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

Static analysis result for SHA-256 4ae704cde30c0dbc…

MALICIOUS

Office (OLE) / .XLS

135.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-07-29
MD5: 66ef00a65ea8c827b0743a402d5299b3 SHA-1: c3bd0dbe3b3e63f5daf2c6eb54caa7963aacbb4e SHA-256: 4ae704cde30c0dbc3b6ce5e44a5cfac34a2038b571ed1d2872fc1d48cdc58779
360 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the use of WScript.Shell, a common technique for executing commands. The OLE_VBA_HTTP_DROP_EXEC heuristic confirms that the VBA code downloads and writes a file to disk. The Workbook_Open macro is automatically executed upon opening the document, suggesting a downloader or initial execution vector.

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
692cc600e868c10fa80dd9c1b794d0b52d650a048226d5defe82257d0a653f79		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 25560 bytes

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