RTF malware analysis — malicious · ade4f2ab855284c2

MALICIOUS

RTF

79.1 KB First seen: 2024-09-28

MD5: bb08f924d8e1bdc601c2ff9b31e10e0f SHA-1: 2bb89b597719aeb1c1e2b2625f6eea7b3c868c00 SHA-256: ade4f2ab855284c27728ce653ff5e2d6155f293a263313c340895cd2a1916692

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that leverages the Equation Editor vulnerability, indicated by the RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics. The embedded OLE object data (RTF_OBJDATA) suggests it's designed to trigger code execution upon opening. While no specific payload or URL was directly extracted, the exploit pattern strongly implies the document's purpose is to download and execute a secondary malicious 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_off0000126b.bin` `e8ea63902571073930b0d49a18fc5c1d9d1951f7d4bf5b35a37fa0927f63f8a0`	rtf-objdata-decoded	RTF \objdata at offset 0x126B	1572 bytes

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