Malicious RTF — malware analysis report

Static analysis result for SHA-256 8e18f9ff5579cec4…

MALICIOUS

RTF

8.2 KB First seen: 2018-08-26
MD5: 3ed8a03bdbfaee911322274528ff8036 SHA-1: 36bb1c6f8b4c20f6d8bdab00a99d9d296df10043 SHA-256: 8e18f9ff5579cec40832f7912a77e7eab21452aa5cc74b455943bfeece9527be
220 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is activated, typically through user interaction or an \objupdate directive. The ClamAV detection explicitly names this exploit, indicating a high likelihood of malicious intent.

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_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4156 bytes
SHA-256: 412db7ec5c14409244575056ec46d7eace0735fa5c726b28e63c9b1f85b17eb3

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