RTF malware analysis — malicious · b55921f14da9fb9b

MALICIOUS

RTF

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

MD5: eb4038faad9044fef355da941bae3183 SHA-1: a0a0d62823161e6a1c9c62e5c5a7fe068363b83c SHA-256: b55921f14da9fb9b0d9b4a4b9797459ec1eabefc7062c7112845521252577a9e

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	3797 bytes
SHA-256: `227a21b7473452f3a78790b788ddcd8c43c354d6578dddd4b027d8af78456f2a`
`objdata_01_off00001ee8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1EE8	3980 bytes
SHA-256: `b91c711f90d86f6fbafb57f096d538a4ce217406f2c9d510cd684ccece3b35fe`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\osas.exe &��D$,f-Q��%
`objdata_02_off0000412e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x412E	3546 bytes
SHA-256: `7d0e2f0ef7f3b93f9e4ae1ccc269ee862eb6e74dbd3650bdb8996fd9fcab4c9a`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\osas.exe AC

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