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

Static analysis result for SHA-256 63cbc873ef7319f1…

MALICIOUS

Office (OLE) / .XLS

80.5 KB Created: 2020-12-29 08:29:25 Authoring application: Microsoft Excel
MD5: 57ab36d2550149818cd00337f93dcb0e SHA-1: 0c978833a4c49c55c8421d8de2e05e2021708053 SHA-256: 63cbc873ef7319f1efba2c3360c84ea99b3198e5c709eb151386332fb2a09400
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Obfuscate Malicious Code T1071.001 Web Protocols

This Excel document contains a Workbook_Open macro that utilizes WScript.Shell to download and execute a second-stage payload. The macro's obfuscated nature and the presence of a 'Shell()' call strongly indicate a downloader or dropper functionality. The document also contains a lure to enable content, a common tactic for macro-based malware.

Heuristics 9

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
38d3948583dd5889c5fc914e9c0ddef7e083bdee145becf493268e03cccc4094		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 45500 bytes

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