Malicious RTF — malware analysis report

Static analysis result for SHA-256 f2aa22ca1063d15e…

MALICIOUS

RTF

762.4 KB Created: 2019-01-13 11:12:00 First seen: 2019-04-17
MD5: 4cc45e20b34dece5a60aba743721fdc7 SHA-1: fafdd5fa2d3fa501f22b5e03373a628083c4f870 SHA-256: f2aa22ca1063d15e774b3c97b336049ede32125ea6971074c6effba52fee4225
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-6835372-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6835372-0
  • \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 12 \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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00004d77.bin rtf-objdata-decoded RTF \objdata at offset 0x4D77 22587 bytes
SHA-256: e2d574b6fa426b5cad41c556bebdde828af77e57a8fba9ffb3389769e014a36a
objdata_02_off00022f1c.bin rtf-objdata-decoded RTF \objdata at offset 0x22F1C 22587 bytes
SHA-256: 048b94ef4bf38c754c6858f68c5bb5b8ce68784f6a970400eebe0b2b160deb4a
objdata_04_off000410c1.bin rtf-objdata-decoded RTF \objdata at offset 0x410C1 22587 bytes
SHA-256: 5fb037dc8c144e42213300cc71ff2835464e562ea086bbdd9f6ada05159ac085
objdata_06_off0005f266.bin rtf-objdata-decoded RTF \objdata at offset 0x5F266 22587 bytes
SHA-256: 5224b80c50793978594a8c29e641ff06cc54b07aa0c6d4de13de1532a449be37
Detection
ClamAV: Doc.Dropper.Agent-6835372-0
Obfuscation or payload: unlikely
objdata_08_off0007d40b.bin rtf-objdata-decoded RTF \objdata at offset 0x7D40B 22587 bytes
SHA-256: 5f44e51e0ecffc81d9f1ee0af263960dd92ef72c4375eb798182dc05dca59b8e
Detection
ClamAV: Doc.Dropper.Agent-6836926-0
Obfuscation or payload: unlikely
objdata_10_off0009b5b0.bin rtf-objdata-decoded RTF \objdata at offset 0x9B5B0 22587 bytes
SHA-256: 6456ca3e65c629dffb0ddc8e2a51e9b0a147ff76da6144a0882f48ad5ee36839
Detection
ClamAV: Doc.Dropper.Agent-6836966-0
Obfuscation or payload: unlikely

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