Malicious RTF — malware analysis report

Static analysis result for SHA-256 353820cbdbe1800c…

MALICIOUS

RTF

13.2 KB First seen: 2018-06-30
MD5: 15ccd645941ad7d4f7a24bf5bd116611 SHA-1: 1e366ca9df128b5bc0f30231c230387fcf609908 SHA-256: 353820cbdbe1800ca5dd83ab2e530c2a976d2c9d97fd67122c80a4853b08e1c0
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 triggers heuristics related to Equation Editor exploits, specifically CVE-2017-11882. This indicates the file is designed to exploit a vulnerability in the Equation Editor component to achieve code execution. The ClamAV signature further confirms this exploit. The likely goal is to download and execute a secondary payload, a common tactic for initial compromise.

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_off00001460.bin rtf-objdata-decoded RTF \objdata at offset 0x1460 4154 bytes
SHA-256: 9ffaf4d3a4bd40fcd0b6fede94ec1c6d9f7bfa33ad281dd39cb449a89541d512