RTF malware analysis — malicious · 545d40ade3522c1e

MALICIOUS

RTF

74.6 KB First seen: 2023-08-09

MD5: 76423e939823bb7a5ebccb95e446dad1 SHA-1: 1263e912a2bd08017a66a27bc057372499c4bfac SHA-256: 545d40ade3522c1e3e361746d2575d0713ceb992658cb30cbca4d0cdc824e6e9

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The file is an RTF document that exploits a vulnerability in Equation Editor, as indicated by the RTF_EQUATION_EDITOR heuristic. It also contains an OLE object and uses an objupdate directive to force activation, suggesting it aims to execute embedded code. The document body provides a lure related to financial audits, instructing the user to 'Enable editing' to bypass security measures.

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_off00003d1f.bin` `626e60e6b5c544e0cfaa9fdf0aa88e3cf0c4424c8541eb7a17d4d0f904c089eb`	rtf-objdata-decoded	RTF \objdata at offset 0x3D1F	1675 bytes

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