Malicious RTF — malware analysis report

Static analysis result for SHA-256 89c764a69a3b5364…

MALICIOUS

RTF

6.4 KB First seen: 2020-12-28
MD5: 8fcc1e9f3fa60de8c0530a7366ab79b3 SHA-1: 784dcba1b52241f8f033606053571a2c23581512 SHA-256: 89c764a69a3b536466c77f47c3bc56fb263444dae8dc220c3a06c4a0313ce964
180 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the CVE-2017-11882 vulnerability in Equation Editor. This exploit is designed to execute arbitrary code, likely as a payload delivered via spearphishing. The extracted artifact 'objdata_00_off000001c7.bin' is a strong indicator of this exploit's presence.

Heuristics 5

  • 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
  • CVE-2017-11882/0802 — suspicious Equation font record high CVE likely CVE_2017_11882
    RTF contains Equation Editor data with an anomalous MTEF font record shape. This is a static indicator for Equation Editor font-record overflow CVE families, stronger than CLSID presence.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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_off000001c7.bin rtf-objdata-decoded RTF \objdata at offset 0x1C7 3032 bytes
SHA-256: 55d4c78f5100a16da2bf6ff11b4dffebfc048766150b13ce892db1049d280d8f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: NOP sled Static shellcode analysis recovered command string(s): powershell.exe -noexit -windowstyle maximized