Xls.Dropper.Agent-7697057-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 663330efa3c4a758…

MALICIOUS

Office (OLE) / .XLS

85.0 KB Created: 2020-04-26 22:37:18 Authoring application: Microsoft Excel
MD5: dd7989d4ff8cfb333dd0a980fa339ca0 SHA-1: adeaf35131bf45d1b10fc3140c28ee8382ffaca6 SHA-256: 663330efa3c4a758597fe771670cd24e8b020080aec3c460a26204a3b7bee561
260 Risk Score

Malware Insights

Xls.Dropper.Agent-7697057-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The file is an Excel spreadsheet containing obfuscated VBA macros, specifically a Workbook_Open auto-execution routine. The macros utilize CreateObject and string concatenation to construct and execute commands, indicating a dropper functionality. The ClamAV detection name 'Xls.Dropper.Agent-7697057-0' further supports this assessment.

Heuristics 6

  • 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-7697057-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7697057-0
  • 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
c0905dfb7ee517451fb9913e34b766c9bc88c053b737cd1767ae7dbe0ae812db		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3940 bytes

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