Xls.Downloader.b83ac4c497e169b5-9980307-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 3e6d3492f0018c45…

MALICIOUS

Office (OLE) / .XLS

73.0 KB Created: 2022-12-20 09:55:23 First seen: 2022-12-20
MD5: 3e1f81eb9bad9a4843661aa367f39b62 SHA-1: d3a86408d326730002fd727da1792c95a6d73e3a SHA-256: 3e6d3492f0018c45fba1fd4045e66abf1becb971f17ee4773cec52eb71a17c02
288 Risk Score

Malware Insights

Xls.Downloader.b83ac4c497e169b5-9980307-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros that utilize WScript.Shell and CreateObject, indicating an attempt to execute arbitrary commands. The presence of a Shell() call strongly suggests the macro is designed to download and execute a secondary payload. The ClamAV detection name further supports its classification as a downloader.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Downloader.b83ac4c497e169b5-9980307-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.b83ac4c497e169b5-9980307-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3971fec43fd9256fef3de7cc73deab87b5f2252ca1607f7982a8a0a8340c79a7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4879 bytes

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