Xls.Dropper.Agent-7914575-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 723080f3083b8428…

MALICIOUS

Office (OLE) / .XLS

54.0 KB Created: 2020-05-25 05:37:18 Authoring application: Microsoft Excel
MD5: 1ae9543f4ed2eb11e16b3e38baacd989 SHA-1: ba363d8a6a176c6cd4ef398495954edcc2e65f75 SHA-256: 723080f3083b8428248cead3d4c3ad20883395e1d574f853bca15065d2217fad
300 Risk Score

Malware Insights

Xls.Dropper.Agent-7914575-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel spreadsheet containing obfuscated VBA macros, specifically a Workbook_Open auto-execution routine. This routine uses CreateObject and GetObject calls, indicative of attempting to launch external processes or scripts. The ClamAV detection name 'Xls.Dropper.Agent-7914575-0' and the heuristic 'Obfuscated auto-exec VBA loader' strongly suggest this file acts as a dropper for further malicious payloads.

Heuristics 7

  • 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-7914575-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7914575-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
e8eb16a6d7643f35c576be870fb4975525e923f81f8309d6e1244e4f035b87a7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9498 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.