Malicious RTF — malware analysis report

Static analysis result for SHA-256 ec7001a26d275ffc…

MALICIOUS

RTF

14.3 KB First seen: 2019-05-16
MD5: 717aaeedd8e1618d37b7eaee4ce60bb1 SHA-1: 6f1ce3adf886d0717bb65dbc4dd8062036c4afac SHA-256: ec7001a26d275ffcebde6857be2f7fd00c15d5af5995bb12ca7c6d2e921533aa
220 Risk Score

Malware Insights

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

The sample is an RTF document that contains an OLE object with an Equation Editor CLSID, triggering critical heuristics for CVE-2017-11882. This indicates the file is designed to exploit this vulnerability for client-side execution. The ClamAV detection name further confirms this specific exploit. The attack pattern is consistent with a malicious attachment delivered via spearphishing, aiming to execute a payload.

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_off000014bc.bin rtf-objdata-decoded RTF \objdata at offset 0x14BC 4657 bytes
SHA-256: 176cdf48a504aaaabaa39f0eda3980a94d2536d5fc37d8840601f175809faaf7