RTF malware analysis — malicious · 5e83e78d0fe81ef4

MALICIOUS

RTF

10.7 KB First seen: 2023-03-12

MD5: 68e4e02abb6cfe1a980aa3a97bcad4f8 SHA-1: 15885c44c852a92ccb8beb656e6f9e788794f833 SHA-256: 5e83e78d0fe81ef4fdeb85e1a97ee390aa9259349ba37abb7e32648ee2246404

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

The file is an RTF document that contains an embedded OLE object, specifically targeting a vulnerability in the Equation Editor. The presence of \objdata and \objupdate heuristics strongly suggests that the document is designed to exploit this vulnerability upon opening, leading to arbitrary code execution. This is a common technique for delivering secondary payloads, though no specific payload or download URL was directly 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_off00000b44.bin` `aeac15be34ab72c8e7923283eec3d11f089ad90d4e4d2efba5117a3861e75200`	rtf-objdata-decoded	RTF \objdata at offset 0xB44	1592 bytes

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