Xls.Dropper.Agent-7673662-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 f90d704f59ea37df…

MALICIOUS

Office (OLE) / .XLS

28.5 KB Created: 2020-04-16 14:32:24 Authoring application: Microsoft Excel
MD5: 1b99e91048273f7c5b8389a2a596e49e SHA-1: dc03964251a4aa03ee98f721d6352cd419f03ea1 SHA-256: f90d704f59ea37df01fe8b048f5af4507c38fee3db34829a209e2aa93a9667ea
200 Risk Score

Malware Insights

Xls.Dropper.Agent-7673662-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The critical ClamAV detection and high-severity heuristics indicate this is a malicious Excel file. Specifically, the presence of VBA macros, an Auto_Close macro, and a GetObject call strongly suggest it's a dropper. The Auto_Close macro is designed to execute automatically when the workbook is closed, likely initiating the download and execution of a secondary payload. The file's content is minimal and appears to be junk data, further supporting its role as a malicious container.

Heuristics 5

  • ClamAV: Xls.Dropper.Agent-7673662-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7673662-0
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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
d425e29d935f4c2d56df3304462a7053abcc2cf8bf141fe63244202a01e231d2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1087 bytes

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