Malicious RTF — malware analysis report

Static analysis result for SHA-256 0019a251ccfdcfeb…

MALICIOUS

RTF

255.8 KB Created: 2019-08-06 01:42:00
MD5: 3afa981a4ec6c381b5fa9fe50d8a19a0 SHA-1: 76122c99a66001235ecaad810573c002f1bbbc3a SHA-256: 0019a251ccfdcfeb9d7b67d6a7c490d093d6135b7dc8ef597f80771ff9f010d7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains multiple indicators of malicious activity, including OLE object data and embedded OLE objects. Critically, it fires a critical heuristic for CVE-2017-11882, indicating exploitation of a known vulnerability in the Equation Editor. The file also contains an embedded URL, http://s251199.smrtp.ru/q/dar.msi, which is likely the second-stage payload.

Heuristics 5

  • 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.
  • \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 3 \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://s251199.smrtp.ru/q/dar.msi
    • http://schemas.microsoft.com/office/word/2003/w

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000079f0.bin
0f805b0979482a767f58837d5dc2d64404705d21ed12599310c015a775e3d8d9		 rtf-objdata-decoded RTF \objdata at offset 0x79F0 15892 bytes

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