Malicious RTF — malware analysis report

Static analysis result for SHA-256 38229a586ffd9607…

MALICIOUS

RTF

6.00 MB Created: 2021-06-08 18:23:00 First seen: 2021-06-17
MD5: 8eb12f15bfb7e9f617afb3a9f396963d SHA-1: d349d02ba4a79ac29c4d5a4cc733eb03ada0e92e SHA-256: 38229a586ffd9607f0e9ace4568d367e80dbcc70722fca70ada9df6b6aec9fb0
322 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects and triggers critical heuristics for CVE-2017-8759, indicating exploitation of the Equation Editor vulnerability. The presence of a suspicious extracted artifact, 'objdata_00_off00374122.bin', suggests the execution of shellcode. The embedded URL 'https://bit.ly/3x4FIta' is likely used to download a secondary payload.

Heuristics 8

  • 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-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Suspicious extracted artifact critical 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.
  • \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
  • 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 http://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • https://bit.ly/3x4FItaIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00374122.bin rtf-objdata-decoded RTF \objdata at offset 0x374122 802004 bytes
SHA-256: f8644a95bc366a9c210e378fe1995769aa061fbbe645995f8edf154dd9ae3824
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://bit.ly/3x4FIta
objdata_01_off00374349.bin rtf-objdata-decoded RTF \objdata at offset 0x374349 63 bytes
SHA-256: 42d9af0323fb97aca6e24db96944bb9329e910997aef5ab319c3e8db0d113cfb

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