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

Static analysis result for SHA-256 3da544127a388266…

MALICIOUS

Office (OLE) / .XLS

41.0 KB Created: 2023-08-28 11:27:25 Authoring application: Microsoft Excel First seen: 2023-08-29
MD5: 720bda028f8cce383a2b30edbd11d410 SHA-1: f738c200f155a3cc1cfae3e280cac23e0788f364 SHA-256: 3da544127a3882668f6535b6a8058d0c561ddaa70537253c13e536017861677b
328 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of VBA macros, specifically a Workbook_Open macro that utilizes the URLDownloadToFile API. This suggests the Excel file is designed to download and execute a secondary payload from a remote source. The ShellExecute API is also referenced, further supporting the execution of downloaded content.

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
e83f3ed63cbd1d4bcfd2e7591c7c66c655ca8218b8834ece4bd94770fe652777		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10837 bytes

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