RTF malware analysis — malicious · c558594449951e47

MALICIOUS

RTF

25.3 KB First seen: 2023-07-24

MD5: ea3bccaa995da1234bafc89c2768fce0 SHA-1: 774d40e8b82d5db487622ff74397765c1cfb8266 SHA-256: c558594449951e47d10c610b0c328a08d69f86dc964448766cab0d69987e0000

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics strongly indicates exploitation of this component. The `RTF_OBJDATA` heuristic further confirms the embedding of OLE object data. This technique is commonly used to achieve arbitrary code execution, typically for downloading and executing further malicious stages.

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_off00001916.bin` `f64586a7cbe739b07de61e4914878a491c015b44fe397a27aa6070601fe7e9f2`	rtf-objdata-decoded	RTF \objdata at offset 0x1916	1388 bytes

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