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

Static analysis result for SHA-256 5d96934dbe61c94c…

MALICIOUS

Office (OLE) / .XLS

284.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 490e9c885d338b6e47d0314bebaa2def SHA-1: f5637692cff78b6ac692836f1c5e9fd85bf72a8c SHA-256: 5d96934dbe61c94cb2ee5fd27a7d4c5dbbf8854037d1220d8c9ea311283aec43
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 macro that utilizes WScript.Shell to download and execute a second-stage payload. The critical heuristics indicate the use of Shell() and WScript.Shell, along with a direct download and execution of a file via HTTP. The obfuscated nature of the VBA code and the lack of specific indicators prevent confident family attribution.

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
3cc4c912440cd20096486a1a3981321dc10a840151526f830a1b6d2d63b2b3f0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 20273 bytes

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