Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d19d642c87ad85c6…

MALICIOUS

RTF / .DOC

435.1 KB
MD5: f3d86061648bd24723aa42ff54b6740a SHA-1: e4fb714b00c135caa75bc939a328f3b2b59205a2 SHA-256: d19d642c87ad85c6eefcd2a940e303b3f390f1d93c25e56a22ecc55fcfc53726
182 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1559.001 Component Object Model Hijacking: Component Object Model T1059.001 Command and Scripting Interpreter: PowerShell

The RTF document contains OLE object data and is associated with CVE-2017-11882, indicating exploitation of a known vulnerability in the Equation Editor. The heuristic firings strongly suggest that this document is designed to drop and execute a secondary payload via the Equation Editor vulnerability. The extracted OLE object data, with high entropy, further supports the presence of a malicious payload.

Heuristics 5

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 2 \objdata section(s) — embedded OLE objects
  • Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001934.bin
5a30b7f96517b785f4804c10dbfe9e888a28889d92035318b37f5a5200679ac1		 rtf-objdata-decoded RTF \objdata at offset 0x1934 219428 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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