Malicious RTF — malware analysis report

Static analysis result for SHA-256 05059fffbbcf751f…

MALICIOUS

RTF

235.4 KB Created: 2021-02-12 04:30:00
MD5: 81f3bceb8974c4b1f041da44284dc3c8 SHA-1: d675ff8a3b6555dc7a6b383305a2e17c9b31220f SHA-256: 05059fffbbcf751f5616551ef94eea1195ebc37d6c95bca7fd90722c8547626b
262 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in the Equation Editor. This exploit is known to download and execute a second-stage payload. The document body content appears to be a list of schools, likely a lure to disguise the malicious nature of the file.

Heuristics 7

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • Equation Editor CLSID critical 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_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • \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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000106.bin
6f2546660c8101ee0d9e665b909f246ad752d2bccf8a495e5f3cd8f35d9fe6fe		 rtf-objdata-decoded RTF \objdata at offset 0x106 3628 bytes

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