Malicious RTF — malware analysis report

Static analysis result for SHA-256 56fe4911b023e349…

MALICIOUS

RTF

841.4 KB Created: 2018-03-12 22:25:00 First seen: 2018-06-21
MD5: 093fd7bfe7c1d3af0ea7eface7775ea6 SHA-1: cbcd5a7e3c8dc8b28cb019ce682e32b31e025e69 SHA-256: 56fe4911b023e34915ee06701dbfd145d342921a244f6bcd964128623aa41c34
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: Xls.Downloader.Generic-6750544-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6750544-0
  • \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 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c4d.bin rtf-objdata-decoded RTF \objdata at offset 0x2C4D 28731 bytes
SHA-256: 2a5f57469d367a98e40e4a8cfb47546572ac7859205351ace676024da330af5f
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00016c8e.bin rtf-objdata-decoded RTF \objdata at offset 0x16C8E 28731 bytes
SHA-256: 8076e11f29171ab44a2273f4df9b9dffe7ebfc7b778f00fee05a0ae4391e509e
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_03_off0003ed10.bin rtf-objdata-decoded RTF \objdata at offset 0x3ED10 28731 bytes
SHA-256: f94ca6be7af0179d8b52cdaea82f735fd6daa2146afd03b44f5b0359f8756506
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00066ddc.bin rtf-objdata-decoded RTF \objdata at offset 0x66DDC 28731 bytes
SHA-256: 27e2ec9782c56f529f668dfa1b89e779972706abbc2a136ba2d4180a757727dc
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008ee5e.bin rtf-objdata-decoded RTF \objdata at offset 0x8EE5E 28731 bytes
SHA-256: 2d1b6907f24a09262ed3ef48785e450e1ed70b61223352ae60bdd5ff6f3b89c9
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_08_off000a2e9f.bin rtf-objdata-decoded RTF \objdata at offset 0xA2E9F 28731 bytes
SHA-256: 6db17a675616147a40e44945fa5a34b22f362253efb6de945e1ad06c0506288a
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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