests the document is designed to trigger this exploit upon user interaction. This exploit likely serves as a dropper for a secondary payload, though no specific download URLs or scripts were directly extracted.

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_off00004248.bin` `2d4e7ca0ba2a3528850337eabf86f43575d8e59545dc96a46f25e4973877baea`	rtf-objdata-decoded	RTF \objdata at offset 0x4248	1916 bytes

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