Malicious RTF — malware analysis report

Static analysis result for SHA-256 223853e96ba02930…

MALICIOUS

RTF

10.0 KB First seen: 2019-06-27
MD5: 2ff3602bc6496a18779d62c1ff793447 SHA-1: 37627782235d7dde2250beacca05d97a06455b58 SHA-256: 223853e96ba029309ea8e247efeca0b0a1456755291de63e7337b4341adb5c82
182 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 exploits a known vulnerability in the Equation Editor (CVE-2017-11882). This exploit is designed to execute arbitrary code upon opening the document, likely as part of a spearphishing attack. The embedded URL is suspicious and warrants investigation.

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
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://�(igH.f�y In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000005e8.bin rtf-objdata-decoded RTF \objdata at offset 0x5E8 3626 bytes
SHA-256: d6ce8cc937ab86565da051ad586156d3c7dc341381abf08a3882cc363a518b2a

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