Xls.Dropper.Agent-7997012-0 — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 6f95416c1006a499…

MALICIOUS

Office (OLE) / .XLSX

34.5 KB Created: 2020-06-02 22:00:40 Authoring application: Microsoft Excel
MD5: a4093387c2877de87dd44f63d4be430e SHA-1: 4a6d5c729b7aaf28abd90f1e5fde493dcf964264 SHA-256: 6f95416c1006a499c7012c6cde49a27f83223c665cf9b28764030afeb04bf697
420 Risk Score

Malware Insights

Xls.Dropper.Agent-7997012-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing obfuscated VBA macros. The Workbook_Open event triggers the execution of this code, which uses CreateObject and Shell() calls via WScript.Shell to likely download and execute a second-stage payload. The ClamAV detection name further supports its classification as a dropper.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Xls.Dropper.Agent-7997012-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7997012-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d6ff90b124c2bb958160c75d1be6a8d0c3aab7f3051bdee94aff6cfe6ad858bd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3583 bytes

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