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

Static analysis result for SHA-256 790051c9d4abb07e…

MALICIOUS

Office (OLE) / .XLSX

38.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-08-16
MD5: 8a7129a4a07eaa7327f08f89baa5a4b0 SHA-1: 11b69fdbb82c42566bf8221bcf4c97b554099917 SHA-256: 790051c9d4abb07eaf104f3946dd8e068e41bbc0f14bdb0b174f75b66b16dd4e
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1036.005 Match Legitimate Name or Location

The Workbook_Open macro is designed to execute a batch file named 'Outlook.bat' in the user's public directory. This batch file is constructed using obfuscated strings and calls other batch scripts, likely to download and execute a second-stage payload. The use of Shell() and cmd.exe references, along with the auto-execution via Workbook_Open, strongly indicates a malicious downloader.

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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