RTF malware analysis — malicious · 1785a0fe2a6d1760

MALICIOUS

RTF

82.5 KB First seen: 2024-08-21

MD5: ed3c59a3e67a8803a62bb3ca27c9ad31 SHA-1: 08cbf58c031edfba2164838d2bd75a931fc8fb3a SHA-256: 1785a0fe2a6d1760e4ac22c6eae7eda96328ea1544ce6c32dd05fb56d86729ab

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-1997-2526). The ".objupdate" directive forces the activation of this object, which is a known method for exploiting this vulnerability to achieve arbitrary code execution. This technique is commonly used to download and execute a second-stage payload, hence the high confidence in this attack pattern.

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_off00001d81.bin` `a563f38d569d00be0914b4b3c41b2a598274f229a7be31780441a7d3d1962d0c`	rtf-objdata-decoded	RTF \objdata at offset 0x1D81	1694 bytes

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