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

Static analysis result for SHA-256 28acc2c366be7e05…

MALICIOUS

Office (OLE) / .XLS

73.0 KB Created: 2021-03-07 20:00:53 Authoring application: Microsoft Excel
MD5: 521fd6d2199aa0b406b9665eb6fa0246 SHA-1: 566281d67a38e764643b82d562e4164292167bfd SHA-256: 28acc2c366be7e05e2be2282dc6c38e241fdcb3d603bde37258584ebbf34c9bc
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the presence of VBA macros that utilize WScript.Shell to execute commands. The OLE_VBA_PCODE_AUTOEXEC_EXEC heuristic specifically points to a Workbook_Open auto-execution event triggering a Shell command. This strongly suggests the macro is designed to download and execute a secondary payload upon opening the spreadsheet.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0c39911cd124469c2c3376300dd73603e00e954ff280175787f69e87180ff353		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 15216 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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