Malicious RTF — malware analysis report

Static analysis result for SHA-256 d90c76a92b3309cc…

MALICIOUS

RTF

9.2 KB First seen: 2019-01-12
MD5: cf03eea47b0c669706470546fad96f39 SHA-1: dd12fb7e06ef651e5d5ca22d832c7fe588ca0259 SHA-256: d90c76a92b3309cc35c4453a2bbd5ecb8477523bdd66ac80cd409d7eca9b3533
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 further confirms the presence of 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_off0000003b.bin rtf-objdata-decoded RTF \objdata at offset 0x3B 4654 bytes
SHA-256: 263807a9c484a17b22022703d912811c49bddc434e683013db73b3744cf37b65

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