Malicious RTF — malware analysis report

Static analysis result for SHA-256 74951dbb45333775…

MALICIOUS

RTF

5.6 KB First seen: 2018-07-14
MD5: 736a33926ec829c6370fb84022dac346 SHA-1: beec315950960ef0009355217cb2ab733da27b4a SHA-256: 74951dbb45333775f8e70376dae4a83fbf5ef8beb7771937b112b9be735cf262
222 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data that leverages CVE-2017-0199 to automatically link and update an external resource. This mechanism is used to download and execute the putty.exe binary from the specified URL, indicating a likely initial access vector via spearphishing attachment.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 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://the.earth.li/~sgtatham/putty/latest/w32/putty.exeIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2602 bytes
SHA-256: dc688ab5d1591c9008b839e8b0275ff40f376c96bb16d4c1cd126323d1e0d8db

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