RTF malware analysis — malicious · b0e6efc3b70688bd

MALICIOUS

RTF

11.8 KB First seen: 2023-02-23

MD5: ac64f6ed06ca35a575827d0dae1552f8 SHA-1: c2f413cdf8ca94073f1a3aeee2eaa0a6fbf66f1c SHA-256: b0e6efc3b70688bd0240fa6b0406abc6a308f12bf365af35d1c7845676239ffd

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics strongly indicates exploitation of a known vulnerability for code execution. The `RTF_OBJDATA` heuristic confirms the presence of embedded object data, which is the typical mechanism for delivering the exploit payload. The exact payload or download URL is not directly visible in the provided evidence, leading to an 'unknown family' classification.

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_off00001249.bin` `90777c0c82818f5b35a5c62f54196b3d5815eb69163a4a595edcd361a32bcc3d`	rtf-objdata-decoded	RTF \objdata at offset 0x1249	1556 bytes

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