RTF malware analysis — malicious · 99e19fe2f5535480

MALICIOUS

RTF

3.2 KB

MD5: 049c38f374786a1e75674c5ef17a83fb SHA-1: e5130296ffa9200d95173011e0a944af35933205 SHA-256: 99e19fe2f55354806f1b4d5facb6c40fa4d9b280d0d740f88d0adc4ec125dda2

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability. This indicates the file is designed to exploit a known vulnerability in Microsoft's Equation Editor to achieve code execution upon opening. The presence of ".objupdate" further suggests an attempt to force the activation of the embedded OLE object, likely to trigger the exploit.

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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000e6.bin` `95b3e93bf706b2581e4445c514f18d6772ba3f68283d78e9c4556d8c6f91354d`	rtf-objdata-decoded	RTF \objdata at offset 0xE6	1370 bytes

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