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

Static analysis result for SHA-256 dbdd12737909e4c0…

MALICIOUS

Office (OLE) / .XLS

131.5 KB Created: 2023-03-16 04:23:39 Authoring application: Microsoft Excel First seen: 2023-08-30
MD5: 3815ca81d6f85aa652ca08b46bdaa508 SHA-1: f669d3750c595934903e3549884eaf98b0e00cdd SHA-256: dbdd12737909e4c02577efeb4442dc106915ad6129c287c7decf8782f7a6d214
370 Risk Score

Malware Insights

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

The sample is a macro-enabled Excel file that contains AutoOpen and Document_Open macros. These macros call a function that uses the URLDownloadToFile API to download a file named 'version.dll' from 'https://finance-govpk.servehttp.com/favicon.ico' and save it to the user's local appdata directory. This indicates a downloader or droppper functionality.

Heuristics 10

  • 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
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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://finance-govpk.servehttp.com/favicon.ico

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1a1054f555f1495a72dfc7b4213042d3bd68c58af12e6dc63d93d2f6f3f248a6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2020 bytes

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