Malicious RTF — malware analysis report

Static analysis result for SHA-256 721f08f599cae7b1…

MALICIOUS

RTF

902.6 KB First seen: 2019-06-27
MD5: 2ccc650bcc1d27655e524edc12eba212 SHA-1: 68f5959af522b4f381f1151cd1b66dbad6920225 SHA-256: 721f08f599cae7b1648a7fc7c3ca79bb4c3db2558ed8c0ebb8ed32045e673506
140 Risk Score

Malware Insights

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

The file is an RTF document that contains an embedded OLE object, which is triggered by \objupdate. ClamAV detection confirms this is a known exploit for CVE-2017-11882, a vulnerability in the Equation Editor. This exploit is typically delivered via spearphishing attachments.

Heuristics 4

  • 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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000af6.bin rtf-objdata-decoded RTF \objdata at offset 0xAF6 3623 bytes
SHA-256: 3ae98506540df27d6ef4bdb445f7f296669ebda8a256cc9ead39a0c25084b59d

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