RTF malware analysis — malicious · f3d83f8392eaf1a5

MALICIOUS

RTF

370.6 KB Created: 2021-09-10 16:12:00 First seen: 2021-10-14

MD5: d92e4eb6e88e5ea2e5533c7f342513d6 SHA-1: 8250e6b83efd8d782d5bea5bf63cc2c09522ce0d SHA-256: f3d83f8392eaf1a551f899ed390810b3664fe3c2fb3a0420856d3429fe64db16

422 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects and triggers critical heuristics for CVE-2017-11882 (Equation Editor font record overflow) and CVE-2017-8759 (MSXML SAX OLE activation). These vulnerabilities are commonly exploited to execute arbitrary code. The presence of a PE header in hex data further indicates a malicious executable payload. The document body content appears to be a list of research topics related to green growth and environmental technology, likely a lure.

Heuristics 10

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.
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
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
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
\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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
OLE object data medium RTF_OBJDATA

RTF contains 2 \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://schemas.micro In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000186f0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x186F0	135402 bytes
SHA-256: `5eda582369843f39739a140ee2d9609d0a067bbd6b9488b60cc845462320fffa`
`objdata_01_off0005abee.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5ABEE	3546 bytes
SHA-256: `779bb6a1471b4d72c1c6ced5c694c90ab7c774aeb456cc17604065d28839a0e6`

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