RTF malware analysis — malicious · 1db298fa4451d466

MALICIOUS

RTF

15.0 KB First seen: 2023-02-15

MD5: 6cf376d32463ed07cf0fcb9106dd5776 SHA-1: 199e455f8ab86149b55190613101e933402ad2ae SHA-256: 1db298fa4451d46661b5fb38bcddb7aa74415dd237d6e667fc0e51d780da80cd

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains OLE object data and specifically triggers heuristics for the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" heuristic indicates that the embedded OLE object is forced to activate, which is a common technique for exploiting this vulnerability. This likely leads to the execution of a secondary payload, although no specific script or URL was extracted from this sample.

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_off00001833.bin` `543a8d0997a0f242a1ebf91865eed0e082f43c83b965a0af76a4b613d0f933e2`	rtf-objdata-decoded	RTF \objdata at offset 0x1833	1955 bytes

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