RTF / .DOC malware analysis — malicious · 153d9bd77c2f43f9

MALICIOUS

RTF / .DOC

47.9 KB First seen: 2023-09-11

MD5: 9fd3a5b1277977f44b798739075c4959 SHA-1: 7441e3cb1ca6a191ae55182dc5f74d2596f3b75c SHA-256: 153d9bd77c2f43f9092654c7f61b914f204889a6a78a628f44a5cbd65af3e4a2

180 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an RTF document that leverages OLE object data and specifically targets the Equation Editor vulnerability. The document body contains a lure to 'Enable editing' to bypass security measures. The presence of RTF_OBJDATA, RTF_OBJAUTLINK, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly indicates the exploitation of OLE objects, likely to download and execute a secondary payload.

Heuristics 5

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00003b83.bin` `cdfb52b36218c66fe68c2a059c1894b22d44d4b3b0fca344f788faa3a41ad71b`	rtf-objdata-decoded	RTF \objdata at offset 0x3B83	1419 bytes

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