RTF malware analysis — malicious · b91b189e8ade463e

MALICIOUS

RTF

22.9 KB Authoring application: Riched20 6.3.9600 First seen: 2018-03-04

MD5: 3d697aa975c9aad629f349415f1d52f8 SHA-1: 0dade62f830935db20a37e5e8cff4b9917c7bf24 SHA-256: b91b189e8ade463ee918cce0150a957d5f24965a72a5696edeb8af6704f6e77c

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: 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.
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	3276 bytes
SHA-256: `4aea451ba9168e2c9d862b6f19ab8cae541eddd8284ea0673d2dbfe447c6fcdf`
`objdata_01_off00001ad6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1AD6	3980 bytes
SHA-256: `78520455b1bc503317819bba33da5d17cad99f7ab2b53f8d977d185fb859f803`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\put.exe &��D$,f-Q��%
`objdata_02_off00003d1c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3D1C	3546 bytes
SHA-256: `6fae5f0795333efc630294722a6333ec0dab388558ba36380d0aa014e00d985f`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\put.exe AC

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