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

Static analysis result for SHA-256 03cf03d1cb4fa502…

MALICIOUS

Office (OLE) / .XLS

330.0 KB Created: 2021-01-21 18:55:21 Authoring application: Microsoft Excel
MD5: 9f32ff59ea65adff3fa4350db7db6534 SHA-1: fa29ea0f3c997ef85c9fbd0a3f27d57344f15dd1 SHA-256: 03cf03d1cb4fa502ef1992e2aad3f1f7f0d7fbf1f16839d87eaa04f330211bbe
360 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

This Excel file contains a Workbook_Open VBA macro that leverages WScript.Shell to download and execute a second-stage payload. The critical heuristics OLE_VBA_SHELL, OLE_VBA_WSCRIPT, and OLE_VBA_HTTP_DROP_EXEC strongly indicate this malicious behavior. The macro's primary function appears to be facilitating the execution of external code.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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.
  • 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
bc5cdf6f743e6ed63c07e7846cddb750e3f086619a9dde65f81ed1da9fc8bfb9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 15115 bytes

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