Malicious RTF — malware analysis report

Static analysis result for SHA-256 a58da0cd9a28c8d9…

MALICIOUS

RTF

9.9 KB First seen: 2020-02-04
MD5: 00f68c42ffe17b2e2bbf23168dc255c0 SHA-1: 01ec202dde88473314e92ea49349831c07034a20 SHA-256: a58da0cd9a28c8d9176e18544bb88e638c82f7840de498ac3b86d457f3a3bd43
182 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object and triggers heuristics related to Equation Editor exploits, specifically CVE-2017-11882. This indicates the file is designed to exploit a client-side vulnerability for code execution. The presence of the exploit suggests it was likely delivered as a spearphishing attachment.

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://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • http://bit.ly/2ynWBmLIn 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 3618 bytes
SHA-256: 2d5d58838cfd903288375491c3f5e9426610a64adbf5bb767e9d363ac11cf705

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