RTF malware analysis — malicious · 7a8ccad40f6f3446

MALICIOUS

RTF

99.3 KB First seen: 2024-10-07

MD5: 72dd90d54b9dcfe691ff308a9cacb72f SHA-1: 79997f6339815718fdd17e5e4c47a6ea08a5549f SHA-256: 7a8ccad40f6f34469ac64889b09cf44c53d2bb58dbb5e900abcc9703fa62ccb4

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of CVE-2017-11882. The \objupdate directive forces OLE activation, triggering the exploit. The embedded OLE object, decoded as objdata_00_off00000c27.bin, likely contains shellcode to download and execute a secondary 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_off00000c27.bin` `8957547e32d5b7fa735197ec0aae2f3a05085783700578841bd01ced8d6e20eb`	rtf-objdata-decoded	RTF \objdata at offset 0xC27	2021 bytes

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