Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 df651fd93ce8c66f…

MALICIOUS

Office (OLE) / .XLS

207.5 KB Created: 2017-03-01 06:35:45 Authoring application: Microsoft Excel First seen: 2023-06-15
MD5: fa595637dcb1d0dbaa41e928b1e59064 SHA-1: 4026e47f240758aebd1590241671d43175c7a4e0 SHA-256: df651fd93ce8c66fa57678bf6e387865151d489c2f5ddbd79fe05af9314f4b53
330 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1105 Ingress Tool Transfer

The sample is a macro-enabled Excel file that contains AutoOpen and Auto_Open macros. These macros execute a VBA function that uses URLDownloadToFileA to download a file named 'version.dll' from 'https://ntc-govpk.servehttp.com/favicon.ico' and save it to the user's local appdata directory. This indicates a downloader pattern aiming to fetch and execute a second-stage payload.

Heuristics 9

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Exploit.Generic-6923078-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.Generic-6923078-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 https://ntc-govpk.servehttp.com/favicon.ico

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b7577256ac29d031aa1cc4ea039579a7f82179d919e144f116d71c119d801aae		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1906 bytes

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