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

Static analysis result for SHA-256 e46d810b92a54d8b…

MALICIOUS

Office (OLE) / .XLSX

33.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-08-16
MD5: 90512b064db1da60fb41f392c8cbb762 SHA-1: 9cd8187d0b2b1f7c8f0ce349ea2e49cbcbc41620 SHA-256: e46d810b92a54d8b1b0041ccda70476999d5c6e59398727cac8b83bd3fe4d9a6
208 Risk Score

Malware Insights

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

The Workbook_Open macro is designed to execute automatically when the spreadsheet is opened. It writes multiple batch files to the user's public directory, including 'Outlook.bat', 'task.bat', 'DefenderFile.bat', and 'KilFile.bat'. The script then proceeds to execute these batch files, which likely download and run a second-stage payload, indicated by the use of cmd.exe and the Shell() function.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • 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
9aae994c2e1c1317470f797f5379b50ed17f44f406e21538b812f3b5e27660ed		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5486 bytes

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