Malicious RTF — malware analysis report

Static analysis result for SHA-256 f6b237a599a54458…

MALICIOUS

RTF

737.1 KB Created: 2018-04-27 02:05:00 First seen: 2018-06-30
MD5: 768539bbe2c156d231a0d285c859c706 SHA-1: 03220f5a922fef9f585bf60c62be5c0c5fc45ae3 SHA-256: f6b237a599a5445854c21de44dcc3dbe0eca60220262285bd799973ae5f70528
262 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute a secondary 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.
  • ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • \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 10 \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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c14.bin rtf-objdata-decoded RTF \objdata at offset 0x2C14 24123 bytes
SHA-256: 9fd00215c6d1895d8aa1db3e3239ea7d358904a0f094450a023fa50af642a0c0
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off0001429a.bin rtf-objdata-decoded RTF \objdata at offset 0x1429A 24123 bytes
SHA-256: 0dcaf28bc543b5cae2fcbe918e1d015e4a2e103438424b08e5292bd927054156
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0004862c.bin rtf-objdata-decoded RTF \objdata at offset 0x4862C 24123 bytes
SHA-256: b8cdbef1d30173b452d8e2835b0c579a127dd97e84a956f292a259fc4bf31cc9
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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