Jaff — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 45bee6f6d25aaadd…

MALICIOUS

Office (OLE) / .DOC

109.5 KB Created: 2017-05-24 09:20:00 Authoring application: Microsoft Office Word First seen: 2022-02-21
MD5: 4b5152d069bd12f2ca5b7975da1ff6f5 SHA-1: 166c1dbdad7bfd067705ab3e7b9fc7f940e642f3 SHA-256: 45bee6f6d25aaadda925720f3ff2fc9e9bfafbdf35120f1730ba89b0aa9e5bd5
402 Risk Score

Malware Insights

Jaff · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The sample was detected as 'Doc.Downloader.Jaff-6329915-0' by ClamAV, indicating it is a downloader for the Jaff ransomware family. The presence of VBA macros, specifically an AutoOpen macro and CreateObject calls, strongly suggests malicious intent. The VBA script likely attempts to download and execute a second-stage payload, consistent with the Jaff family's known behavior.

Heuristics 11

  • ClamAV: Doc.Downloader.Jaff-6329915-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Jaff-6329915-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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.openxmlformats.org/drawingml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c7eb050e87c12f41221640b9335dfef45b62c3500a15e63859380b7026a1004c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 46223 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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