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

Static analysis result for SHA-256 d18da0b1f7b0bf45…

MALICIOUS

Office (OLE) / .XLS

144.0 KB Created: 2023-04-11 10:47:31 Authoring application: Microsoft Excel First seen: 2023-04-11
MD5: 5f83c5aba3cf9c14bdb1c379ec09bfd5 SHA-1: 574c34b1918487d3d9bb470b6af659d9636806d2 SHA-256: d18da0b1f7b0bf45b6ef60315797eb8f9861badc405a2e9a5a7a2f9ba85f8378
328 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The critical heuristic OLE_VBA_DOWNLOAD indicates the use of URLDownloadToFile within VBA, and the Workbook_Open macro (OLE_VBA_WBOPEN) suggests automatic execution upon opening. The ShellExecute API reference (SC_STR_SHELLEXEC) further supports the execution of downloaded content. No specific family could be identified, but the behavior is consistent with a macro-based downloader.

Heuristics 8

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Xls.Malware.Valyria-10028013-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-10028013-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
baff6c0983ba6436da965816d0722ecbaeb9a4328dec1a241e47b44a0dc91a6e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 23725 bytes

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