RTF malware analysis — malicious · 7cee2955d8fee68f

MALICIOUS

RTF

14.9 KB First seen: 2023-02-28

MD5: a0d3000e5792081fa970184fe592808f SHA-1: 551941fd7e55cb98ea3a2f315fabe1d2b0a0b935 SHA-256: 7cee2955d8fee68f5501d86c84159f3e8cefcd52476a950a5712b84bbb1feedd

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The ".objupdate" heuristic indicates that the embedded object is designed to be activated automatically, leading to 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_off00001dc4.bin` `34311495c17ee49bfe135d405c77d7e9a266b22896a1642d05b2aab185dce97b`	rtf-objdata-decoded	RTF \objdata at offset 0x1DC4	1630 bytes

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