Malicious RTF — malware analysis report

Static analysis result for SHA-256 609758ca810cd570…

MALICIOUS

RTF

9.1 KB First seen: 2019-01-11
MD5: 2e31dec512c9e903490b7d3c2d0f2c16 SHA-1: ddefff210ad979b3a65697904e29affc5cf99f0e SHA-256: 609758ca810cd5700e3eb4335168b8086acfe3b89277ecbf50cf9d6787adedea
220 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and specifically triggers heuristics related to the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to allow for arbitrary code execution when the document is opened. The ClamAV detection name confirms this specific exploit. The file is likely delivered as a spearphishing attachment to lure victims into opening it.

Heuristics 5

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4648 bytes
SHA-256: 583a96afbb1e31c8bb7f5807d8d0c58daa9659a64b4d91b75da8459a5960893e

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