RTF malware analysis — malicious · f3c2f3594817df13

MALICIOUS

RTF

74.9 KB First seen: 2023-08-17

MD5: 5244f3ad764530194749844302784188 SHA-1: 76e4236e69cd75dfce9e4df902a0e0c8216e2d4d SHA-256: f3c2f3594817df1307afd458a0328ccff1e63683ef86a6d176ca41bda9e3a14f

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of \objupdate indicates an attempt to force OLE activation. The document body contains a lure instructing the user to 'Enable editing', which is a common tactic for macro-based malware or exploit documents.

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000034d4.bin` `9f0997998a8b91f235e8d8b809c5e1c859fe79e7cc64b344b422117b921feacc`	rtf-objdata-decoded	RTF \objdata at offset 0x34D4	1306 bytes

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