RTF malware analysis — malicious · aca1871a164d587b

MALICIOUS

RTF

66.3 KB Authoring application: riched20 6.3.9600 First seen: 2024-12-07

MD5: 67bb3235560b2fc8f612dd0c856768a7 SHA-1: e96990df5d5af63517d1178ffd606c4f0cda18aa SHA-256: aca1871a164d587b0dc8b05cc15ebdcbfd94b981ff7891615967a1409115544a

382 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.002 Component Object Model Hijacking

The RTF document contains an embedded OLE object that exploits CVE-2017-11882 through a font record overflow in the Equation Editor. This exploit is designed to execute a secondary payload, identified as a PE header in hex data, which is likely the 'bankcopy.exe' executable hosted at the provided URL. The ClamAV detection further confirms the malicious nature of the exploit.

Heuristics 9

CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://244-3-drvu.4everland.app/bankcopy.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000fe.bin` `2c3135a87f81f8607f4ccbe80274dcea662ae78493fc2c203957b59b8c84da7e`	rtf-objdata-decoded	RTF \objdata at offset 0xFE	33458 bytes

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