Malicious RTF — malware analysis report

Static analysis result for SHA-256 41e131e391100806…

MALICIOUS

RTF

841.3 KB Created: 2018-03-12 22:30:00 First seen: 2018-06-21
MD5: c52b1e7abac487cb3d7c32abafc0e2a6 SHA-1: 14493cfde3ec96697805e85eccf75a0f581b988d SHA-256: 41e131e391100806bdd496ccdc11afdae94ef513bbda9d08fe072f79ed3af352
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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c46.bin rtf-objdata-decoded RTF \objdata at offset 0x2C46 28731 bytes
SHA-256: 604d0d4370d49dcf1c581032625f1a92606e597b4a199b8a67e167451c32831b
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00016c81.bin rtf-objdata-decoded RTF \objdata at offset 0x16C81 28731 bytes
SHA-256: c81e982b7209e36a56542d54563395bc2780c312128b80f6e535afc74dd90ec9
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_02_off0002acbc.bin rtf-objdata-decoded RTF \objdata at offset 0x2ACBC 28731 bytes
SHA-256: 23fc47435d892fb39f7309149adaafdb53e7d83064d0075a07255753c3581f82
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_03_off0003ecf7.bin rtf-objdata-decoded RTF \objdata at offset 0x3ECF7 28731 bytes
SHA-256: 401760207bb7c306f51bdd86be41653a682edca3e38147559f0c4d37fcc51f80
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_04_off00052d32.bin rtf-objdata-decoded RTF \objdata at offset 0x52D32 28731 bytes
SHA-256: a22a5cf73f9963e9613c649f9719897f99531bc711581e52400dc3f5f9be89d1
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00066db5.bin rtf-objdata-decoded RTF \objdata at offset 0x66DB5 28731 bytes
SHA-256: 8cf0fae7bd3f8e373b35baf113628d6d48ebdbcde762dfd6ff963a04c6003fcb
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008ee2b.bin rtf-objdata-decoded RTF \objdata at offset 0x8EE2B 28731 bytes
SHA-256: 2d1ebbc8c069599c6aca92640f7b3ff7e43bb44f5d424dfa6de2003e5d55e108
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_09_off000b6ea1.bin rtf-objdata-decoded RTF \objdata at offset 0xB6EA1 28731 bytes
SHA-256: 39d564e884d8a538f65abafcc8a785693f7508039448f164ec7e93fcbaca2537
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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