Malicious RTF — malware analysis report

Static analysis result for SHA-256 f84a0e490931df7d…

MALICIOUS

RTF

8.1 KB First seen: 2018-10-07
MD5: 1293ee7f785f94908af4aa5a50e0b416 SHA-1: 3c931d1b5fe7747540ad4f9eeedf2337297d39a6 SHA-256: f84a0e490931df7d00c78c3ac9c9831fc9e6842e068f2de4ed7466e33c28f7c8
180 Risk Score

Malware Insights

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

The file is an RTF document containing an embedded OLE object, specifically identified as an exploit for CVE-2017-11882 targeting Microsoft Equation Editor. This exploit allows for arbitrary code execution upon opening the document. The presence of the Equation Editor CLSID and the ".objupdate" directive strongly indicate this malicious intent. The ClamAV signature further confirms the exploitation of CVE-2017-11882.

Heuristics 4

  • 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
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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 4138 bytes
SHA-256: 1b0c83faca933543fc29c3f6e8738c4d742241f0a72c44f8cce23c8fc814eb6a

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