Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 85dca73c1b2716a7…

MALICIOUS

Office (OLE) / .XLSX

88.5 KB Created: 2022-02-14 05:58:53 Authoring application: Microsoft Excel First seen: 2022-02-22
MD5: 3052d1815a8fb462d12e5f921fb45d7a SHA-1: b117b81493d5f1dae5ae12ad4ecc84bff3421590 SHA-256: 85dca73c1b2716a70e661b3979df8c61bdf10273e21272e980c492a7c254bcef
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains a Workbook_Open VBA macro that utilizes CreateObject to execute a Windows Script Host command. This script is designed to download and save a VBScript file to 'c:\programdata\bbiwjdf.vbs' and then execute it. The downloaded script appears to be a downloader for a second-stage payload, as indicated by the obfuscated PowerShell command it attempts to run.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet02220-9940037-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet02220-9940037-0
  • 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
98ce64e756a4ee3d4f776c1541f7f3ad0f966d786db88eda74f9a833f3a74b83		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 11705 bytes

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