Xls.Dropper.Agent-8011535-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 6b307cbe4f1e8d76…

MALICIOUS

Office (OLE) / .XLS

34.0 KB Created: 2020-06-07 22:08:40 Authoring application: Microsoft Excel
MD5: 905aaa4a8eafed864b2591e366a9c2ee SHA-1: ffa0c30dc35a788cd296830c23f81281174a292d SHA-256: 6b307cbe4f1e8d769af95142d574e77a50654e25cce234f48da6c5e7a7aa4b99
420 Risk Score

Malware Insights

Xls.Dropper.Agent-8011535-0 · confidence 95%

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

This XLS file contains a Workbook_Open macro that is heavily obfuscated and uses CreateObject and Shell() calls via WScript.Shell. The ClamAV signature 'Xls.Dropper.Agent-8011535-0' and the critical heuristics for obfuscated auto-exec loaders and WScript.Shell usage strongly indicate a dropper functionality. The macro likely downloads and executes a second-stage payload, though the specific command is obfuscated.

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-8011535-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8011535-0
  • 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
8e34339f720016b950f9c03171589f048310e543abf914587ffeef90e0eccee1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2944 bytes

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