Malicious RTF — malware analysis report

Static analysis result for SHA-256 e151a5a54a22c81d…

MALICIOUS

RTF

255.8 KB Created: 2019-08-06 01:42:00 First seen: 2020-04-06
MD5: 55e38855481c3dbcf8344f30b2549700 SHA-1: 865aef1f539753dfe3bfa6c64c5a241ffc85489a SHA-256: e151a5a54a22c81da693d09394209ac93d6502223e5450428780d9542df118cc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects and triggers the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload from the unknown URL.

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 https://thekukuaproject.com/0/doc.msi In RTF body
    • http://schemas.microsoft.com/office/word/2003/wIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000079f8.bin rtf-objdata-decoded RTF \objdata at offset 0x79F8 15892 bytes
SHA-256: 16bced11495d664e27c09011f586aaf8fc27f8f1157a217e0c6d24af2517236c

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