Malicious RTF — malware analysis report

Static analysis result for SHA-256 a83379b8b447917a…

MALICIOUS

RTF

262.8 KB Created: 2018-07-11 20:10:00 First seen: 2019-05-31
MD5: 084e31011e0711b99387755038c55f61 SHA-1: 5483ef09e4199de709b01d93a4a25ae5d192a347 SHA-256: a83379b8b447917ac005c5a43ce12961eeeafe87c1a448212473a00677b2f6f0
462 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-8759, a vulnerability in MSXML SAX OLE activation. This exploit is used to embed and execute OLE objects, including a PE header in hex data and a suspicious binary artifact identified by ClamAV as Win.Trojan.Autoit-7057866-1. The presence of shellcode indicators in the extracted artifact suggests it acts as a downloader for a secondary payload.

Heuristics 10

  • 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.
  • ClamAV: Win.Trojan.Autoit-7057866-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Autoit-7057866-1
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • 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 2 \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 http://www.ibsensoftware.com/ In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002a8d.bin rtf-objdata-decoded RTF \objdata at offset 0x2A8D 107755 bytes
SHA-256: e0241251b7495052f8fb09b1137475fe55fdcad12942a69f9530a7f66d9b2e23
Detection
ClamAV: Win.Trojan.Autoit-7057866-1
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, NOP sled, SC_STR_GETPROCADDRESS Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress
objdata_01_off00037cff.bin rtf-objdata-decoded RTF \objdata at offset 0x37CFF 3993 bytes
SHA-256: cea05cad9de0d612214f899016cb1de4c4f466eb89930ba74805bfac6cd5abce
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): cmd.exe /c%tmp%\bot.exe &��D$,f-Q���%

Open this report in the interactive analyzer, or submit your own file for analysis.