RTF malware analysis — malicious · 6b2a2387a9288b38

MALICIOUS

RTF

554.0 KB Authoring application: Riched20 6.3.9600 First seen: 2019-06-27

MD5: ca77baafe903c0b02be7549d4f98ffb9 SHA-1: c384dcc187328ef67076cd66705867256146662c SHA-256: 6b2a2387a9288b38bf9ce8d515d760e52ce9a2d13153c4e3239a8c3e3134d939

482 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability is known to be used for arbitrary code execution. The file also contains packed executable content detected by ClamAV as Win.Packed.Agen-7602352-0, indicating it likely downloads and executes a second-stage payload.

Heuristics 11

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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.
ClamAV: Win.Packed.Agen-7602352-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Packed.Agen-7602352-0
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
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
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://nsis.sf.net/NSIS_Error In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000ef.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEF	275174 bytes
SHA-256: `8ee376a8e93443b70038fd704e36682c96f5884031ef21a30004309057213d3d`
Detection ClamAV: Win.Packed.Agen-7602352-0 Obfuscation or payload: unlikely
`objdata_01_off0008670a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8670A	3980 bytes
SHA-256: `8e90e87bc0d949de2fbd388c81d0efc6c4189c659f854d3c0a380730901e8ec1`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\cris.exe &��D$,f-Q��%
`objdata_02_off00088950.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x88950	3546 bytes
SHA-256: `a3c705dbe477ef446cc253c2fb6b212424f3023fa99345c6223af413bb52cd42`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\cris.exe AC

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