RTF malware analysis — malicious · 5ac99eae1547a0fb

MALICIOUS

RTF

12.8 KB First seen: 2022-10-29

MD5: 8404d43217aa07976f923f384e6c2305 SHA-1: 07146b6ffac6ab4cedc4a15504e073ad8b556f9f SHA-256: 5ac99eae1547a0fb06d8ae2972a78ef3e913b552a28c1dcc4c84161a3824ed40

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document containing OLE object data, specifically triggering critical heuristics for Equation Editor exploitation and OLE object activation. This indicates the file is designed to exploit a vulnerability, likely CVE-2017-11882, to achieve code execution. The embedded OLE object, decoded as 'objdata_00_off00001640.bin', is the primary artifact facilitating this exploit, suggesting it contains the malicious payload or a loader for it.

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_off00001640.bin` `d4dd0ac6f2a4123477378337752e1e4cb57e3b9c2a62bd4b3089634cffdad915`	rtf-objdata-decoded	RTF \objdata at offset 0x1640	1748 bytes

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