RTF malware analysis — malicious · 4afa8bac7b32fe85

MALICIOUS

RTF

578.5 KB Created: 2019-01-07 23:54:00 First seen: 2019-10-29

MD5: 8d76aa42eb743f05ec11e2c77def8c07 SHA-1: 1a532ced2ca7177d231dafa15c7ff158c00ac07a SHA-256: 4afa8bac7b32fe85c01e8e76ff9b8eb11ad42cd0f85f8a8ec9bafbee08db078b

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains multiple OLE objects and uses \objupdate to force their activation. A critical heuristic identified CVE-2017-8759, indicating exploitation of MSXML SAX OLE activation. This suggests the document is designed to execute arbitrary code via the embedded object, likely downloading a second-stage payload.

Heuristics 6

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.
\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.
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 5 \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_off00002480.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2480	55342 bytes
SHA-256: `23237f6410dd0275c97113c9ce2774e04f137d9d47d98217d9397ba8a48d85c3`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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