Malicious RTF — malware analysis report

Static analysis result for SHA-256 4f6781e4a3f6df50…

MALICIOUS

RTF

9.2 KB First seen: 2018-07-14
MD5: 79f2659ad1db27c8b07cc4346f01cc81 SHA-1: a2c60a16d11e25d18c6d61a00ba9401954a139b9 SHA-256: 4f6781e4a3f6df5069907fdf638f492d73b3cd2b544bcb4313e3ac0f27f6b17e
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, specifically triggering heuristics related to Equation Editor and OLE activation. ClamAV identifies this as Rtf.Exploit.CVE_2017_11882-6584355-1, indicating exploitation of the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the embedded object is activated, likely delivered via spearphishing.

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 4667 bytes
SHA-256: 7ae31a8a808ce7c3ba7e3fd8c360474f624f98d7fbc18b37c4db3031c90dc750

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