RTF malware analysis — malicious · 297a951d047d377a

MALICIOUS

RTF

105.9 KB First seen: 2024-10-05

MD5: 93f8cd6440e951545875706461d25854 SHA-1: 789028f40f3a78ffcce107c4677e91b75bac0e6d SHA-256: 297a951d047d377a45195c4a9e3c1c7a3a5b4ac6cc58b8e2c17d3ec7a2f09485

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The \objupdate directive indicates that the OLE object is automatically activated upon opening the document. This exploit is commonly used to download and execute a second-stage payload, hence the high confidence in this attack pattern.

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_off00001677.bin` `963a21e3f37f5e2fa6bc11c8de74f4c3b831139c73e1b11c92bf30d0e78d6fea`	rtf-objdata-decoded	RTF \objdata at offset 0x1677	2157 bytes

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