Malicious RTF — malware analysis report

Static analysis result for SHA-256 4f5d4971b185d6e4…

MALICIOUS

RTF

15.6 KB First seen: 2018-07-27
MD5: 98dd01beb40b279dc541898f04b5a601 SHA-1: 98116b930724dde5a3079b467ad16ad62f6123ca SHA-256: 4f5d4971b185d6e428494319492627dd1f84dc9116aead6ed12e6bada141bc69
220 Risk Score

Malware Insights

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

The file is an RTF document containing embedded OLE object data, specifically triggering heuristics related to Equation Editor vulnerabilities (CVE-2017-11882). The presence of ` tf_objupdate` and `rtf_ole10native_stream` further indicates an attempt to activate embedded content. ClamAV detection confirms this as a known exploit targeting Equation Editor, commonly used to deliver secondary payloads.

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_off00001a11.bin rtf-objdata-decoded RTF \objdata at offset 0x1A11 4664 bytes
SHA-256: 4b2be915ea4d76bc424668b86d80feecd7f7af964756ea35eff0221936796571

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