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

Static analysis result for SHA-256 a128f8c49d87022a…

MALICIOUS

Office (OLE) / .XLSX

422.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2023-05-18
MD5: 7f34dd3bd892efe3f1073bcb90cb2c00 SHA-1: dc3c479d33770a6a0a15767a6dec6cd93e95a32d SHA-256: a128f8c49d87022ac9d6323d9f4801a4876c75fc5fecb1c3448ddf62e492b78a
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The Workbook_Open macro is configured to execute a Visual Basic script named 'socalled.vbs' using 'wscript'. This script likely downloads and executes a second-stage payload, as indicated by the Shell() call and references to PowerShell and WScript. The macro's execution of external scripts points to a downloader or dropper functionality.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bitbucket.org/mounmeinlylo/rikirollin/downloads/blackfriend.pif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
78cfc496c7674b16733854d07ab0bb2bd0444947dc5408eb40c80d7d0c89f122		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2104 bytes

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