Malicious RTF — malware analysis report

Static analysis result for SHA-256 2ed0f93d050fb19c…

MALICIOUS

RTF

9.2 KB First seen: 2018-09-04
MD5: 420d88233f6d632095acdbfc218b621a SHA-1: 7bc8ae6b7de95457fd3d5eb526432acc4dfcd199 SHA-256: 2ed0f93d050fb19cfb95c851ae18760b5c5062bc3ce7adb1a1b938c49da82589
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 allows for arbitrary code execution on the victim's machine. The ClamAV detection name further confirms the exploitation of this known vulnerability. The file is likely delivered as a spearphishing attachment.

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_off0000003d.bin rtf-objdata-decoded RTF \objdata at offset 0x3D 4668 bytes
SHA-256: 7091f45344c21e1345c8c8cda822e823425f58cfd3c39c5b5fd93325f29f1e9a