RTF malware analysis — malicious · d9e3badb259072ad

MALICIOUS

RTF

166.9 KB First seen: 2023-07-15

MD5: d8aac2e906926936cb564f477a23661c SHA-1: 73a54a91c74cab6667b0faa9dd9049a314e93a40 SHA-256: d9e3badb259072ad8fd55222b22196ee97b3e81a8cbc72bd8e75d786010a91e4

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.001 Malicious Link: Malicious Link

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of \objdata and \objupdate heuristics indicates that the document is designed to exploit this vulnerability, likely to download and execute a secondary payload. The obfuscated document body does not provide further clues, but the critical heuristic strongly suggests a known exploit vector.

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_off0000171a.bin` `2a52b951cec5156f672249af3ebc5dd56cdefe2391ca2663f957bcc6fe97513e`	rtf-objdata-decoded	RTF \objdata at offset 0x171A	48148 bytes

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