RTF malware analysis — malicious · a237c08add2ea846

MALICIOUS

RTF

97.7 KB First seen: 2024-09-22

MD5: 2db98a27e71fef64135ce5e259d5a8c4 SHA-1: c56c7928e5be5938ca7d958ebb03d3544b05ecdb SHA-256: a237c08add2ea84614fdf51181abd922b15e53b01673b06509578f4e3ba301bd

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The ".\objupdate" directive forces the activation of this object, leading to the execution of malicious code. This is a common technique for delivering secondary payloads, although no specific payload or download URL was directly extracted from this sample.

Heuristics 4

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001a94.bin` `c8f592cfac48448b33570bca52820dbe5c2c1991ba02518aeca3ee96950ed321`	rtf-objdata-decoded	RTF \objdata at offset 0x1A94	1750 bytes

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