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

Static analysis result for SHA-256 d177f6ff7b8fc0dd…

MALICIOUS

Office (OLE) / .XLS

29.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-08-03
MD5: 30f3dcd747b1bcd2d37f1cf87f43fbae SHA-1: e89629231df0e5f3205e64fbdaa2558847a8b5ed SHA-256: d177f6ff7b8fc0ddcb4f16a5c501c2479b47733e350761d94d35a107a99e94cf
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1059.005 Visual Basic T1053.005 Scheduled Task

The Auto_Close VBA macro executes a shell command to copy a file named 'quietmoth.exe' from a network share to the local \\10.127.252.11\SHARE\ path. It then uses the Schedule.Service COM object to create a scheduled task named 'UpdateTask' that will execute the copied file C:\Windows\Temp\quiet.exe after a 30-second delay. This indicates a downloader or dropper functionality.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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
3450987f238fa11e8d0070c691f74532ca17b1494e846c1a48bfa1e1ef7d157c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1670 bytes

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