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

Static analysis result for SHA-256 5b596204d9e1d8c5…

MALICIOUS

Office (OLE) / .XLS

66.5 KB Created: 2021-03-16 13:12:43 Authoring application: Microsoft Excel
MD5: 3fc372974d1ea8158f40e7b89084a7f0 SHA-1: e35762ede9489866cb5b032eb77384447f49ec6f SHA-256: 5b596204d9e1d8c5717b1c02f4618e560ecca1ce69362064c5d3e2ae4c258c32
288 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The Excel file contains a Workbook_Open VBA macro that is designed to execute automatically when the workbook is opened. This macro utilizes the URLDownloadToFile API to download a second-stage payload from a remote location. The presence of a macro-enable lure in the document body further supports the malicious intent of this file.

Heuristics 8

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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
32575a3e047f1e4656fa6bd4d0df28351812d0457a8ca8460ab0a84613fbdf5f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14556 bytes

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