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

Static analysis result for SHA-256 51a60269cd9f235a…

MALICIOUS

Office (OLE) / .XLSX

33.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-08-16
MD5: 5697889766e4385824c686b931e751fb SHA-1: 24707eb5f1fccc64376493fd5fccb8deabe4ad11 SHA-256: 51a60269cd9f235a93ac58aca692e19058161c78531a1af3cb35a8051a373eca
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro is designed to execute a batch file, 'Outlook.bat', which in turn appears to download and execute a second-stage payload. The script also creates other batch files ('task.bat', 'DefenderFile.bat', 'KilFile.bat') in the Public directory, likely for staging or cleanup operations. The use of Shell() and cmd.exe references strongly indicates an attempt to run arbitrary commands.

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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