RTF malware analysis — malicious · 32c600a3406f52ef

MALICIOUS

RTF

15.9 KB First seen: 2023-02-08

MD5: bf9d5514112336ab60094ad3098bbc25 SHA-1: aac0e12682cb89025ca8d458716b1113386e34e8 SHA-256: 32c600a3406f52efc6a9abbc5498adbef9feabff7cd3f4a7cc43c01abd748bfc

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains OLE object data and specifically targets the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" directive forces OLE activation, indicating an attempt to execute embedded content. The decoded OLE object data is likely the initial stage of a multi-stage attack, potentially downloading further payloads.

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_off00001e44.bin` `1c921547772bec2cf91763f9f45aadf35d16c73c5ea418c04d857d01dd753e87`	rtf-objdata-decoded	RTF \objdata at offset 0x1E44	1996 bytes

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