RTF malware analysis — malicious · 0085f002dd1f6102

MALICIOUS

RTF

89.6 KB First seen: 2024-06-25

MD5: 71203646e017d3b63faf4e9d19c11dc4 SHA-1: 26f8ac97c28017c914591d6c3c3e543bee0c5462 SHA-256: 0085f002dd1f610211a5e5ee02d55b593e269b22b68c27874015fa59a6299cf0

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.003 Windows Command Shell

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of CVE-2017-11882. The \objupdate directive forces OLE activation, which is likely intended to trigger the exploit. This exploit typically downloads and executes a second-stage payload, hence the attack pattern of exploitation for client execution.

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_off00001a15.bin` `45ac174292cec2c7cc866bd6df39d2d8042ca5d0e69fbd46f803650f7b820ef1`	rtf-objdata-decoded	RTF \objdata at offset 0x1A15	2170 bytes

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