Malicious RTF — malware analysis report

Static analysis result for SHA-256 0be8fb816628f707…

MALICIOUS

RTF

947.0 KB Created: 2016-07-27 13:27:00 First seen: 2016-08-15
MD5: 953ced18711ffbece6f765b187e5f634 SHA-1: c7798a9a8ebefdd6da81b9b041c37dd64cfc1174 SHA-256: 0be8fb816628f707f9325d5453147d7b8586dec7b8dace521016e6db5d76093d
284 Risk Score

Malware Insights

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

The RTF file contains multiple OLE objects and exhibits high-risk heuristics related to URL monikers, indicating an attempt to embed and execute external content. Specifically, the 'RTF_INCLUDE_REMOTE' heuristic points to the URL http://www.tx-wedding.com/asia/ as a target for remote content inclusion. ClamAV detections further confirm its malicious nature, identifying it as a dropper and exploit. The embedded OLE objects and remote URL suggest the file's primary purpose is to download and execute a second-stage payload.

Heuristics 8

  • URL Moniker in RTF OLE object high CVE related RTF_URL_MONIKER_RELATED
    RTF contains a URL Moniker GUID in OLE object context, but no decoded remote target was confirmed. Treat as related OLE2Link attack-surface evidence rather than proof of CVE-2017-0199 exploitation.
  • 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.
  • ClamAV: Doc.Dropper.Agent-6587549-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6587549-0
  • 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 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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.
  • 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://www.pcacases.com/web/view/7 In RTF body
    • http://www.tx-wedding.com/asia/In RTF body
    • http://www.cfr.org/global/global-conflict-tracker/p32137In RTF body
    • https://news.usni.org/2014/06/17/document-conduct-unplanned-encounters-seaIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • https://news.usni.org/2014/06/17/document-conduct-unplanned-encounIn RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00013f51.bin rtf-objdata-decoded RTF \objdata at offset 0x13F51 45 bytes
SHA-256: 083c2e8b44386e792363878581e7e6cc02382e07194162f33517c429dfbcec43
objdata_01_off00014922.bin rtf-objdata-decoded RTF \objdata at offset 0x14922 409649 bytes
SHA-256: 21429ec262ecc77e5ed7f0140b29053d97f65a84ddb660966f148044c1b59566
Detection
ClamAV: Doc.Dropper.Agent-6587549-0
Obfuscation or payload: likely
Carved artifact entropy is 7.86, consistent with packed or encrypted content.
objdata_02_off000defaa.bin rtf-objdata-decoded RTF \objdata at offset 0xDEFAA 16433 bytes
SHA-256: ac8397211c1cd7886d49ccd99d0163edaa3711f18fc40ff269159d175e9e4c47
Detection
ClamAV: Doc.Exploit.CVE_2015_1641-6397417-0
Obfuscation or payload: unlikely

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