Malicious RTF — malware analysis report

Static analysis result for SHA-256 3822e819b09ae79b…

MALICIOUS

RTF

1.34 MB Created: 2019-01-07 23:54:00 First seen: 2019-12-10
MD5: 80addc811af0d796748ece51d22393cd SHA-1: 8680cf7e49aa0037f006fc1382fb6edeabe87e85 SHA-256: 3822e819b09ae79b8c5b4d2a9cca6456807d69ff6ead6a03cc4395a6da30b573
202 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects, with significant amounts of hex-encoded data within \objdata sections. The presence of \objupdate directives strongly suggests that these embedded objects are designed to be activated, likely to execute a hidden payload. The extracted artifact objdata_00_off00002438.bin, which contains shellcode command strings and VBA auto-execution terms, further supports this assessment.

Heuristics 7

  • \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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1082KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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 6 \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://github.com/VBA-tools/VBA-JSON In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • http://www.opensource.org/licenses/mit-license.php)�In RTF body
    • http://code.google.com/p/vba-json/�������In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002438.bin rtf-objdata-decoded RTF \objdata at offset 0x2438 134702 bytes
SHA-256: ed3dc298684ac8139afb23939350d0124bf702dd32be5469320bee4799e1d775
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): cScript Code:=Code� Carved macro source contains an auto-exec entry point and execution/download terms.
objdata_05_off0014d3f8.bin rtf-objdata-decoded RTF \objdata at offset 0x14D3F8 6502 bytes
SHA-256: 4d78aaeea748a71dcb0130caf1f2c86d1f67ede8256319ad5cd481b642f10cad

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