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

Static analysis result for SHA-256 75a5568c91850b83…

MALICIOUS

Office (OLE) / .XLS

192.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 31795aff2f438defa01c82368886353c SHA-1: 3f4c6dfa01693fea70f3113c11aeb5812b0c6cdb SHA-256: 75a5568c91850b8332bf8ac3d6a0acbe24a2bbb9a7941994709ba3cbaa255c5a
360 Risk Score

Malware Insights

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

The Excel file contains VBA macros that leverage WScript.Shell to download and execute a second-stage payload. The Workbook_Open event is triggered upon opening, initiating the malicious macro execution. This indicates a downloader or droppper functionality.

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
e53d9dd9c5cc1ddc4f6f968c13d292c4ba7ff83a15c6e70cb237723dfe428997		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7505 bytes

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