Malicious RTF — malware analysis report

Static analysis result for SHA-256 db83aef9c16d50f1…

MALICIOUS

RTF

841.4 KB Created: 2018-03-12 23:04:00 First seen: 2018-06-25
MD5: 359bcb291f5b3091d9ddcedad3968d13 SHA-1: 997718b5b73cb49a06219ebfc09c331ccc3cd38b SHA-256: db83aef9c16d50f19261974e121f090195b33e4f40e110043c70540be98d1cbb
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_off00002c51.bin rtf-objdata-decoded RTF \objdata at offset 0x2C51 28731 bytes
SHA-256: 314cc12d81e846507ecf39857e279672bfed2ee8353eb725ecefa5187a02b5f6
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00016c98.bin rtf-objdata-decoded RTF \objdata at offset 0x16C98 28731 bytes
SHA-256: 194fdcd863df82e186d264a0b12c49437c9df10da125ecbe386d751f879b3845
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_03_off0003ed26.bin rtf-objdata-decoded RTF \objdata at offset 0x3ED26 28731 bytes
SHA-256: 9be7b16e2ec7f725790a241d9aaed9fc16cb5d5be2a99ce25fd7eb431f75bcb1
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00066db4.bin rtf-objdata-decoded RTF \objdata at offset 0x66DB4 28731 bytes
SHA-256: 658b0159f3d930aec1fe894a6378dbc466f7afc9d103cbbf9ebcdda9217085fe
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008ee42.bin rtf-objdata-decoded RTF \objdata at offset 0x8EE42 28731 bytes
SHA-256: 9a267c0df7192fbe1094bd0ebffc4f0a897a7350db0522c803f304cd60f9a796
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_09_off000b6ed0.bin rtf-objdata-decoded RTF \objdata at offset 0xB6ED0 28731 bytes
SHA-256: ea96a274aae7ef0f9396f55d0978ef44411d4791f8f69c907f1df0e3fe208fea
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.