RTF malware analysis — malicious · 87c8a3eb76201feb

MALICIOUS

RTF

1.14 MB Created: 2017-04-11 15:30:00 First seen: 2019-01-25

MD5: 5f542e7b53707395214783a33a32880a SHA-1: bc9be6ce994e2ce4e660ad3b034575eb591a01d7 SHA-256: 87c8a3eb76201feb57f6ca182b6add476da7c28cdf54e86e0b83a37a742f3ba5

322 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains an OLE object that exploits CVE-2017-8759, a vulnerability in MSXML SAX OLE activation. Heuristics also indicate references to PowerShell and Windows Script Host, suggesting the execution of malicious scripts. The embedded URL, though benign, is present in the RTF body, indicating a potential phishing lure.

Heuristics 9

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.
ClamAV: Win.Phishing.Suspicious-6355521-4 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Phishing.Suspicious-6355521-4
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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 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://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00015b88.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x15B88	11410 bytes
SHA-256: `a64987896f9f8d3604272db9c77eb7be0c629f1fcd3df379ab8754203d14971e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): mshta.exe

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