Malicious RTF — malware analysis report

Static analysis result for SHA-256 1422cb4fa12c1344…

MALICIOUS

RTF

97.8 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-09-30
MD5: 2062853b739cdcc4b46518f04584bd43 SHA-1: 1f99e80a947c232e01fa0c4848262420175ddce2 SHA-256: 1422cb4fa12c1344cfd8920d1adb269742462b1a7f0e3061c3cb415cc627672b
302 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE objects that leverage CVE-2017-0199 or CVE-2017-8759 to load a remote resource. The embedded URL points to 'http://localhost/t.php?stats=send&thread=0', which is likely intended to download and execute a secondary payload. ClamAV also detected this file as a downloader.

Heuristics 8

  • CVE-2017-0199 / CVE-2017-8759 (OLE2Link auto-activated remote loader) critical CVE related RTF_OLE2LINK_REMOTE_MONIKER_LOADER
    RTF embeds an OLE2Link object that is force-activated with \objupdate (no user interaction on open) and fetches a remote second stage — through an INCLUDETEXT/INCLUDEPICTURE field or the OLE object's own moniker. This is the OLE2Link auto-update attack path shared by CVE-2017-0199 (server returns an HTA/scriptlet) and CVE-2017-8759 (server returns a SOAP WSDL the .NET parser compiles). Office processes the fetched response through the same code path; the specific CVE depends on the now-unreachable server content type.
  • ClamAV: Rtf.Downloader.CVE_2017-6336326-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Downloader.CVE_2017-6336326-3
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • \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.
  • INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE
    RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
  • 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://localhost/t.php?stats=send&thread=0 In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00004a2c.bin rtf-objdata-decoded RTF \objdata at offset 0x4A2C 2598 bytes
SHA-256: 11601ba0f5e62babc43e3dd76cd392b86547b91ac38517aeec2b967b288caf29
objdata_01_off0000615a.bin rtf-objdata-decoded RTF \objdata at offset 0x615A 2723 bytes
SHA-256: 6198c3d556447659345dcc52218a97045cd7489a6656373d62782c98761b3a8d

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