RTF malware analysis — malicious · 7f53ec50272d4511

MALICIOUS

RTF

45.6 KB First seen: 2023-07-25

MD5: 519b94d3f11103f279b8b13ce1d5b4bf SHA-1: 7425646dac7406b278830c76e33feebb21d6e55a SHA-256: 7f53ec50272d45111e4d1532bf879c4ea093fed94e5b8d3fa9b079e48349286e

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter T1566 Phishing

The RTF document contains an embedded OLE object that exploits a known vulnerability in Microsoft Equation Editor. The presence of ` tf_objupdate` and `SE_ENABLE_LURE` heuristics indicates that the document is designed to trick the user into activating the embedded object, which then likely executes a malicious payload. The document body itself is a lure, instructing the user to 'Enable editing' to view the content, which is a common tactic for macro-based or exploit-laden documents.

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.
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off000044ac.bin` `5054363e0dd3e70df44fc2179217301980b50d900aa2185bca29416b54beca7d`	rtf-objdata-decoded	RTF \objdata at offset 0x44AC	2048 bytes

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