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

Static analysis result for SHA-256 c266edfc6f88ae94…

MALICIOUS

Office (OLE) / .XLSX

38.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-08-16
MD5: de2c9786c5c38ea021531158217e9737 SHA-1: 5377de8a45c1b00529a68263ca30d13bbd649071 SHA-256: c266edfc6f88ae947285fae438eae0e46b8bf059badf283db6d34d93c63df803
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 create and execute a batch file named 'Outlook.bat' in the public user directory. This batch file appears to be responsible for downloading and executing a second-stage payload from a hardcoded, albeit obfuscated, URL. The use of Shell() calls and cmd.exe references within the VBA code strongly indicates a malicious intent to download and run further malicious content.

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
739b12d04dae2bb2ffa2c4acdc262e94eeb6301ea8ea956475b73a21114bd6ed		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2313 bytes

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