RTF malware analysis — malicious · 1f4b80eb87c8a369

MALICIOUS

RTF

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

MD5: 8883343689aa57601a6776b3e4ad56de SHA-1: 24252ccc4ff74394ba96b96e534e47d44a366605 SHA-256: 1f4b80eb87c8a3690e7a684ba1cfff145a7fd3530552adc7b6e8c3c5d3f915d5

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	3824 bytes
SHA-256: `8f79a246e2d14f794be7641bda6addf3d5da40c4959ba011228bf76508e1448b`
`objdata_01_off00001f1e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1F1E	3980 bytes
SHA-256: `4b75a16c2e5932b8bbffa355829891e3a0780bdb9d1ba630f1593182b9f0ac06`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\osasbro.exe &��D$,f-Q��%
`objdata_02_off00004164.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4164	3546 bytes
SHA-256: `4ddfb0567f8e30a12d05f9deac50b3903209b5311b98f78c9f0eb4398edad32d`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\osasbro.exe AC

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