RTF malware analysis — malicious · 2b066d894868d6d1

MALICIOUS

RTF

72.9 KB First seen: 2024-07-23

MD5: a06fd78c2be2c0527d1835dc4f41760a SHA-1: 94699edecabb9906f1ef61b5ae39de8dd8075ed7 SHA-256: 2b066d894868d6d1e50617e71ba3c687d3b273ff034e2cd74892f6103960462f

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing OLE object data and specifically targets the Equation Editor vulnerability. The presence of \objdata and \objupdate heuristics indicates an attempt to embed and activate an OLE object, which is a common technique for exploiting vulnerabilities like the Equation Editor flaw. This exploit likely serves to download and execute a secondary 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_off000012a2.bin` `abb2fe8032bee81f2a3a4cbb4401b1034b8e9d705ca7f095b68b159fb6810286`	rtf-objdata-decoded	RTF \objdata at offset 0x12A2	1568 bytes

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