RTF malware analysis — malicious · f044c02fa90549da

MALICIOUS

RTF

3.5 KB

MD5: 79f6a7543d65577041b6e60db871487e SHA-1: 79f9bfc7211f680bb2b1390e72f2700904c9c37f SHA-256: f044c02fa90549daa3544371c7e003b424db14944c4ca34d9f78170755a69809

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains critical heuristics indicating the presence of a vulnerable Equation Editor object, which is commonly exploited to achieve arbitrary code execution. The presence of OLE object data and the \objupdate command further suggest an attempt to trigger this exploit. This pattern is often used in spearphishing attachments to deliver a 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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000ab.bin` `fc0ed77a8a58b0640f491286a4f510d5552edc4c20502d68a596f67714646003`	rtf-objdata-decoded	RTF \objdata at offset 0xAB	1543 bytes

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