Malicious RTF — malware analysis report

Static analysis result for SHA-256 cb9a301d5ad170b4…

MALICIOUS

RTF

7.2 KB First seen: 2019-08-04
MD5: 13abfda163a336baef6319ff7c4ac7d2 SHA-1: d82cc33495fe2405afc77ee86356a77d5a480fce SHA-256: cb9a301d5ad170b4eae4a87a9a80daa23b44a79a67a9ca0cff5f7f63df9b283e
140 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and specifically triggers heuristics related to Equation Editor exploitation and OLE object activation. This indicates the file is designed to exploit a known vulnerability in Microsoft Equation Editor (CVE-2017-11882) to achieve arbitrary code execution. The embedded OLE object likely contains shellcode or a loader for a secondary payload.

Heuristics 4

  • 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
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000032.bin rtf-objdata-decoded RTF \objdata at offset 0x32 3634 bytes
SHA-256: 3d908bd75916d2cffdb55f96132cf1c15e030486ba58b8c1ba3a0fb5420d4177

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