Malicious RTF — malware analysis report

Static analysis result for SHA-256 15fb79ea94481869…

MALICIOUS

RTF

85.6 KB
MD5: 516d3bde3154fb8b8016cb97b9b4376a SHA-1: 258676e09c0fc8379e016f3a91980ebfba8e3035 SHA-256: 15fb79ea9448186905952f80cd41f2cc3b2003cd79259c036b5656738219e8e1
160 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 triggers the CVE-2017-11882 vulnerability. This vulnerability is known to be exploited for arbitrary code execution, likely to download and run a second-stage payload. The presence of the Equation Editor CLSID and the specific CVE firing strongly indicate this exploit.

Heuristics 4

  • 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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002381.bin
ac2236b0c83a0ce04f7313f8e31991e9454b34a1aa7ec2a80148d0a22cca1fa8		 rtf-objdata-decoded RTF \objdata at offset 0x2381 3631 bytes

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