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

Static analysis result for SHA-256 e78fb465f9767ae8…

MALICIOUS

Office (OLE) / .XLS

22.5 KB Created: 1996-10-08 23:32:33 Authoring application: Microsoft Excel First seen: 2022-09-13
MD5: d7c7e335350a4e33b54f9301de589781 SHA-1: 87d29d4eca74b9466ea442bedb75111eb2f53f99 SHA-256: e78fb465f9767ae897dd928714f2a329987e765259f5f66275128aa2d44ee6b5
300 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1059.001 PowerShell

The Workbook_Open macro executes a series of VBA functions that construct a URL and a save path. It then uses ADODB.Stream to write content from the Excel sheet to a file named 'servics.exe' in the %TEMP% directory. Finally, it executes this downloaded file using WScript.Shell, indicating a downloader or dropper functionality.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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
16cc9cc468013c8e1defef98763ab4c4b99c609ac59755868ba6e205d100001d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1998 bytes

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