Malicious RTF — malware analysis report

Static analysis result for SHA-256 f91b8c6f132c37ac…

MALICIOUS

RTF

8.2 KB First seen: 2019-01-12
MD5: bc5854cc59431511d6200b798eda84d5 SHA-1: 92b1d277726d9e8e339afff39ac732c98d58d7ce SHA-256: f91b8c6f132c37ac2651b4cf651d65410661ca4ec29df23b5004ec264d9d8f56
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document containing an embedded OLE object that triggers an exploit in Microsoft Equation Editor. This is consistent with the CVE-2017-11882 vulnerability, which allows for arbitrary code execution. The ClamAV detection name directly indicates this exploit.

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_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4155 bytes
SHA-256: 8900d645f85670427fdeddd729c43349ca52c438831a68c8902f30690551e253

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