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

Static analysis result for SHA-256 8fe23c29ba0570ad…

MALICIOUS

Office (OLE) / .XLSX

33.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-08-16
MD5: 1d5e697a9549b96a548a76b59eb4e64c SHA-1: 413e5fa05e80aa4d7cc13ffe22830f4afc9c0d2f SHA-256: 8fe23c29ba0570ad4b2fa152702380863429f97280d3ce26f4194e2593db45c2
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.002 Spearphishing Attachment T1027 Obfuscated Files or Information

The Workbook_Open macro is designed to execute a batch script that writes further commands to Outlook.bat and task.bat. The script uses obfuscated string concatenation to construct commands, likely to download and execute a second-stage payload. The use of Environ("Public") suggests an attempt to write to a common, user-writable directory.

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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