Malicious RTF — malware analysis report

Static analysis result for SHA-256 f7de2cdbbcda0f35…

MALICIOUS

RTF

808.2 KB Created: 2018-03-12 22:02:00 First seen: 2018-06-21
MD5: f379111ed445ade7157ade15976e76b8 SHA-1: 8332caaad5b4cfb9a3e576aa0d494a40de24860c SHA-256: f7de2cdbbcda0f35e2cdff43da93301e33f1a655a4efc9a3b6e560bba8701340
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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c4b.bin rtf-objdata-decoded RTF \objdata at offset 0x2C4B 27195 bytes
SHA-256: edeefd02a4f0e4520ef3b3a462ea2a8383b41a317433a6d42be9d0551ef7b917
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00015f45.bin rtf-objdata-decoded RTF \objdata at offset 0x15F45 27195 bytes
SHA-256: bf3092daf3b480a90eda2697f93daed3427dae06dbff65b77110c1f23aae0034
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_02_off0002923f.bin rtf-objdata-decoded RTF \objdata at offset 0x2923F 27195 bytes
SHA-256: 1bdc07d2a7400ad9b40d720e8daa8fbba9e3c4261c2e5a9bf8c01ce37288ffa4
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_03_off0003c539.bin rtf-objdata-decoded RTF \objdata at offset 0x3C539 27195 bytes
SHA-256: 3185c105c3593f61084a672960337d3bbfc9177d2473a99b73bf984b02e75116
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_04_off0004f833.bin rtf-objdata-decoded RTF \objdata at offset 0x4F833 27195 bytes
SHA-256: 69c6eb58aa6d22044a1d8a6df85eee1256bbe4e1bd029e01e4909c91dc55c192
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00062b79.bin rtf-objdata-decoded RTF \objdata at offset 0x62B79 27195 bytes
SHA-256: 428b8ec4140d9631aa0c850770db578e2aba396354fecf4e212e0ca375b04420
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_06_off00075e73.bin rtf-objdata-decoded RTF \objdata at offset 0x75E73 27195 bytes
SHA-256: b43b2eca6d3ac87b8bf4111e16d8fe15204b2a13d9e801ab4f6204a7c2f62901
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008916d.bin rtf-objdata-decoded RTF \objdata at offset 0x8916D 27195 bytes
SHA-256: a161f3211707d184bc38e5c4a1f4f34651cf2beffd264a0a43cd3dfc45226b94
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_08_off0009c467.bin rtf-objdata-decoded RTF \objdata at offset 0x9C467 27195 bytes
SHA-256: d8a8474dac0cb4e45dca5d3c26c7afd1d6fa50eb9bdf5fc77e7564f513a7974b
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_09_off000af761.bin rtf-objdata-decoded RTF \objdata at offset 0xAF761 27195 bytes
SHA-256: babc77a87a632e68e408f5b96e2f6e12dab0a63e14d5ed522e0c9855c57c9a21
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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