Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f1406094b5aaea92…

MALICIOUS

Office (OLE)

708.0 KB Created: 2021-07-14 08:38:23 Authoring application: Microsoft Excel
MD5: 17740d73d9ddbd8d456916749e894e8e SHA-1: cf5a8d760c40882cd46f357b8bbf89a6474088bb SHA-256: f1406094b5aaea926ba2700a23f6c7924c1735b1c69cd5dd30fccae1cea72595
416 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.011 System Binary Proxy Execution: Rundll32

The sample is an Excel file containing a Workbook_Open VBA macro. This macro iterates through cells in Sheet1, concatenates their values into a string, and writes this string to a script file named 'qPrevious.sct' in the ALLUSERSPROFILE directory. It then uses WScript.Shell to execute this script file via mshta.exe. This indicates the file is designed to download and execute a second-stage payload.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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)
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3c78f84f1a5221b790e3256a113ffbb77930732e9b5b8b658d750d656a87de1c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1286 bytes

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