RTF malware analysis — malicious · a48e87e4ebce9cd4

MALICIOUS

RTF

11.3 KB First seen: 2023-02-22

MD5: 603aae86513d024cc1bc2729cecedfa8 SHA-1: 13d8b3a185a0ab343d5961fd1f93939fea23817d SHA-256: a48e87e4ebce9cd4deb5287e3e4cb233eaa41c66c0cd33aa7b86ff247dd2155a

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF document contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of CVE-2017-11882. The \objupdate directive forces the activation of this object, leading to arbitrary code execution. While no specific payload was directly extracted, the presence of this exploit strongly suggests the document's purpose is to download and execute a secondary 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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000137e.bin` `da527ad8abf0cdc77691cd927570e13022e2f091cb8daceef8b18e42cc5de284`	rtf-objdata-decoded	RTF \objdata at offset 0x137E	1364 bytes

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